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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 6 — Feb. 20, 2014
  • pp: 1047–1051

Low-coherence heterodyne interferometry using an achromatic frequency shifter based on a frequency-domain optical delay line

Sheng-Hua Lu, Hsiao-Ping Chiang, Che-Yu Lin, and Che-Chung Chou  »View Author Affiliations


Applied Optics, Vol. 53, Issue 6, pp. 1047-1051 (2014)
http://dx.doi.org/10.1364/AO.53.001047


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Abstract

In this paper a high-sensitivity low-coherence heterodyne interferometric system consisting of two polarizing Michelson interferometers arranged in tandem is presented. A compact frequency-domain optical delay line was placed in the first interferometer to produce a 4.4 kHz frequency shift for broadband near-infrared light. The frequency shift was wavelength independent because the scanning delay line had a zero-group-delay configuration. The fringe amplitude and phase of a low-coherence interference signal were detected using a lock-in amplifier. The experimental results show that the signal-to-noise ratio in the proposed technique is more than 30-fold higher than that of conventional low-coherence homodyne interferometry.

© 2014 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5060) Instrumentation, measurement, and metrology : Phase modulation

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 23, 2013
Revised Manuscript: January 4, 2014
Manuscript Accepted: January 7, 2014
Published: February 12, 2014

Citation
Sheng-Hua Lu, Hsiao-Ping Chiang, Che-Yu Lin, and Che-Chung Chou, "Low-coherence heterodyne interferometry using an achromatic frequency shifter based on a frequency-domain optical delay line," Appl. Opt. 53, 1047-1051 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-6-1047


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