Coherent light generators – Particular resonant cavity – Specified output coupling device
Patent
1993-01-28
1994-06-14
Healy, Brain
Coherent light generators
Particular resonant cavity
Specified output coupling device
372 21, 372 22, 372 23, 372 43, 372 50, 372 99, 372101, 359326, 359328, 359333, 359344, 359346, H01S 308, H01S 310
Patent
active
053217187
ABSTRACT:
A compact semiconductor laser light source providing short wavelength (ultraviolet, blue or green) coherent light by means of frequency doubling of red or infrared light from a high power diode heterostructure. The high power diode heterostructure is a MOPA device having a single mode laser oscillator followed by a multimode, preferably flared, optical power amplifier. A tunable configuration having an external rear reflector grating could also be used. A lens could be integrated with the MOPA to laterally collimate the light before it is emitted. Straight or curved, surface emitting gratings could also be incorporated. An astigmatism-correcting lens system having at least one cylindrical lens surface is disposed in the path of the output from the MOPA to provide a beam with substantially equal lateral and transverse beam width dimensions and beam divergence angles. A nonlinear optical crystal or waveguide is placed in the path of the astigmatism-free symmetrized beam to double the frequency of the light. Single pass or multipass configurations with reflectors could be used, as well as external resonator and segmented, periodically poled waveguide configurations.
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Lang Robert J.
Nam Derek W.
Scifres Donald R.
Waarts Robert G.
Welch David F.
Healy Brain
SDL Inc.
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