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Proceedings Paper

Robust interferometry using optical feedback of a laser diode
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Paper Abstract

A simple and robust interferometer using a laser diode subject to optical feedback is presented. The mechanism of fringe locking is first explained in terms of the compound cavity composed of the laser and the interferometer. Our theoretical analysis showed that the fringe locking is caused by compensation for a change in the path difference by mode hopping between external cavity modes of the laser diode. Fringe phase can be locked by the optical feedback within less than 0.2 (pi) (peak to valley) even when the interferometer is placed on a wooden table where in the absence of optical feedback whereas the fringe fluctuation amounts to about 6 (pi) (peak to valley value). The locked fringe pattern with spatial carriers can be analyzed by a fringe analyzer at the video rate and the measured results of a spherical error showed the same values of spherical mirror and repeatability as on an optical bench.

Paper Details

Date Published: 13 August 1999
PDF: 9 pages
Proc. SPIE 3744, Interferometry '99: Techniques and Technologies, (13 August 1999); doi: 10.1117/12.357736
Show Author Affiliations
Ichirou Yamaguchi, RIKEN-Institute of Physical and Chemical Research (Japan)
Jiyuan Liu, RIKEN-Institute of Physical and Chemical Research (United States)

Published in SPIE Proceedings Vol. 3744:
Interferometry '99: Techniques and Technologies
Malgorzata Kujawinska; Mitsuo Takeda, Editor(s)

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