Semiconductor laser array apparatus with adjustable phase plate

Details Semiconductor laser array apparatus with adjustable phase plate Semiconductor laser array apparatus with adjustable phase plate

1986-10-30

1988-08-16

Davie, James W.

Coherent light generators

Particular beam control device

Mode locking

372 19, 372 20, 372 36, H15

Patent

active

047649291

ABSTRACT:
A phase-locked semiconductor laser array in which the phase of oscillation of alternate laser elements is adjusted externally to the laser cavity. A phase plate having parallel ribs of tapered thickness is positioned in close proximity to the emitting facet of a laser array, and is adjusted in position until the ribs are registered with alternate laser elements, and the thickness presented to the emitted laser beams is sufficient to cause a phase change of 180 degrees. After light from the array has passed through the phase plate, the entire set of beams is in phase and produces a practically single-lobed far-field pattern.

REFERENCES:
patent: 3408596 (1968-10-01), Forward et al.
patent: 4641311 (1987-02-01), Ackley
W. Streifer et al., "Phased Array Diode Lasers," Laser Focus, Jun., 1984.
Peter R. Cross et al., "Dynamite Diodes," Photronics Spectra, Sep., 1984, pp. 79-86.

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