Abstract
A theoretical model that explains the fringe-locking phenomenon in a two beam laser diode interferometer with optical feedback has been proposed. The dependence of wavelength on the change of the optical path difference of the interferometer is calculated using the model, which leads to results that agree well with those of experiments. The fringe locking is caused by the change of lasing wavelength that suppresses the path difference change to much less than 2π. The calculated rms phase fluctuations agree well with those measured experimentally.
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