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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry van Driel
  • Vol. 27, Iss. 12 — Dec. 1, 2010
  • pp: 2499–2504

Fiber-coupled near-infrared laser heterodyne interferometer with fast optical scanning

Long Gao, Chunhui Wang, Yanchao Li, Haifang Cong, and Yang Qu  »View Author Affiliations

JOSA B, Vol. 27, Issue 12, pp. 2499-2504 (2010)

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A fiber-coupled infrared laser heterodyne interferometer system based on optical scanning is proposed. In this system, the sample is scanned through the combined configuration of a micro-electro-mechanical system mirror and an F-theta lens set. The distortion index of the F-theta lens set is less than 0.01%. In order to enhance the sensitivity of the heterodyne detection system, the dual-balanced heterodyne detection is applied in the measurement of the intermediate frequency signal. The theoretical model and the signal-to-noise ratio expression of the dual-balanced heterodyne detection system are derived in this paper. The interferometer system has a vertical resolution of 0.43 nm and a lateral resolution of 0.95 μ m . The stability of this system is approximately 1.90 nm for 1 h. Furthermore, the system possesses 8 s measurement time, 94.18 MHz output frequency, and 1550 nm eye-safe operating wavelength. Application of the system may be realized for any sample that has higher transmittance for the eye-safe wavelength.

© 2010 Optical Society of America

OCIS Codes
(030.4280) Coherence and statistical optics : Noise in imaging systems
(040.2840) Detectors : Heterodyne
(120.4630) Instrumentation, measurement, and metrology : Optical inspection

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 25, 2010
Revised Manuscript: September 1, 2010
Manuscript Accepted: October 3, 2010
Published: November 3, 2010

Long Gao, Chunhui Wang, Yanchao Li, Haifang Cong, and Yang Qu, "Fiber-coupled near-infrared laser heterodyne interferometer with fast optical scanning," J. Opt. Soc. Am. B 27, 2499-2504 (2010)

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