Abstract
Polarization bistability between the transverse electric (TE) and transverse magnetic (TM) modes is observed in an external cavity semiconductor laser. Hysteresis in the polarization-resolved output power is obtained by controlling the optical feedback power of the TE mode via an intracavity electro-optic modulator. Transitions between single external-cavity frequencies of TE and TM modes are also demonstrated. Nonlinear gain saturation is the origin of this bistability.
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