Quasi-Common-Path Laser Feedback Interferometers for Precision Measurement of Non-Cooperative Targets

Abstract:

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In this paper, we report a novel quasi-common-path laser feedback interferometer (QLFI) for highly stable, high-resolution and non-contact displacement measurement. QLFI measures the displacement of the target by measuring the phase of feedback light. In addition to the target-generated feedback light (frequency shifted by 2#), a reference mirror generates a reference feedback light which is frequency shifted by #. The phase variations of both feedback lights are measured by heterodyne detection simultaneously and their difference offers the phase variations caused only by target displacement. When the optical path lengths of the reference and measuring feedback light are nearly the same, the phase fluctuations caused by the environment and laser instability are effectively removed. The heat-induced deformation of a He-Ne laser tube is successfully in-line measured using QLFI.

Info:

Periodical:

Key Engineering Materials (Volumes 381-382)

Edited by:

Wei Gao, Yasuhiro Takaya, Yongsheng Gao and Michael Krystek

Pages:

49-52

DOI:

10.4028/www.scientific.net/KEM.381-382.49

Citation:

X.J. Wan and S. L. Zhang, "Quasi-Common-Path Laser Feedback Interferometers for Precision Measurement of Non-Cooperative Targets", Key Engineering Materials, Vols. 381-382, pp. 49-52, 2008

Online since:

June 2008

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Price:

$35.00

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