Laser cavity optical system for stabilizing the beam from a phas

Details Laser cavity optical system for stabilizing the beam from a phas Laser cavity optical system for stabilizing the beam from a phas

1985-02-04

1987-04-07

Scott, Jr., Leon

Coherent light generators

Particular resonant cavity

Specified cavity component

372 9, 372 99, 372101, 350420, H01S 308

Patent

active

046566414

ABSTRACT:
A laser cavity optical system is provided for stabilizing the laser far field dominate lobe so that no beam shift occurs. The laser cavity optical system comprises a lens system positioned at one facet of a phased array semiconductor laser for imaging the near field pattern of the laser comprising a single beam waist position in a first spatial direction and reimaging the far field pattern in a second spatial direction after having first focused the far field pattern in the second spatial direction to a single beam waist position. The improvement in the laser cavity optical system comprises a partially reflecting, partially transmitting mirror located at the second spatial direction beam waist position to stabilize the laser beam and prevent laser beam shift at higher operating powers and operating temperatures. Feedback means provided in the system is capable of either spatially or angularly discriminating relative to far field lobes present in a portion of said reflected light output. The mirror may also be a wavelength selective filter. Further, a slit aperture may be located at the second spatial direction beam waist position to limit the angle of aperture of the beam and thereby cutoff second, less dominate lobes present in the far field. Means to control the wavelength of the emission from the laser, such as a grating, prism, or spectral filter, may be provided in an external optical cavity at the other laser facet to provide wavelength selective reflection.

REFERENCES:
patent: 3701044 (1972-10-01), Paoli et al.
patent: 3974507 (1976-08-01), Chemelli et al.
patent: 4203652 (1980-05-01), Hanada
patent: 4253735 (1981-03-01), Kawamura et al.
patent: 4255717 (1981-03-01), Scifres et al.
patent: 4318594 (1982-03-01), Hanada
patent: 4323297 (1982-04-01), Kawamura et al.
patent: 4530574 (1985-07-01), Scifres et al.
D. R. Scifres et al. "Phase-Locked Semiconductor Laser Array", Applied Physics Letters, vol. 33(12), pp. 1015-1017.

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