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Proceedings Paper

Fringe-locking phenomenon in a laser diode interferometer with optical feedback
Author(s): Yaqiong Bao; Hansong Su; Yong Yang
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Paper Abstract

A fringe locking phenomenon in a two beam-laser diode interferometer with strong optical feedback observed in the system is studied in this paper. If a fraction of at least 0.1% of the laser diode output power is returned to it, the fringes are locked even in the presence of the vibrations of an interferometer mirror. The phenomenon is useful for real-time measurement with high accuracy, for it decreasing the measurement error caused by the environment. A theoretical model has been proposed which is based on a four-mirror equivalent Fabry-Porot cavity including the laser cavity and the interferometer. Through theoretical deduction and numerical analysis using the model, the resonant condition of the laser diode was concluded and the dependence of wavelength on the change of the optical path difference of the interferometer calculated, then the fringe locking phenomenon can be well explained. The fringe locking phenomenon is also experimentally studied. It can be observed that when the mirror is driven slowly with a sawtooth wave with a frequency of 100Hz and an amplitude of 1.2μm the fringe locking phenomenon occured. Dependence of the wavelength on the optical path difference is measured too.

Paper Details

Date Published: 10 February 2005
PDF: 7 pages
Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005); doi: 10.1117/12.575243
Show Author Affiliations
Yaqiong Bao, Tianjin Univ. (China)
Hansong Su, Tianjin Univ. (China)
Yong Yang, Tianjin Univ. (China)

Published in SPIE Proceedings Vol. 5638:
Optical Design and Testing II
Yongtian Wang; Zhicheng Weng; Shenghua Ye; Jose M. Sasian, Editor(s)

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