Polarization-based balanced heterodyne detection method in a Sagnac interferometer for precision phase measurement

Optics Letters
K X SunR L Byer

Abstract

We describe a balanced heterodyne detection method for a Sagnac interferometer that uses a polarization-dependent beam splitter. The signal and the local oscillator are orthogonally polarized components of a single laser beam, permitting the detection of the signal by subtraction of two photocurrents produced in appropriate polarization projections. Using this scheme, we experimentally demonstrate a phase measurement with a sensitivity of 9x10(-10) rad/ radicalHz. The measurement is robust in the presence of laser frequency noise, as a result of preserving the common-path nature of the Sagnac interferometer, and of laser-amplitude noise, as a result of balanced detection.

References

Apr 22, 1996·Physical Review Letters·K X SunR L Byer
Apr 1, 1996·Applied Optics·M B GrayD E McClelland

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Citations

Jan 13, 2018·Applied Optics·L M RioboP A Sorichetti
Jul 13, 2005·Applied Optics·Peter T BeyersdorfMarcel Agüeros

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