2J Green High Energy DPSS Laser9b54c437a0e032d4eb32-010f1da83de0c62ea8c11f5612b46edb.r27.… ·...

Gigashot™ HE

2J Green

High Energy DPSS Laser

Jay Doster, Ph. D.

© 2015 Northrop Grumman Systems Corporation

Senior Laser Scientist, Cutting Edge Optronics, Inc.

2015 CLEO/Laser Focus World

Innovation Award Winner

CEO Overview

• Cutting Edge Optronics (CEO) - owned

by Northrop Grumman

– Aerospace Systems Sector

– Space Systems Division

• Located near St. Louis, MO, USA

– 36,000 ft2 facility (3,350 m2)

– All R&D, manufacturing, sales and support

staff housed in this facility


2 Approved for Public Release: Northrop Grumman Aerospace Systems Case 15-0966

Northrop Grumman – Cutting Edge Optronics / Phone: (636) 916-4900 / Email: [email protected]

Vertically Integrated Manufacturing

3

Outsourced EPI

Growth

Internal or External

Diode Bars

Ext. Sales

Ext. Sales

Ext. Sales

Ext. Sales

CEO designs &

manufactures DPSS

lasers and components

for commercial, medical,

scientific, and military

applications.

© 2015 Northrop Grumman Systems Corporation Approved for Public Release: Northrop Grumman Aerospace Systems Case 15-0966


Gigashot™ HE Key Specifications

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• Wavelength: 532 nm

• Single Longitudinal Mode

• Pulse Energy: >2 J

• Repetition Rate: 10 Hz

• Pulse Energy Stability: <0.5% rms

• Long Term Energy Drift: <2% rms

• Smooth Flat-Top Beam Profile

• Beam Pointing Stability: <50 mrad



Approved for Public Release: Northrop Grumman Aerospace Systems Case 15-0966

Technical Approach:

All Diode Pumped Nd:YAG Laser

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• MOPA (Master Oscillator Power Amplifier) structure – Energy and repetition rate scalable design

• Injection seeded EO-QS stable cavity oscillator – Single wavelength operation

– TEM00 Gaussian beam profile

• Beam shaping – Smooth flat-top

• Relay-imaging amplification – Preserve smooth flat-top beam quality

• PowerPULSETM diode pumped amplifiers (COTS) – Ultra-long life quasi-continuous-wave (QCW) diode bars (> 10 B shots)

– Wide selection of pump energy and rod diameters




Layout of Laser

6 © 2015 Northrop Grumman Systems Corporation



TEM00, Injection Seeded Oscillator

• Single transverse mode operation. M2 of < 1.3.

• Stable center frequency.

• Line width narrowed.

• Smooth temporal profile, 10ns pulse width.

7 Northrop Grumman – Cutting Edge Optronics / Phone: (636) 916-4900 / Email: [email protected]

© 2015 Northrop Grumman Systems Corporation Approved for Public Release: Northrop Grumman Aerospace Systems Case 15-0966

Oscillator Beam Profile

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Near Field Beam Profile Far Field Beam Profile



• Gaussian beam profile, near and far field.


Beam Shaping Flat-top Beam Profile



• After creation of a flat top beam profile, it

must be maintained through the amplifier

system.

• Relay telescopes are used to place the

image of the beam near field at each

amplifier.

• Amplification takes place on the flat top

profile.

• Final output is 532nm, 2J.


Beam Pointing



• Beam pointing stability of the laser is better than 30 µrad over one

hour.


Pulse Width and Jitter



• Temporal pulse of the output should be smooth and low jitter.

• Pulse width is 7.7ns, smooth, and with a jitter about 0.5ns measured from external trigger to light output.


Long Term Energy Stability



• Energy stability is better than 0.5% rms over an 8 hour period.


Short Term Pulse Energy



• Short term energy stability is better than 0.4% rms over 2 Hours.


Gigashot™HE 2 J, 532 nm DPSS Laser

• First commercial 2J DPSS high energy green laser in the world

• Smooth flat-top beam profile is ideal for scientific applications such as pumping Ti:sapphire, OPOs and OPCPA where gain uniformity is key

• High pulse-to-pulse energy stability

• Superior long-term pulse energy stability

• Low maintenance, ‘hands-off’ operation

• Long life, energy efficient diode pumping

– (2 yr/10,000 hr diode warranty)

• Scalable to >100 Hz and higher energy

– Injection-seeded,10 J IR, 20 Hz laser demonstrated (Ship to end-user March 2015)

• Customized versions available




2J Green High Energy DPSS Laser9b54c437a0e032d4eb32-010f1da83de0c62ea8c11f5612b46edb.r27.… ·...

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