Laser Accessories Overvie...09 LBM 011 09 LBM 013 09 LBM 015 09 LBM 017 75.0 92.0 117.5 162.5 169 fD...

47.2 1 Visit Us OnLine! www.mellesgriot.com

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Laser AccessoriesOverview

09 LBX series standard laser beam expanders

09 LBM series precision laser beam expanders

09 LAM series accessory adapters

09 LBC series compact beam expanders

09 LSL series focusing optics

09 LSP series pinholes

09 LCM seriescollimators

09 LSF 011 spatial filter

09 LAM series accessory adapters

09 LBV 001 zoom beam expander

compact self contained HeNe lasers

small diameter cylindrical HeNe lasers

cylindrical HeNe lasers

09 LBZ series large-aperture beam expanders

09 LAR 00309 LAR 005

09 LAR 001

argon-ion, YAG, orblue HeCd lasers

09 LLG 001laser linegenerator

The chart below shows how these products can be used. Pleasecontact a Melles Griot applications engineer for assistance withyour special requirements.

Melles Griot offers a wide range of laser accessories. From cylin-drical laser holders, adaptors, and alignment components to opticand fiber-optic assemblies, this family of laser accessories is designedto ensure that you get the most from your laser.

Chpt. 47 Final 8/27/99 11:50 AM Page 47.2

Visit Us Online! www.mellesgriot.com 1 47.3

Introductionto Lasers

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Standard Laser Beam ExpandersMany applications of helium neon and other visible lasersrequire the beam to be expanded for uniform illumination of alarge area. Melles Griot has developed this cost-effective rangeof beam expanders that are guaranteed to produce 1l or less ofpeak-to-peak wavefront distortion.

$ Cost-effective and ideal for illuminating a large area

$ Designed for broadband applications from 450 to 750 nm

$ Expansion ratios to 20! with 1l (peak to peak) or less ofwavefront distortion

$ Far-field focusing adjustable from 3 m to infinity.

$ Direct mounting onto any Melles Griot 44.5 mm diametercylindrical helium neon laser head with 4–40 on 36 mmbolt pattern

$ Adaptor ring product number 09 LAR 001 included(see page 47.16).

dimensions in mm

mounting ring focusing ring

B

threaded 1-inch–32 TPI expander lens collimating lens system

f27 fD fA

thread ID M33 x 0.52.0 mm depth on 09 LBX 001 only

PRODUCTNUMBER fA B09 LBX 00109 LBX 00309 LBX 005 47

3938

136 83 50

fD

33.325.012.0

09 LBX standard laser beam expanders (09 LAR 001 adaptor ring included)

Standard Laser Beam Expanders

Expansion

Ratio

Exit Aperture

(mm)

Minimum Focus

Distance (m)PRODUCT

NUMBER

5!

10!

20!

5.0

10.0

20.0

3

3

3

09 LBX 001

09 LBX 003

09 LBX 005

SPECIFICATIONS: STANDARD LASER BEAM EXPANDERS

Wavelength Range: 450–750 nm

Recommended Maximum 1/e2 Beam Diameter: 1.0 mm

Input Aperture: 2.5-mm diameter

Wavefront Distortion: <1l (p-p) at 632.8 nm

Transmission: >95%

Coating: HEBBAR™ /078 (See Chapter 5, Optical Coatings)

Housing Material: Black-anodized aluminum

Mounting: 1 inch–32 TPI

Laser Beam Expanders

Available in:✔ Production Quantities✔ Custom Sizes



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f27

5

9.5B (varies with focal setting)

focusing ring

threaded1-inch–32 TPI

expander lens collimating lens system

fDf44

NUMBER PRODUCT

min09 LBM 01109 LBM 01309 LBM 01509 LBM 017

75.0 92.0117.5162.5 169

fD

124 99 82

max10102030

B

dimensions in mm

09 LBM precision laser beam expanders

Precision Laser Beam Expanders

Expansion

Ratio

Exit

Aperture

Minimum Focus

Distance (m)PRODUCT

NUMBER

3!

10!

20!

30!

3.0

10.0

20.0

30.0

3

3

5

10

09 LBM 011

09 LBM 013

09 LBM 015

09 LBM 017

SPECIFICATIONS: PRECISION LASER BEAM EXPANDERS


Recommended Maximum 1/e2 Beam Diameter: 1.0 mm

Input Aperture: 2.5-mm diameter

Wavefront Distortion: <l/4 (p-p) at 632.8 nm

Transmission: >95%

Coating: HEBBAR™ /078 (see Chapter 5, Optical Coatings)


Mounting: 1 inch–32 TPI

Precision Laser Beam ExpandersMelles Griot precision laser beam expanders produce peak-to-

peak wavefront distortion of less than l/4 in expansion ratios of3!, 10!, 20!, or 30!. The Galilean design shortens overalllength and improves performance by minimizing spherical aber-ration. A padded hardwood box is included for safe storage.

$ Larger output beams with reduced beam divergence for holographic and other distant illumination applications

$ Available for broadband applications from 450 to 750 nm

$ Optimized for 1-mm-diameter input beams

$ Far-field focusing from 3 m to infinity

$ Directly mounts to 09 LAM 001 or 003 series adjustablealignment adaptors see page 47.16.




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59.5 12.7 3.8

59.4L

threaded 1-inch–32 TPI

f22f31.7

f39.1f27

f22.22f39.1

C-mount adapter

dimensions in mm

09 LBZ argon-ion and Nd:YAG laser beam expanders

SPECIFICATIONS:ND:YAG AND ARGON-ION LASER BEAM EXPANDER

Wavefront Distortion: <l/4 (p-p) at 632.8 nm Coating: HEBBAR™ /078 (see Chapter 5, Optical Coatings)Housing Material: Black-anodized aluminumMounting: 1-inch–32 TPI, female

1-inch–32 TPI male with C-mount adapter (included)

Nd:YAG and Argon-Ion Laser BeamExpanders

These beam expanders can be used with blue HeCd, argon-ion,krypton argon ion, Nd:YAG, and frequency-doubled Nd:YAG.

$ Broadband multilayer dielectric coatings for visible or near-infrared laser wavelength

$ Compatible with high-power laser systems (see damage-threshold table)

$ Post mounting achievable with the 07 HLM 001 C-mountholder (see page 47.16). Test Wavelength Pulsed CW

Visible (at 532 nm)

Near-IR (at 1064 nm)3.8 J/cm2 in 13 ns

6.5 J/cm2 in 20 ns

70 kW/cm2

—

Nd:YAG and Argon-Ion Laser Beam ExpandersDamage Threshold

Note: There is no implied warranty.

*For diffraction-limited output. **Length at 1064 nm.

Expansion Ratio

Input Aperture

(mm)

Exit Aperture

(mm)

Length L**

(mm)Minimum Focus Distance

(m)

PRODUCT

NUMBER

Visible: 532 nm

3!

6!

10!

Near-IR:1064 nm

3!

6!

10!

7.32

3.96

2.50

7.32

3.96

2.50

22.0

22.0

22.0

22.0

22.0

22.0

135.0

135.0

169.0

135.0

135.0

169.0

1.5

2.1

2.5

2.0

2.3

2.5

09 LBZ 001

09 LBZ 003

09 LBZ 010

09 LBZ 101

09 LBZ 103

09 LBZ 110

Nd:Yag and Argon-Ion Laser Beam Expanders

Maximum Input Beam*

1/e2 (mm)

4.83

2.41

2.20

4.83

2.41

2.20

Chpt. 47 Final 8/27/99 11:50 AM 7.5


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Zoom Beam ExpanderThe Melles Griot zoom beam expander is ideal for visible,

near-IR, and tunable sources. The focus ring is used to collimate theinput beam, and the zoom ring then allows adjustment of the outputbeam diameter, from 2.5! to 10!.$ Broadband multilayer antireflection coatings from 540 to 750 nm$ Variable laser beam expansion ratio from 2.5! to 10!,

at 632.8 nm$ Focus range: 2.0 m to infinity.$ Wavefront distortion: <l/10 (rms) at 632.8 nm$ Mounting options: 07 HBZ 001 mounting stand,

09 LAM 001 and 003 adjustable adaptors, and 09 LAR 001fixed adaptor ring.

SPECIFICATIONS: ZOOM BEAM EXPANDER

Beam Expansion Range: 2.5!–10!, at 632.8 nm


Recommended Input Beam Diameter (1/e2): ≤1.5 mm

Input Aperture: f4 mm

Exit Aperture: f25.6 mm

Wavefront Distortion: <l/10 (rms) at 632.8 mm

Transmission: >95% at 632.8 nm

Coating: Broadband multilayer antireflection

Minimum Focus Distance: 2.0 m


Mounting: 1-inch-32 TPI (male), M6 (female)

Weight: 1.0 kg (2.2 lb)

215

f25.6 f60f27

focus ring

focus locking set screw

zoom ring

zoom locking knob

threaded 1-inch–32 TPI

100

9.5

51 hole threaded M6

dimensions in mm

09 LBV zoom beam expander

Zoom Beam Expander

Zoom Beam Expander Mounting StandExpansion

Ratio

Input

Aperture

(mm)

Minimum

Focus

Distance (m)

PRODUCT

NUMBER

2.5!–10! 4 2.0 09 LBV 001

Exit

Aperture

(mm)

25.6 Mounting

PRODUCT

NUMBER

Compatible with inch and metric hole patterns 07 HBZ 001Note: The zoom beam expander is shown above with optional 07 HBZ 001mounting stand.




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ccessories09 LBX 001

09 LLG 001

OEM Compact Beam ExpandersThese compact beam expanders are ideal for OEM applica-

tions. The wavefront distortion is less than l/2 (peak to peak) at 632.8nm, and these beam expanders can be mounted directly to anyMelles Griot 44.5-mm-diameter cylindrical helium neon laser head.

$ The mounting flange provides integral Y and Z translation, aswell as minor angular adjustment.

$ Focus adjustment is accomplished by rotating the focusingbarrel.

$ Set screws lock focus adjustment permanently in place afteradjustment is made.

$ Diffraction-limited spot sizes (1/e2 points) are < 1.1 mm for4! and < 0.57 mm for 8!.

$ Optics are MgF2 antireflection coated for the visible.

Laser Line GeneratorLaser line generators are ideal for measurement, alignment, and

visual-inspection applications.

$ They can be mounted directly to the focusable 09 LBX 001beam expander for line-width optimization from 3 m to infinity.

$ They can be used with the entire range of 44.5-mm-diametercylindrical helium neon laser heads.

$ The adjustable aperture creates a finer edge line.

$ Line axis can be controlled by manually rotating the internallens element and locking it in place.

4 holes f3 thrucounterboredf4.8 ! 3 deep

4 holes threaded 10-32 thruon 36 circle

max: 57.9

22.230.2

16.6

f7

44.1

dimensions in mm

focusing barrel

M3 nylon-tip set screw

M3 hex head screw

f6 rod lens

M33 x 0.5

2.8 19

f38

dimensions in mm

d

Dlaser head

line projector

L

aSPECIFICATIONSfan half angle (a): 26.5°working distance (L): 1 mline length (D): 500 mm

Input Beam Diameter (1/e2) mm Line Width (d) mm

0.75

0.80

1.02

1.080.2

1.080.2

1.080.2

09 LBC OEM compact beam expanders

09 LLG laser line generator

OEM Compact Beam Expanders

Expansion

Ratio

Input

Aperture

(mm)

Minimum

Focus

Distance (m)PRODUCT

NUMBER

4!

8!

2.5

2.5

0.6

0.609 LBC 001

09 LBC 003

Exit

Aperture

(mm)

7.0

7.0 PRODUCT NUMBER

Laser Line Generator 09 LLG 001

Laser line generator working parameters



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Melles Griot offers a selection of unmounted lenses designed foruse in a Keplerian telescope configuration (two positive lenses anda real, internal image). These beam-expander lenses are availablein four expansion ratios: 5!, 10!, 20!, and 50!. The first threeexpanders are made up of an input lens and an output lens. The 50!expansion ratio uses a different input lens and an air-spaced outputdoublet.

SPECIFICATIONS: UNMOUNTED BEAM-EXPANDER LENSES

Back Focal Length (fb): ± 0.5%

Useful Wavelength Range:5!, 10!, and 20!: 488–950 nm; 50!: 600–950 nm

Surface Accuracy: 2l at 632.8 nm over 90% of diameter

Centration: 3 arc min

Diameter Tolerance: +0.0, 50.1 mm

Maximum Entrance Pupil Diameter: 2.0 mm

Edge Thickness Tolerance: ±0.2 mm

Surface Quality: 40–20 scratch and dig

Antireflection Coating:Single-layer MgF2 (/066) all surfaces

01 LBX unmounted beam-expander lenses

f1f2Dout

te2

output lensinput lens

te1

fb

Din

B

Unmounted Beam-Expander Lenses

Expansion

Ratio

Input Lens

f1 fb te1(mm) (mm) (mm)

Output Lens

f2 te2(mm) (mm)

Lens

Separation

B

(mm)

PRODUCT

NUMBER

5!

10!

20!

50!

5.1

5.1

5.1

7.1

9.5

9.5

9.5

46.6

1.1

1.1

1.1

2.9

17.0

32.0

62.2

111.8

2.2

3.8

2.7

*

59.3

109.7

214.5

274.0

01 LBX 001

01 LBX 003

01 LBX 005

01 LBX 007

*This lens is a mounted air-spaced doublet.

UnmountedBeam-Expander Lenses


BEAM-EXPANDER LENS SET

A convenient beam-expander set is available, whichincludes one input lens and the 5!, 10!, and 20!output lenses.

Description PRODUCT NUMBER

5! – 20! Expander Set 01 LBX 011

Unmounted Beam-Expander Lens Sets




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Laser Collimators

Melles Griot 25-mm and 50-mm-aperture laser collimators pro-vide diffraction-limited performance with wavefront distortion ofless than l/8 (peak to peak) over 90% of full aperture. The broad-band design, optimized from 488 nm to 633 nm, provides adjustablefocus from 2 m to infinity.

The 09 LCM series laser collimators provide a highly collimatedoutput beam when used with the Melles Griot 09 LSF 011 spatialfilters at full aperture (see page 47-10). The output beam divergencefrom a 50-mm collimator is only 0.016 mrad at 632.8 nm. A male1-inch 32-TPI thread enables direct mounting to the 09 LSF 011spatial filter.

SPECIFICATIONS: LASER COLLIMATORS

Wavelength Range: 450–750 nm*

Focusing Range: 2 m to infinity

Wavefront Distortion: <l/8 at 632.8 nm (rms)

Coating: HEBBAR™ /078 (see Chapter 5, Optical Coatings)

Housing Material: Black anodized aluminum

Mounting: 1-inch–32 TPI

Note: This product must be used in conjunction with a Melles Griotspatial filter (see page 47.10).

*Contact your nearest Melles Griot office for additional wavelengthranges.

f25

f44.45

92.76


dimensions in mm

09 LCM 011 laser collimator

Laser Collimators

Maximum Output

Beam Diameter

(mm)

Focal

Length

(mm)

Minimum

f-number

PRODUCT

NUMBER

25.0

50.0

101.5

209.8

4.1

4.5

09 LCM 011

09 LCM 013


218.1

f44.3 f67.0

f50

dimensions in mm

09 LCM 013 laser collimator



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SPATIAL FILTER ASSEMBLY

This modular assembly holds an interchangeable focusing optic(09 LSL series) and precision mounted pinhole (09 LSP series),which are available separately and described on page 47.11.

The spatial filter assembly, made of black anodized aluminum,enables:

$ Easy and precise positioning of a pinhole at the center of thefocused beam, with 6 mm adjustment in the Y and Z axis

$ Precise focusing of a laser beam onto the pinhole plane formaximum transmission

$ Easy mounting to laser heads and collimating optics

$ Supplied in a protective storage box that will also hold up tofive focusing optics and pinholes.

Melles Griot offers additional spatial filter assemblies in Chapter 29, Microscope Components, Spatial Filters and Apertures.

Spatial Filter

SELECTING A SPATIAL FILTER/COLLIMATOR COMBINATION

1. Determine the desired collimated output beamdiameter.

2. Knowing the input laser beam diameter, use thegraphs above to determine whether a 25-mm or50-mm collimator is needed.

3. Use the graphs to determine the focal length of theinput focusing lens for the desired output beamdiameter.

4. Select a pinhole from the selection chart on thefollowing page.

5. Use an 09 LAM 001 adjustable accessory adaptor toalign the spatial filter assembly with the beam toensure proper beam centration.

focus ringM6 threadedpost adapter


11.09.5

91.4

focusing optic09 LSL

pinhole assembly09 LSP

2 axis pinhole adjustment knobs 90° apart

19.05

f27

f63.2

dimensions in mm

09 LSF 011 spatial filter (focusing optic and pinhole assemblyavailable separately)

Spatial Filters

PRODUCT NUMBER

Spatial Filter (includes hardwood storage box) 09 LSF 011

2.0

.2

INPUT BEAM DIAMETER (mm)

4.06.08.0

10.0

20.025.0

.4 .6 .8 1.0 2.0 3.0 4.0

4-mm fo

cal length 25.3!

6-mm fo

cal length 16.9!

8-mm fo

cal length 12.7!

12-mm fo

cal length 8.4!

16-mm fo

cal length 6.3!

09 LCM 011

OU

TPU

T B

EAM

DIA

MET

ER (

mm

)

6.010.0

20.030.050.0

4.0

2.0

4-mm focal length 56.8!





09 LCM 013

.2

INPUT BEAM DIAMETER (mm)

.4 .6 .8 1.0 2.0 3.0 4.0

Beam diameter selection chart





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Focusing Optics andPinhole Assemblies

FOCUSING OPTICS

These optics are designed for use with the Melles Griot09 LSF 011 spatial filter on page 47.10 to provide a focused beamat the pinhole plane. Choose a focusing optic that will accept a beamfrom 30% to 50% larger than your laser beam to avoid truncationof the Gaussian distribution.

To obtain a smooth cone of light with the desired numericalaperture, use the graph below to choose focusing optics. The 1/e2 focalspot radius (w) can be calculated from the following formula:

w = lf/pw0

where

l = wavelength, f = focal length of the focusing optic, andw0 = input beam radius (1/e2).

If the spatial filter is to be used with a collimator, first select thecollimator and focusing optic using the graphs on the previouspage and the table below, then select the pinhole using the table atthe right.

PINHOLE ASSEMBLIES

Thirteen pinholes are available for matching the aperture to thediameter of the focused laser beam.

Each pinhole is provided in an aluminum assembly that mountsinto the 09 LSF 011 spatial filter on page 47.10. The pinholes areprecisely laser drilled in 0.013-mm stainless steel (0.0025-mmstainless foil for pinholes 2 mm and smaller). All pinholes are excep-tionally round and free from edge defects.

Pinhole selection is directly related to spot size. We recommendusing a pinhole with a diameter of about two times the 1/e2diameterat focus. To select an appropriate pinhole for use with most redhelium neon lasers, refer to the chart below.

NA

OF

OU

TPU

T

0INPUT BEAM RADIUS, w (mm)

.08

.16

.24

.5 1.0 1.5 2.00

.32

.38

.42 4 mm

6 mm

8 mm

12 mm

16 mm

spatial filterfocal lengths

Focusing optics selection chart

Focal

Length f0(mm)

Maximum

Aperture

(mm)

Wavelength

Range

(nm)

PRODUCT

NUMBER

4.0

6.0

8.0

12.0

16.0

1.6

2.4

3.2

4.8

5.0

450–750

450–750

450–750

450–750

450–750

09 LSL 001

09 LSL 003

09 LSL 005

09 LSL 007

09 LSL 009

Focusing Optics

Focusing

Optics

f0 (mm) 0.6 mm 0.8 mm 1.0 mm

4.0

6.0

8.0

12.0

16.0

10

15

20

30

40

8

12

15

25

30

6

10

12

20

25

Pinhole Diameter (mm)

Input Beam Diameter (1/e2)

Pinhole Selection Chart, l = 632.8 nm

Diameter (mm) PRODUCT NUMBER

2.0

3.0

4.0

5.0

6.0

8.0

10.0

12.0

15.0

20.0

25.0

30.0

40.0

09 LSP 001

09 LSP 003

09 LSP 005

09 LSP 007

09 LSP 009

09 LSP 011

09 LSP 013

09 LSP 015

09 LSP 017

09 LSP 019

09 LSP 023

09 LSP 025

09 LSP 027

Pinhole Assemblies



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Shear-PlateCollimation Testers

Melles Griot shear plate collimation testers can be used to setthe divergence/convergence of a laser collimating system to lessthan 20 mrad (full angle). These testers can also be used to measurewavefront radius of curvature, determine wavefront symmetry, andmeasure the power of long-focal-length optics.

$ Testers can be used at all wavelengths in the visible spectrum.

$ They test collimation at beam diameters from 5 to 85 mm.

$ Both 1/4-20 and M6 threaded mounting holes are included.

$ The beam is collimated when the fringes are parallel to thereference line.

Each shear plate module consists of a wedged, uncoated opticalflat mounted in a black aluminum cube complete with high-visibilityviewing screen, and a collimation reference line. To collimate anexpanded laser beam, the module is inserted in the beam and thecollimator is adjusted until the fringes observed on the screen areparallel to the reference line. All Melles Griot shear plate modulesfollow the same sign convention: a convergent beam produces aclockwise rotation of the fringes on the screen relative to the referenceline, while a divergent beam produces a counterclockwise rotation(see figure to the right). The high-visibility viewing screen makes itunnecessary to use low ambient lighting to observe the fringes.These shear plates can be used at any wavelength within the visiblespectrum.

convergingbeam

divergingbeam

collimatedbeam

Fringe orientation with respect to reference line

Shear Plate

Clear Aperture

(mm)

Minimum

Usable

Beam Diameter

(mm)

Fringe Rotation*

Sensitivity

(82%)

(mrad)

Typical**

Collimation

Resolution

(mrad)

Housing

Dimensions

(mm)

W=D ! HPRODUCT

NUMBER

25

50

85

5

10

15

656

230

50

218

76

17

44.5 53.8

76.2 89.2

127.0 142.2

09 SPM 001

09 SPM 003

09 SPM 005

*Defined as full-angle beam divergence or convergence corresponding to a 10% fringe rotation from collimation at 632.8 nm and at full aperture.**Operator-dependent.

Shear-Plate Collimation Testers

SHEAR-PLATE THEORY

A shear plate is a very simple interferometer, i,e, anoptical arrangement that combines two wavefronts.Constructive and destructive interference betweenthe two wavefronts leads to a series of light and darkfringes, corresponding to in-phase and out-of-phaseportions of the wavefronts.

Shear plates are thick, high-quality optical flats.The wavefront or beam to be tested is incident onthe shear plate at a 45 degree angle for maximumsensitivity. The uncoated front and rear surfacesgenerate reflections of almost equal intensity.These reflected wavefronts are said to be “laterallysheared,” i.e., offset with respect to each other,because of the finite thickness of the plate.Interference occurs in the region where thewavefronts overlap.




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Laser to Fiber-OpticCoupler

The Melles Griot laser to fiber-optic coupler provides a simplemethod of capturing and safely delivering collimated laser output.It is supplied with an FC connector.

Available standard with a Melles Griot 06 GLC 002 lens (seeChapter 15, Diode Laser Optics), the modular design allows other06 GLC series lenses to be substituted as necessary.

$ Works with all lenses from the 06 GLC series

$ Differential x-y adjustments provide high resolution

$ All axes have locking collars on all axes.

$ Efficiently couples into single-mode fibers.

SPECIFICATIONS: LASER TO FIBER-OPTIC COUPLER

Connector: FC

Lens: 06 GLC 002, 3 element, f = 8.0 mm

Optical Efficiency: >95% at 632.8 nm

Coupling Efficiency into 10-mm fiber core: >75% at 632.8 nm

Adjustment Range:

x and y axes: 0.980.45 mm (1 turn = 250 mm)

z axis: 1.080.5 mm (1 turn = 150 mm)

Weight: <0.18 kg

Mounting:Post mounting using integral ¼-20 or M6 female threadsmounts directly to Melles Griot cylindrical lasers using4 through holes on 36-mm circle

M3 lockingset screw

locking screw

differentialthumb screw

focusing adjusting knob

FC connector

4 holes f3.6 thruon 36 circle

f45 f46.0

1910

30.5 nominal

37.5 nominal

37.5 nominal

dimensions in mm

09 LFM 001 laser to fiber-optic coupler

PRODUCT NUMBER

09 LFM 001

Laser to Fiber-Optic Coupler



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Melles Griot 05 FDS and 05 FDN fiber-optic laser beam deliverysystems are designed to meet the demanding needs of commerciallaser applications. They set the standard in fiber-delivery efficiency,demonstrating our uncompromising commitment to opticalperformance.$ Highest coupling efficiency — greater than 70%$ Lowest back reflection — less than -45dB$ Multiwavelength operation$ Kinematic launch unit — quick setup and excellent long-term

stability.Melles Griot fiber-optic delivery systems are designed for a real

industrial environment. Single-mode or polarization-preservingfiber is reinforced with a Kevlar and stainless-steel cable that isdesigned to protect the fiber from strain and crushing as well asto limit the bend radius to a safe value. The fiber is fitted withprefocused input and output optics, which efficiently collect anddeliver the laser beam. The input optics consist of a focusing lensand a polished fiber face. The fiber-to-lens separation is set at thefactory for optimum performance, with coupling efficiencies ashigh as 80%.

Unlike traditional fiber-optic coupling systems, which requirefive-axis positioning, prefocused optics only require two axes posi-tioning. Tilt of the assembly becomes translation in the focal plane,and translation becomes tilt. Because the fiber has a relatively largeacceptance angle, the system is insensitive to external translation,leaving only two required degrees of freedom.

BACK REFLECTIONS

Back-reflections are often a source of concern with fiber-opticsystems because the reflections from the ends of a straight-cleavedfiber form a low-finesse Fabry-Perot cavity. When the fiber is usedwith a single-frequency laser, output from the fiber can vary asmuch as 810% as thermal and mechanical perturbations changeits length. There are several solutions to this problem. Applying anantireflection coating to the ends of the fiber reduce reflectionsfrom approximately 4% per surface to less than 1% per surface.For critical applications, where fluctuations must be at an absoluteminimum, Melles Griot polishes the fiber at an angle and refractsthe laser beam into the fiber axis. This method, illustrated in thediagram at the lower right, eliminates the index-matching fluids,cover glasses, and antireflection coatings and results in rejectionratios as high as -50 dB.

POLARIZATION-PRESERVING FIBERS

Melles Griot offers both single-mode and polarization-preserving fibers. Standard single-mode fibers have a circular,symmetrical cross-section. If the fiber is perfectly straight,polarization of the input beam can be preserved as the light travelsthrough the fiber, but when the fiber is bent or coiled, stress in thefiber induces birefringence. The outcome is two modes of propa-gation that recombine with an uncontrollable phase relationship atthe output. This results in polarization drift and fading.

Polarization-preserving fiber, on the other hand, is not opticallysymmetrical and exhibits a strong internal birefringence caused bystress-applying sectors engineered into the fiber. The internal bire-fringence caused by these sectors is much higher than any stressbirefringence induced by bending, and as long as the polarizationof the laser input is properly aligned with the optic axes of the fiber,polarization will be preserved. In addition to setting the focus,both input and output optics are centered so that the optical direc-tionality is aligned to better than 0.5 mrad, making polarizationadjustment easy — simply rotate the optics. There will not be anysignificant loss of transmission.

SYSTEM CONFIGURATION

All of these fiber-optic delivery systems include a detachablekinematic manipulator that attaches with 4-40 UNC screws to thestandard 36-mm-diameter bolt circle found on Melles Griot heliumneon, helium cadmium, and ion laser products, as well as laserproducts from other manufacturers. All fibers include an inputcollimating optical assembly that is integrated into the fiber.05 FDS/FDN 200 series fiber-optic systems incorporate outputre-collimating optics into the assembly. 05 FDS/FDN 100 seriessystems have a keyed FC connector at the output end, but theoutput is not collimated.

Fiber-Optic Laser BeamDelivery Systems

prefocussed optical assembly

4 axes kinematic alignment

angle polished(low reflection)

input

Angle-polished fiber input eliminates back-reflection





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SPECIFICATIONS: FIBER-OPTIC LASER BEAM DELIVERY SYSTEMS

Operating Wavelength1: 458-647 nm

Fiber Length: 2 m

Fiber Protective Jacket: Stainless steel, 5-mm outside diameter

Throughput Efficiency: >65%

Polarization Extinction Ratio: ≥ 20 dB

Polarization Alignment (FDS 100/200 series)2: 82 degrees

Input Beam Diameter (1/e2 points)3: 0.65 mm

Output Beam Diameter (FDS/FDN 200 series)3: 0.65 mm 810%

Output Beam Roundness: ≥95%

M2 Factor: ≤1.2

Pointing Stability: ≤1 mrad/ºC

Operating Temperature: 10-40°C

Operating Humidity: Noncondensing1. Fiber delivery systems are optimized for specific, discrete wavelengths. Contact your nearest

Melles Griot sales office for information on custom wavelengths.2 Relative to alignment key.3 0.70 mm for 633-nm systems.

Polarization-Maintaining Fiber-Optic Laser Beam Delivery Systems

OutputDivergence PRODUCT

Wavelength (full angle) Features NUMBER

Collimated Output

488 nm Only ~2 mrad Low Back Reflections 05 FDS 201

458-514 nm1 ~2 mrad Low Back Reflections 05 FDS 203

488-647 nm2 ~2 mrad Low Back Reflections 05 FDS 205

633 nm Only ~2 mrad Low Back Reflections 05 FDS 207

FC Connector

488 nm Only ~160 mrad FC Keyed Connector 05 FDS 101

458-514 nm1 ~160 mrad FC Keyed Connector 05 FDS 103

488-647 nm2 ~160 mrad FC Keyed Connector 05 FDS 105

1 Specifications apply only at 458, 488, and 514 nm.2 Specifications apply only at 488, 568, and 647 nm.

Single-ModeFiber-Optic Laser Beam Delivery Systems

Output

Divergence PRODUCT

Wavelength (full angle) Features NUMBER

Collimated Output

488 nm Only ~2 mrad Low Back Reflections 05 FDN 201

458-514 nm1 ~2 mrad Low Back Reflections 05 FDN 203

488-647 nm2 ~2 mrad Low Back Reflections 05 FDN 205

633 nm Only ~2 mrad Low Back Reflections 05 FDN 207

FC Connector

488 nm Only ~160 mrad FC Keyed Connector 05 FDN 101

458-514 nm1 ~160 mrad FC Keyed Connector 05 FDN 103

488-647 nm2 ~160 mrad FC Keyed Connector 05 FDN 105

1 Specifications apply only at 458, 488, and 514 nm.2 Specifications apply only at 488, 568, and 647 nm.

dimensions in mm

4 holes mounted on 36 PCD

31.7

31.7 60.0

thumb nuts for precision adjustmentlocking nuts 2 AF socket for allen

key adjustment

kinematicmount

polarization key

length of fiber 2 meters

keyway

birefringence axis

05 FDS/FDN 20005 FDS/FDN 100

50.0 12.0

collimated output beam

05 FDS/FDN series fiber-optic beam delivery system

Custom OEM laser beam delivery systems areavailable as integrated assemblies or componentsupon request. Contact your nearest Melles Griotoffice for assistance.



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Laser AccessoryAdaptors

4 f9.5 thumbscrews threaded 8-32 90° apart

f75.8f65

threaded socket 1-inch–32 TPI1-inch–32 TPI

19.5 13

9.511.0

57

15.9center ofrotation

4 f12.7 thumbscrews threaded 8-32 90° apart

dimensions in mm

4447

25.4

fA

4 holes threaded4-40 x 6.0 deep on 36 circle

M4

f11

dimensions in mm

C-MOUNT HOLDERS

$ Ideal for post mounting of 1-inch-32 TPI male threadedaccessories independently from laser. A variety of mountingposts are available (see Chapter 26, Posts, Pillars, Bases andAdaptor Plates).

dimensions in mm

25.4

f27 f63.5

1 hole threaded1-inch–32 TPI ! 20.6 deep t

Post Thread PRODUCT NUMBER

1/4-20 or M6 07 HLM 001

C-Mount Holder

PRODUCT NUMBER

09 LAR 001

C-Mount Ring

PRODUCT NUMBER

y and z adjustments

y, z, vy, vz adjustments

09 LAM 001

09 LAM 003

Adjustable Alignment Adaptors PRODUCT NUMBER

09 LAR 003

09 LAR 005

Laser Adaptor Hood

LASER ADAPTOR HOODS

$ These heads interface between laser accessories and small-diameter helium neon lasers (see Chapter 44, Helium Neon Lasers)and diode lasers (see Chapter 45, Diode Laser Assemblies). Notrecommended for accessories where beam centration is critical.

C-MOUNT RING

$ Allows direct attachment of 1-inch-32 TPI male threadedbeam expanders and spatial filters to laser heads.

Laser Housing Diameter

fA (mm)

31.5–32.0

35.1

ADJUSTABLE ALIGNMENT ADAPTORS

$ Translation adaptor has two pairs of thumbscrews allowingorthogonal translations of 80.8 mm in the X and Y axes.

$ Translation/rotation adaptor adds an angular adjustment of80.5 degrees in the vx and vy, directions.

1 hole counterboredf27 ! 4.7 deep

4 holes f4 thru counterbored f5 ! 4 deep on 36 circle

1 hole threaded1-inch–32 TPI ! 8 deep

12.7

f44

4 holes threaded 4-40 thru on 36 circle

dimensions in mm





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Cylindrical Laser Holders$ Precise mounting of cylindrical laser heads to tabletops, posts,

or StableRods™

$ Suitable for helium neon or diode lasers from 31.8 to 44.5 mm(1.25–1.75 in.) in diameter

$ Provides fine angular adjustment 84 degree elevation and+3,56 degree azimuth with angular resolution better than0.4 arc minute

$ Optical axis height independent of laser diameter.

For further information regarding the StableRod™ mountingsystem see Chapter 27, Rail and StableRod™ Mounting Systems.

Holders forCylindrical Lasers

34

63

48

f44.5 maxf23 min

65

32.569

2 holes f7 thru counterbored f11 on 50.4 centers

f19

dimensions in mm

f44.5 maxf23 min

10424

max

18f10+4.5

57

76f19

f25.4

25.3

65

18 max

1 hole f7 thru

50.448.6

14.5

85

1 hole f7 thrucounterbored f11

32.5

dimensions in mm

07 HLA 005 cylindrical laser holders

07 HLA 015 cylindrical laser holders

StableRod™ Cylindrical Laser Holders

Inch/Metric Version

Basic Laser Holder, Fixed Orientation

07 HLA 005 Mounting Plate, for 75-mm Optic Axis

Adjustable Laser Holder, Elevation and Azimuth

07 HLA 015 Mounting Plate, for 75-mm Optic Axis

PRODUCT NUMBER

07 HLA 005

07 RPC 027

O7 HLA 015

07 RPC 025




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Precision Cylindrical Laser HolderThis holder is designed for mounting and accurately aiming

cylindrical diode laser or helium neon laser heads.

$ Fine-threaded thumbscrews or micrometer drives for angularadjustment over a 6-degree range

$ Directly mounts to a tabletop, StableRod™ carrier, translationor rotation stage

$ Compatible with metric and inch mounting-hole patterns.

Snap-In Cylindrical Laser Holder$ Snaps between nylon holding pads.

$ Tabletop or post mountable

$ Made from precision formed aluminum with black-anodizedfinish

$ Compatible with metric and inch mounting hole patterns.

4 screwsthreaded M3

1 hole threadedM6 - 8 deep

4 holes f7.5 thru

C

B

fAfD

C G3 E max

10

f16fF

E max

f1364

50.4

50.4

dimensions in mm

3.2

4.8

6.711.1

B C

76.2

64.8

f21 ! 8.5 deep

1 hole threaded1/4-20 ! 8 deep

4 holes f7 thruon 50.6 centers

fA

dimensions in mm

07 HLB and 07 HLC precision cylindrical laser holders

07 HLE snap-in cylindrical laser holder

Snap-In Cylindrical Laser Holders

Precision Cylindrical Laser Holders

Laser Diameter

fA

(mm)

B

(mm)

C

(mm)

PRODUCT

NUMBER

31.6–31.8

34.9

44.5

56.5

57.5

69.5

50.8

50.8

63.5

07 HLE 001

07 HLE 002

07 HLE 003

Adjustment

Type

Laser Diameter

fA

(mm)

PRODUCT

NUMBER

Thumbscrews

Micrometers

44.5–45

31.6–32.5

44.5–45

31.6–32.5

07 HLB 003

07 HLB 005

07 HLC 003

07 HLC 005

B

(mm)

60

55

60

55

C

(mm)

106

100

106

100

fD

(mm)

36

38

36

38




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Laser Safety Eyewear

Melles Griot offers three different types of laser safety eyewearin three different styles. Each type of eyewear is suited for a particularapplication. It is important to consider the wavelength of your laser,the type of exposure, the exposure time, and the energy of yourlaser before making a selection. Melles Griot strongly suggests thatyou consult your laser safety officer (LSO), supervisor, or aMelles Griot application engineer to assist you in choosing theproper protective laser eyewear.

$ All three types of eyewear are ANSI Z136.1 certified for theUS and Asia.

$ CE-certified models are available through our Melles Griotsales offices in Europe.

$ Diffuse viewing only (DVO) eyewear is low cost, lightweight,and impact resistant.

$ Laminated glass technology (LGT) provides good visible lighttransmission and superior scratch resistance, and it has a highdamage threshold.

$ Clear light technology (CLT) combines the light weight of theDVO eyewear with the protection level of the LGT eyewear.

INFORMATION GUIDE FOR LASER SAFETY EYEWEAR

Laser light is extremely directional and intense, andspecial care should be taken when working with lasers.Eye damage is only one of several types of injuriesassociated with lasers. Special care needs to be taken toavoid skin, chemical, and electrical hazards as well.Eye injury is preventable. In most cases, eye damage iscaused by negligence or carelessness. Several differentstructures of the eye can be damaged depending on thewavelengths being used and the amount of absorptionat that wavelength.

The retina can be damaged with small amounts ofenergy in the visible to near-infrared spectral region(400 nm to 1400 nm). Damage to the cornea and lenscan occur with longer wavelengths (1400 nm to3000 nm) and shorter ultraviolet (200 nm to 400 nm)wavelengths. Another factor in retinal damage isexposure time. Though poorly understood, it has beendetermined that damage is caused by differentmechanisms in different temporal regimes:photochemical (t>10 sec), thermal coagulation (10 msec < t <10 sec), and thermoacoustic (nsec)1. With lasers operating in the picosecond (10412) andfemtosecond (10415) regimes, non linear effects make itnearly impossible to extrapolate results from currentdata. For this reason, conservative safety measures havebeen outlined by American institutions and theirinternational counterparts.

It is crucial to choose eyewear designed for the outputwavelength of your laser. Laser safety eyewear works byattenuating, or reducing, the intensity of the lightentering your eye at a specific wavelength. Opticaldensity (OD) is a measure of this attenuation and isdefined by ANSI standards. Optical density is wavelengthdependent and logarithmic; for every whole number theOD increases, the attenuation increases by a factor often. For more detail on optical density, please seeChapter 13, Filters.

1”Laser and LED Eye Hazards: Safety”, David Sliney, Optics andPhotonics News, September 1997


A selection of Melles Griot lasers



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Before choosing your safety eyewear, it is necessary to knowthe laser’s output wavelength(s) and the class of the laseryou will be operating. The classification is determined by thelaser’s potential for hazard. Federal law mandates that thelaser classification be provided with the laser (typicallyaffixed to the laser). The five most common laserclassifications are as follows:

Class I Lasers or laser systems that do not, under normaloperating conditions, pose a hazard.

Class II Low-power visible lasers, which do not normallypresent a hazard because of the aversionresponse of the eye (blinking reflex). Prolongedexposure may cause damage

Class IIIa Lasers that typically would not injure the eye ifviewed for brief periods (<0.25 seconds), but maypresent a greater hazard if used with focusingoptics.

Class IIIb Lasers that may cause damage if viewed directlyor through specular reflections. These laserstypically do not produce hazardous diffusereflections.

Class IV Lasers that are hazardous if viewed directly orthrough specular reflections. Diffuse reflectionsmay also be hazardous. These lasers may alsopresent a risk of skin or fire damage.1

The laser safety eyewear you choose should have an opticaldensity (OD) specified at the output wavelength of yourlaser, sufficient to reduce exposure to Class I radiationlevels. OD is governed by the exposure type, the exposuretime, and the energy output of the laser.

Exposure type is either a diffuse reflection (i.e., a personlooking at a laser spot on an alignment card), or anintrabeam exposure, which may occur by accidently lookingdown the beam path of the laser.

The exposure time depends on whether a laser is operatingwith a continuous wave (cw), a single- pulse, or a repetitivepulse. A laser is considered cw if it operates from0.25 seconds to 30,000 seconds. A single pulse laser operateswith a pulse of less than 0.25 seconds, with a pulse repetitionrate of less than 1 Hz. A repetitive pulsed laser emits pulseseach less than 0.25 seconds, at a rate greater than 1 Hz.

Once you have determined the optical density, you need toselect the style of your eyewear and the visible lighttransmission that meets your personal requirements.

Melles Griot offers three different types of safety eyewear:

■ Diffuse viewing only (DVO) eyewear is low cost,lightweight, and impact resistant. This eyewear is idealwhen exposure to laser radiation is limited to diffusereflection or stray light.

■ Laminated glass technology (LGT) provides goodtransmission of visible light, superior scratch resistance,and an increased damage threshold, making it useful foralignment tasks.

■ Clear lightweight technology (CLT) combines the minimalweight of DVO eyewear with the protection level of theLGT eyewear by placing a multilayer ceramic-shielded filterover polycarbonate.

1Laser Institute of America, “Laser Safety Guide”, 9th edition, 1993.

SELECTING LASER SAFETY EYEWEAR




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PRODUCT NOTE

All DVO eyewear have an optical density of 7 from 190 to 380 nm, and an optical density of 5 at 10,600 nm.

Diffuse Viewing Only (DVO)

Laser Type

Wavelength

Range

(nm)

Optical

Density

Visible

Light Transmission

(%) Spectacle Over the Glasses Goggle

Alexandrite and Ti:Sapphire

Argon Alignment*

Argon, Excimer, HeCd, and DPSS

CO2

Diode, IR

Diode, Visible Alignment

CO2

HeNe Alignment

Diode Lasers, KrAr

Nd:YAG and Diode Lasers

Nd:YAG, Harmonics, and DPSS

Nd:YAG and Diode

Ruby

Visible Lasers

750–765

766–860

488–515

190–532

10,600

830–1,700

670

10,600

632.8

670–680

800–839

840–864

865–1,063

1,064

190–532

800–839

840–864

865–1063

1,064

740–785

785–1,063

1,064

694

450–585

5.5

6

2–3

7

5

2

1–2

5

1–2

4–5

3

4

5

7

7

3

4

5

7

3–4

5

7

5

4–5

30

56

45

80

40

70

41

50

24

32

60

6

16 LPS 025

—

16 LPS 007

16 LPS 009

—

—

16 LPS 013

16 LPS 017

16 LPS 019

—

16 LPS 027

—

—

16 LOG 005

16 LOG 007

16 LOG 009

15 LOG 015

16 LOG 021

16 LOG 013

16 LOG 017

16 LOG 019

16 LOG 011

16 LOG 027

16 LOG 023

—

—

—

16 LPG 009

—

—

16 LPG 013

16 LPG 017

16 LPG 019

—

—

—

PRODUCT NUMBER

*Allows you to see the termination point from your diffuse, cw, argon laser. Maximum energy is 30 watts.



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Laminated Glass Technology (LGT)

Clear Light Transmission (CLT)

Laser Type

Wavelength

Range

(nm)

Optical

Density

Visible

Light Transmission

(%) Spectacle Goggle

Alexandrite, IR Diode, GaAs, HeNe,

Alignment, Nd:YAG, and CO2

Argon, Db:YAG, HeCd, and UV

Erbium, CO2, Nd:YAG, and Holmium

Excimer, UV, and HeCd

Nd:YAG, Harmonics, CO2, HeCd, and

Argon

632.8

750–1050

1050–1064

10,600

190–532

1064–1400

1400–1600

2100, 2800–3200

10,600

190–380

370–380

190–532

1050–1064

10,600

1–2

7

8

4

8

5

4

4

4

9

8

8

6

4

50

42

72

85

25

16 LGS 101

16 LGS 201

16 LGS 301

16 LGS 401

16 LGS 601

16 LGG 101

16 LGG 201

16 LGG301

16 LGG 401

16 LGG 601

PRODUCT NUMBER

Laser Type

Wavelength

Range

(nm)

Optical

Density

Visible

Light Transmission

(%)

PRODUCT NUMBER

Spectacle

Nd:YAG 1064 5 80 16 CLT 005

Other filters for dye, Ti:sapphire, and ruby lasers are available on request. LGT is a registered trademark of Uvex Safety,Incorporated. Please consult ANSI Z136.1, your laser safety officer, or a supervisor to determine the correct lasereyewear of your application.


Laser Accessories Overvie...09 LBM 011 09 LBM 013 09 LBM 015 09 LBM 017 75.0 92.0 117.5 162.5 169 fD...

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Transcript of Laser Accessories Overvie...09 LBM 011 09 LBM 013 09 LBM 015 09 LBM 017 75.0 92.0 117.5 162.5 169 fD...