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Laser Head

Status of Laser Zentrum Hannover Laser Program for Advanced LIGO Maik Frede , Ralf Wilhelm and Carsten Fallnich Laser Zentrum Hannover LSC March 04 Livingston G040116-00-Z. Laser Head. new mechanical design new fiber bundle implemented pump light homogenization.

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Laser Head

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  1. Status of Laser Zentrum Hannover Laser Program for Advanced LIGOMaik Frede, Ralf Wilhelm and Carsten FallnichLaser Zentrum HannoverLSC March 04LivingstonG040116-00-Z

  2. Laser Head • new mechanical design • new fiber bundle • implemented pump light • homogenization

  3. Birefringence Compensation

  4. Efficiency of Bifi.- Compensation  100 % compensation

  5. Comparison proof of concept: optimized design: Output power: 97 W 114,5 W M2x,y: 1.25 1.05 Birefringence Comp.: 95% 100% opt. : 25% 25% Polarization: >100:1 >100:1

  6. 4 head ring lasersetup

  7. 4 head ring laserfirst results: output power 250 200 150 output power [W] 100 50 500 600 700 800 900 1000 1100 pump power [W]  243 W output power with M2 < 3

  8. 4 head ring laserimprove beam quality with mode aperture  213 W output power with M2 < 1.15

  9. 4 head ring laserTEM00-operation  TEM00 operation with M2 < 1.15

  10. 4 head ring laserpower-noise

  11. Pound-Drever-Hall Injection-Locking Advanced LIGO conceptual design 0.8W 12W

  12. Advanced LIGO integrated front-end 800mW NPRO 12 W GEO 600 design  12 -14 W single frequency M2 <1.05

  13. Advanced LIGO high power slave  213 W output power with M2 < 1.15

  14. summary • high power slave-laser • output power: 213 W • beam quality, M2:< 1.15 • polarization: > 100:1 • optical efficiency: 23 % • front - end • components in place

  15. outlook / to do • optimizing the high-power slave resonator • finish work on front-end •  start injection-locking

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