Semiconductor laser with integral spatial mode filter

Details Semiconductor laser with integral spatial mode filter Semiconductor laser with integral spatial mode filter

1993-01-07

1995-02-21

Bovernick, Rodney B.

Coherent light generators

Particular resonant cavity

372 45, 372 46, 372 50, 372 99, 372100, 372102, 372 20, 372 32, H01S 319

Patent

active

053923081

ABSTRACT:
A semiconductor laser having a light amplifying diode heterostructure with a flared gain region in an external resonant cavity. The flared gain region has a narrow aperture end which may be coupled to a single mode waveguide and a wide output end. A light emitting surface of the heterostructure proximate to the wide end of the flared gain region is partially reflective and combines with an external reflector to form a resonant cavity that is effectively unstable. The intracavity light-emitting surface proximate to the narrow aperture end is antireflection coated. The external reflector may be a planar mirror or a grating reflector. A lens or an optical fiber may couple the aperture end of the flared gain region to the external reflector. Frequency-selective feedback is provided by orienting the grating reflector or providing a prism in the cavity in front of the external planar mirror. Other filtering elements may also be placed in the external cavity. The flared gain region and waveguide may be differentially pumped or modulated with current provided by separate contacts.

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