Abstract

We present results on the power stabilization of a Nd:YAG laser in the frequency band from 1 Hz to 100kHz. High-power, low-noise photodetectors are used in a dc-coupled control loop to achieve relative power fluctuations down to 5×109Hz12 at 10Hz and 3.5×109Hz12 up to several kHz, which is very close to the shot-noise limit for 80mA of detected photocurrent on each detector. We investigated and eliminated several noise sources such as ground loops and beam pointing. The achieved stability level is close to the requirements for the Advanced LIGO gravitational wave detector.

© 2006 Optical Society of America

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