7 May 1999 Laser diode optical feedback interferometer for surface measurement outside optical benches
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Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347757
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan
Abstract
A simple robust interferometer using a laser diode subject to optical feedback from the interferometer is presented. Fringe phase can be locked by the optical feedback within less than 0.2(pi) (peak to valley value) even when the interferometer is placed outside optical benches where the fringe movement caused by vibration amounts to about 6(pi) (peak to valley value) in the absence of optical feedback. The fringe locking is caused by the change of lasing wavelength that suppresses the net phase change to be much less than 2(pi) . The locked fringe pattern with spatial carries can be analyzed by a fringe analyzer at video rate and the measured results of a spherical mirror showed the same accuracy as on an optical bench.
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Jiyuan Liu, Jiyuan Liu, Ichirou Yamaguchi, Ichirou Yamaguchi, } "Laser diode optical feedback interferometer for surface measurement outside optical benches", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347757; https://doi.org/10.1117/12.347757
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