Fiber-Coupled Cryogenic Radiometer with ... - physics.nist.gov
Transcript of Fiber-Coupled Cryogenic Radiometer with ... - physics.nist.gov
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20 Sep 2011, Newrad 2011
Fiber-Coupled Cryogenic Radiometer
with Carbon Nanotube Absorber
J.H. Lehman
National Institute of Standards and Technology
325 Broadway, Boulder, Colorado 80305-3228
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David Livigni, Nathan Tomlin, Christopher L. Cromer
National Institute of Standards and Technology, Boulder, Colorado, U.S.A.
Chris Chunnilall, Theo Theocharous
National Physical Laboratory, Teddington, Middlesex, U.K.
Acknowledgments
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Where
Physical Measurement Laboratory
Quantum Electronics and Photonics Division
Sources and Detectors Group
Laser Radiometry Project (11 people)
Laser Power Meter Calibration Services (10 % of NIST by income)
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Wavelength m
0.1 1 10
lithography
communications
night vision systems
space - based sensors
industrial mfg. processes
medical systems
Pow
er
(W)
The next generation of detectors for laser power and energy
measurements traceable to NIST E
nerg
y (J
)
10-9
105 106
10-12
misc. military
chem/bio
Why
quantum candle
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Motivation
1. C-series
2. LOCR
3. Fiber-based responsivity
with FC connector
4. Spectral responsivity
Detector
Nearly collimated
Diverging from fiber
Diverging from
monochromator
(6 nm bandwidth)
Beam geometry Measurement system
“Relative”
Absolute
(The customer)
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Motivation
J. H. Lehman, C. M. Wang, M. L. Dowell, and J. A.
Hadler, Journal of Research of the National Institute of
Standards and Technology, 114, 287-291, 2009.
Absolute and Spectral Responsivity
(laser)
(f/4 monochromator and bulb)
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Transfer Standards
4x Trap detectors
J. H. Lehman and C. L. Cromer, Appl. Opt., 41, 6531-6536, 2002.
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Cryogenic Radiometer
fiber in??
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Ideal scenario
fiber in
standard
Test
Goal: all-fiber coupling to test and standard detectors
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Dilution fridge, micromachining and carbon nanotubes
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centering ring
for fiber
1.4 mm
Micromachined components
1 cm
cavity ends and witness
Deep Reactive Ion Etch (DRIE)
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Reflectance Results
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
5 10 15 20 25 30 35 40 45 50
Wavelength (m)
Hem
ispherical r
efle
cta
nce
VA40VA150
BSiCNnCylSi
See also OPM_OR_001
1300 1400 1500 1600Wavelength / nm
0
100
200
300
400
500
600H
emis
ph
eric
al r
efle
ctan
ce /
10
-6 Reflectance
Standard Deviation(ppm
)
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tubular heat link
fiber
cavity
absorber heater
thermometer
centering ring
Cavity assembly
~ 5mm
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Measurement setup
dilution
refrigerator
4 K stage
attenuators
laser
power meter manual
switch
T, R (out)
I in
optical in
fiber
assembled
fiber/cavity 70 mm
T, R (out)
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Results
0 200 400 600 800 1000Time / minutes
3.6
3.8
4
4.2
4.4
Th
erm
isto
r T
emper
ature
/ K
Electrical Power
Optical Power
1 nW 3 nW
10 nW
30 nW
100 nW
Example
measurement at ~ 10 nW
1/e time constant
~ 12 minutes
(Values of power shown are nominal)
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Optical/Electricial Results Summary
(U ~ 4.6 %)
10-7 1 10 100
Power (nW)
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Optical/Electricial Results Summary
(U ~ 4.6 %)
1 10 100
Power (nW)
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Optical/Electricial Results Summary
Power law fits for conductance modes and inequivalence
T3 insulator (phonon) - no
T1 metal (electron) -yes
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Demonstrated first nanoWatt Radiometer for Fiber
Measurements
Micromachining and carbon nanotubes
Electrical is slightly more efficient linear
(but uncertainties are high)
Next iteration, shorter time constant
Reduce inequivalence, evaluate uncertainties, improve
optical coupling
Summary and Future
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Results
new
(ne
w)
dilut
ion
refri
ger
ator
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tubular heat link
fiber spacer
cavity
absorber
heater
thermometer
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CNTs on detectors laser radiometry
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
5 10 15 20 25 30 35 40 45 50
Wavelength (m)
Hem
ispherical r
efle
cta
nce
VA40VA150
BSiCNnCylSi
1 cm
Topology: sparse, rough, long, repeatable
Behavior: 100 % black, uniform
On something useful!!
‘darkest detector’
390 µm absorber
Thermopile
Pyroelectric
w/ E. Grossman
w/ NIST-G w/ NPL
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Optical/Electricial Results Summary
Approximate
Power
(nW)
Optical Power Electrical Power
Responsivity
(nW/K)
1/e Time
Constant
(minutes)
Responsivity
(nW/K)
1/e Time
Constant
(minutes)
1 n/a n/a 149 12.4
3 154 12.7 149 13.3
10 160 12.1 153 12.9
30 160 13.9 150 13.8
100 164 15 152 15.4
Measured responsivity and time constant for optical and electrical power
injections. (n/a – not available due to bad curve fit. )
U = 4.55 % (k=2)
(OFPM type B) U = 3 % (k=2)
(thermistor type B)