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A new class of instabilities is reported in a semiconductor laser which is coupled to an external optical cavity with an intracavity Fabry–Perot etalon. Power spectra of the laser suggest periodic oscillation and its subharmonic modulations. The calculated results, using the van der Pol equation which includes a carrier density-dependent refractive index, are outlined to explain the observed subharmonic modulation phenomena.
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Kawaguchi et al. (1984) studied this question.
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