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Laser power stabilization using optical ac coupling and its quantum and technical limits

MPS-Authors
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Kwee,  Patrick
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Willke,  Benno
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Danzmann,  Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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ApplOpt48_5423.pdf
(Publisher version), 743KB

ao-48-28-5423.pdf
(Any fulltext), 723KB

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Citation

Kwee, P., Willke, B., & Danzmann, K. (2009). Laser power stabilization using optical ac coupling and its quantum and technical limits. Applied Optics, 48(28), 5423-5431. doi:10.1364/AO.48.005423.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-60FB-C
Abstract
We demonstrate an active power stabilization of a Nd:YAG laser employing the optical ac-coupling scheme and derive its fundamental quantum limit. This limit is 3 dB better than the one encountered in traditional power stabilization schemes. In our experiment, the optical ac coupling improved the shot-noise-limited sensitivity of the stabilization photodetector by a factor of 11.2. With an independent photodetector, we measured a relative power stability of 3.7×10−9 Hz−1/2 at frequencies of around 200 kHz. A detailed investigation of the performance limit of our experiment revealed a novel noise source that disturbed the fundamental mode field in the optical resonator. This effect could be of relevance to many precision experiments using optical resonators.