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10W Injection-Locked CW Nd:YAG laser

10W Injection-Locked CW Nd:YAG laser. David Hosken, Damien Mudge, Peter Veitch , Jesper Munch Department of Physics The University of Adelaide Adelaide SA 5005 Australia. LSC – LLO March 2004 LIGO-G040069-00-Z. Talk Outline. Overall motivation ACIGA HPTF

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10W Injection-Locked CW Nd:YAG laser

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  1. 10W Injection-Locked CW Nd:YAG laser David Hosken, Damien Mudge, Peter Veitch, Jesper Munch Department of Physics The University of Adelaide Adelaide SA 5005 Australia LSC – LLO March 2004 LIGO-G040069-00-Z

  2. Talk Outline • Overall motivation • ACIGA HPTF • Laser design • Laser performance • Conclusions LSC – LLO March 2004 LIGO-G040069-00-Z

  3. Overall Motivation • Gravitational wave interferometers require high power CW lasers that produce a single frequency TEM00 mode LSC – LLO March 2004 LIGO-G040069-00-Z

  4. Overall Motivation • Gravitational wave interferometers require high power CW lasers that produce a single frequency TEM00 mode • Our strategy: injection-locked chain • - injection-locking of 5W prototype previously demonstrated LSC – LLO March 2004 LIGO-G040069-00-Z

  5. Overall Motivation • Gravitational wave interferometers require high power CW lasers that produce a single frequency TEM00 mode • Our strategy: injection-locked chain • - injection-locking of 5W prototype previously demonstrated • Specific project objectives: • Field deployable 10W TEM00 CW Nd:YAGtravelling-wave slave laser • Characterise injection-lock • Meet or exceed the frequency and intensity noiserequirements of ACIGA / TAMA 300 LSC – LLO March 2004 LIGO-G040069-00-Z

  6. ACIGA HPTF • The lasers we are developing will be delivered to the AustralianConsortium for Interferometric Gravitational Astronomy (ACIGA) high power test facility (HPTF) at Gingin, Western Australia. • We will also provide a laser upgrade for the TAMA300 gravitational wave interferometer in Japan. The Australian International Gravitational Observatory (AIGO) LSC – LLO March 2004 LIGO-G040069-00-Z

  7. Gain Medium for 10W Slave Laser • Coplanar folded zigzag slab (CPFS) * • Side pumped using fast-axis collimated diode bars (Diode power derated for increased lifetime) *J. Richards and A. McInnes, Opt. Lett.20, (1995), 371. LSC – LLO March 2004 LIGO-G040069-00-Z

  8. Gain Medium for 10W Slave Laser • Top and bottom cooled • Mounted on a single air-cooled base •  Compact laser with increased portability and reliability LSC – LLO March 2004 LIGO-G040069-00-Z

  9. Standing-Wave Results LSC – LLO March 2004 LIGO-G040069-00-Z

  10. Standing-Wave Results With ~20mm mirror to slab arm lengths we achieved: • Multimode power = 15.9W (40W pump power) • Multimode slope efficiency = 45% LSC – LLO March 2004 LIGO-G040069-00-Z

  11. Travelling-Wave Resonator LSC – LLO March 2004 LIGO-G040069-00-Z

  12. Travelling-Wave Resonator Injection locking servo control system: Low bandwidth, high dynamic range PZT plus high bandwidth, low dynamic range PZT together provide sufficient bandwidth and dynamic range. LSC – LLO March 2004 LIGO-G040069-00-Z

  13. 10W Slave Laser LSC – LLO March 2004 LIGO-G040069-00-Z

  14. ACIGA HPTF and TAMA Lasers LSC – LLO March 2004 LIGO-G040069-00-Z

  15. Control and Confinement of Mode • Astigmatic thermal lensing in the pumped slab: fvertical ~ 6-8cm fhorizontal ~ 2-3m • Vertical (cooling) plane - mode confinement provided primarily by strong thermal lensing - mode control achieved by matching the laser mode to the pumpedregion • Horizontal plane - mode confinement by residual curvature of the slab sides, very weak thermal lens and mirror curvature - higher order mode rejection by apertures formed by Brewster entrance/exit windows Careful adjustment of cavity length and pump power achieves an excellent fundamental mode, in both horizontal and vertical planes. LSC – LLO March 2004 LIGO-G040069-00-Z

  16. Travelling-Wave Results • Using 90% reflective, 5.00m • concave output coupler • M2horizontal < 1.1 • M2vertical < 1.1 • Output power = 9.2W • (31W pump power) • Measured using Spiricon M2 • Beam Analyser LSC – LLO March 2004 LIGO-G040069-00-Z

  17. Injection-Locking Setup LSC – LLO March 2004 LIGO-G040069-00-Z

  18. Injection-Locking Setup LSC – LLO March 2004 LIGO-G040069-00-Z

  19. Injection-Locking Setup LSC – LLO March 2004 LIGO-G040069-00-Z

  20. Injection-Locking Setup LSC – LLO March 2004 LIGO-G040069-00-Z

  21. Passive injection-locking • Multi- longitudinal mode operation of free-running slave laser (left), and single frequency operation (right) when locked using a stable masterlaser. • Currently developing and testing a PDH servo control circuit, and • have achieved prolonged suppression of reverse-wave with • closed servo loop (Traces measured using a scanning Fabry-Perot cavity (10GHz FSR)) LSC – LLO March 2004 LIGO-G040069-00-Z

  22. Conclusions Progress to date: • Efficient robust compact design • Robust thermal control system • M2x,y < 1.1 with 9.2W output in travelling-wave • Short term injection-locking achieved Future plans: • Increase output power to over 10W • Long-term injection-locking • Characterisation of noise Delivery of injection-locked laser to AIGO in May 2004. LSC – LLO March 2004 LIGO-G040069-00-Z

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