Polarization switchable quantum well laser

Details Polarization switchable quantum well laser Polarization switchable quantum well laser

1992-09-22

1995-03-07

Bovernick, Rodney B.

Coherent light generators

Particular beam control device

Modulation

372 45, 372 50, H01S 318, H01S 3102

Patent

active

053965086

ABSTRACT:
A QW diode laser whose polarization can be switched. In one embodiment, the device incorporates a tensile strained quantum well active region, whose thickness is adjusted so that the heavy hole and light hole band edges are of the same energy. Since the heavy hole transition provides TE-mode gain, while the light hole band provides mostly TM-mode gain, the resulting laser polarization will be very sensitive to the threshold carrier density. With an intracavity loss modulator in such a structure, the polarization could be switched. Other switching techniques are also described.

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