A phase-shifting interferometer with a laser diode has been studied that is insensitive to the changes in laser power associated with variation in current. The tested phase is measured by six interferograms by a newly developed phase-extraction algorithm. The phase is calculated from a least-squares fit to an interferogram. The systematic phase error that is due to the variation in laser output has been numerically investigated to have a periodicity of 2pi rad compared with the experimental result for the conventional phase-extraction algorithm. Good agreement between them is shown.
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Ishii et al. (1995) studied this question.
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