Robust interferometry using optical feedback of a laser diode

Ichirou Yamaguchi; Jiyuan Liu

doi:10.1117/12.357736

13 August 1999 Robust interferometry using optical feedback of a laser diode

Ichirou Yamaguchi, Jiyuan Liu

Proceedings Volume 3744, Interferometry '99: Techniques and Technologies; (1999) https://doi.org/10.1117/12.357736
Event: International Conference on Optical Metrology, 1999, Pultusk Castle, Poland

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.

Citation Download Citation

Ichirou Yamaguchi and Jiyuan Liu "Robust interferometry using optical feedback of a laser diode", Proc. SPIE 3744, Interferometry '99: Techniques and Technologies, (13 August 1999); https://doi.org/10.1117/12.357736

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