Broad-area MOPA device with leaky waveguide beam expander

Details Broad-area MOPA device with leaky waveguide beam expander Broad-area MOPA device with leaky waveguide beam expander

1993-03-15

1994-09-20

Lee, John D.

Coherent light generators

Particular resonant cavity

Specified cavity component

359344, 359346, 372 50, 385 27, 385 43, H01S 308

Patent

active

053496027

ABSTRACT:
A coherent light source, such as a laser oscillator and a monolithic MOPA device, and a broad area light amplifying device, all characterized by having a leaky waveguide beam expander coupled thereto for expanding a single mode beam into a wide light beam in a coherent manner. The beam expander comprises an elongated antiguide core of a first refractive index and a radiated-wave receiving region of a higher refractive index to receive lightwaves laterally radiated from the antiguide core. This beam expander can be located at an output end of a single mode laser oscillator to receive and expand the beam, at an input end of a broad area optical power amplifier to allow the amplifier to accept a narrow input beam, or between the laser oscillator and power amplifier in a MOPA device. The beam expander elements can also be located partially or entirely within the resonant optical cavity of a laser oscillator.

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