Compulsorily phase-locked interferometer using orthogonally polarized light source of a modulated LD with high extinction ratio

Noboru Nakatani

doi:10.1117/12.427036

8 May 2001 Compulsorily phase-locked interferometer using orthogonally polarized light source of a modulated LD with high extinction ratio

Noboru Nakatani

Author Affiliations +

Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001) https://doi.org/10.1117/12.427036
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '01), 2001, Yokohama, Japan

Abstract

This paper describes the compulsorily phase locked differential interferometer using orthogonally polarized light source of a modulated LD with high extinction ratio for reducing non-linearity of the interferometer due to polarization cross-talk. The current modulated LD are used as a light source for making the interferometer a compact and for scanning phase of the interferometer. A Wollaston prism of high extinction ratio (50 dB) is used as a beams combiner of the polarizing beams for making the polarization cross-talk very small. In one light source the polarized output beams are on the same propagation axis. In the other light source the polarized output beams have small crossing angle (2.5 mrad approximately equal to 10 mrad) for excluding completely non-linearity of the interferometer due to polarization cross-talk. It is confirmed that the cross- talk components of these developed light sources are very small compared with those of the conventional orthogonally polarized light source using polarizing beam splitters. Using jets of a gas mixture of nitrogen and ethylene, it was demonstrated that the compulsorily phase locked differential interferometer is useful to detect photothermal effect of photothermal velocimeter in turbulent flow.

Citation Download Citation

Noboru Nakatani "Compulsorily phase-locked interferometer using orthogonally polarized light source of a modulated LD with high extinction ratio", Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); https://doi.org/10.1117/12.427036

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