Abstract
We report the observation of polarization self-modulation (PSM) in external-cavity semiconductor lasers. When a quarter wave retardation plate is inserted in a linear laser cavity, or a half wave plate in a ring laser cavity, the lasing field repetitively switches between the transverse electric (TE) and transverse magnetic (TM) polarizations at a rate determined by the cavity length. The speed is not limited by the relaxation oscillation frequency (fro), so this technique can be used for generating ultra-high frequency modulation in semiconductor lasers.
© 1990 Optical Society of America
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