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Proceedings Paper

Laser diode optical feedback interferometer for surface measurement outside optical benches
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Paper 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.

Paper Details

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347757
Show Author Affiliations
Jiyuan Liu, RIKEN--The Institute of Physical and Chemical Research (United States)
Ichirou Yamaguchi, RIKEN--The Institute of Physical and Chemical Research (Japan)


Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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