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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 33, Iss. 13 — Jul. 1, 2008
  • pp: 1509–1511

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

Patrick Kwee, Benno Willke, and Karsten Danzmann  »View Author Affiliations


Optics Letters, Vol. 33, Issue 13, pp. 1509-1511 (2008)
http://dx.doi.org/10.1364/OL.33.001509


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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.

© 2008 Optical Society of America

OCIS Codes
(040.5160) Detectors : Photodetectors
(230.5750) Optical devices : Resonators

ToC Category:
Optical Devices

History
Original Manuscript: April 7, 2008
Revised Manuscript: May 26, 2008
Manuscript Accepted: May 28, 2008
Published: June 27, 2008

Citation
Patrick Kwee, Benno Willke, and Karsten Danzmann, "Optical ac coupling to overcome limitations in the detection of optical power fluctuations," Opt. Lett. 33, 1509-1511 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-13-1509


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