Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Precision Measurements and Metrology III
Q 29.9: Vortrag
Mittwoch, 10. März 2010, 16:00–16:15, A 310
Wideband frequency stabilization of a 200-W injection-locked laser — •Hyunjoo Kim1, Rick Savage2, Benno Willke1, and Karsten Danzmann1 — 1Albert-Einstein-Institut, Hannover, Germany — 2LIGO Hanford Observatory, USA
We present a wideband frequency stabilization servo system for a 200-W injection-locked Nd:YAG laser that uses the Pound-Drever-Hall locking technique with a high-finesse optical cavity to control the frequency of the master laser. The Advanced LIGO laser consists of a non-planar ring oscillator followed by a four-rod, single-pass, 35-W amplifier and a 200-W injection-locked oscillator. A pre-modecleaner filters the laser light, after which sample beam is directed to frequency stabilization control loop. Additional downstream frequency sensor enables further stabilization via nested control loop. The injection-locked oscillator cavity and the pre-modecleaner introduce transfer functions that make realizing the required 500 kHz unity gain frequency more challenging. We describe a scheme for compensation of the induced phase delays by a phase-lead network in the servo electronics and the results of preliminary measurements with the wideband frequency stabilization servo.