ESPI vibration fringe enhancement by laser diode wavelength modulation

Yaotang Li; Ichirou Yamaguchi; Jun-ichi Kato

doi:10.1117/12.135300

1 January 1992 ESPI vibration fringe enhancement by laser diode wavelength modulation

Yaotang Li, Ichirou Yamaguchi, Jun-ichi Kato

Proceedings Volume 1553, Laser Interferometry IV: Computer-Aided Interferometry; (1992) https://doi.org/10.1117/12.135300
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

A novel technique for enhancing the time-average ESPI vibration fringes is presented in this paper. The technique is based on the use of wavelength modulation of a laser diode which is adopted in the interferometer as a coherent laser source. The wavelength modulation of the laser diode gives rise to both the additional phase shift and the speckle decorrelation by which the time-average ESPI vibration fringe quality is improved.

Citation Download Citation

Yaotang Li, Ichirou Yamaguchi, and Jun-ichi Kato "ESPI vibration fringe enhancement by laser diode wavelength modulation", Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); https://doi.org/10.1117/12.135300

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