Abstract
We present results on the power stabilization of a laser in the frequency band from 1 Hz to . High-power, low-noise photodetectors are used in a dc-coupled control loop to achieve relative power fluctuations down to at and up to several kHz, which is very close to the shot-noise limit for 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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