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2 February 2009 Phase-shifting interferometry using a multi-mode blue laser diode
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A phase-shifting interferometry (PSI) using a multi-longitudinal-mode blue laser diode was developed. Since the longitudinal modes of a laser diode are located almost at even interval and changes synchronously with the injection current, by setting an optical path difference between two arms of an interferometer in such a way that makes the contrast of interferogram to be a maximum, the phase shift required for PSI can be obtained by changing the injection current. Moreover, in such a condition, the PSI system works even mode hops occur. Theory and experimental results for measuring the transmitted wavefront of an aspheric DVD pickup lens are presented.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jun Chen, Yoh Tanaka, Suezou Nakadate, and Yukihiro Ishii "Phase-shifting interferometry using a multi-mode blue laser diode", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 715702 (2 February 2009);


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