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

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.

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OL08_1509.pdf (Publisher version), 268KB
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Kwee, Patrick1, Author
Willke, Benno1, Author
Danzmann, Karsten1, Author
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1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, Hannover, DE, ou_24010              

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 Abstract: 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.

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 Dates: 2008-07
 Publication Status: Issued
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 Identifiers: DOI: 10.1364/OL.33.001509
eDoc: 362962
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Title: Optics Letters
Source Genre: Journal
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Pages: - Volume / Issue: 33 (13) Sequence Number: - Start / End Page: 1509 - 1511 Identifier: ISSN: 1539-4794