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Optical ac coupling to overcome limitations in the detection of optical power fluctuations

MPG-Autoren

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

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

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

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OL08_1509.pdf
(Verlagsversion), 268KB

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Zitation

Kwee, P., Willke, B., & Danzmann, K. (2008). Optical ac coupling to overcome limitations in the detection of optical power fluctuations. Optics Letters, 33(13), 1509-1511. doi:10.1364/OL.33.001509.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-62B9-0
Zusammenfassung
A high-sensitivity detection method for optical power fluctuations is demonstrated based on photodetection in reflection of an optical resonator with a specific impedance matching. That resonator is used to reduce the carrier power reflected by the resonator while preserving the power fluctuation sidebands for frequencies above the resonator bandwidth. A sensitivity of 7×10−10 Hz−1/2 for relative power fluctuations was achieved with only 3 mA of detected photocurrent and 99.6% of the power remained for downstream experiments. As in the widely used ac coupling of electrical signals, this technique overcomes dynamic-range limits and reduces detector noise associated with large carrier amplitudes of the optical field.