Coherent light generators – Particular active media – Semiconductor
Patent
1988-08-18
1989-09-12
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 46, 372 48, H01S 319
Patent
active
048667242
ABSTRACT:
A semiconductor laser diode array structure in which interelement losses are deliberately included, to favor operation at higher-order array modes of operation, and thereby avoid the disadvantage of beam broadening that results when lower-order array modes of operation are used at very high drive currents. To provide a desirable far-field radiation pattern, the structure includes a wide-waveguide interferometric configuration to select only the lowest of the higher-order modes. The desired interelement losses are obtained in the illustrative embodiment by a buffer layer that provides antiguiding in a transverse direction, but only in the interelement regions. The buffer layer is transparent, for strong interelement coupling and stability of operation. The illustrative embodiment was operated at drive currents in excess of four times threshold current, and with beam broadening only slightly above the diffraction limit.
REFERENCES:
patent: 4641311 (1987-02-01), Ackley
patent: 4723252 (1988-02-01), Botez et al.
patent: 4764929 (1988-08-01), Thaniyavarn
patent: 4772082 (1988-09-01), Matsui et al.
Botez Dan
Mawst Luke J.
Davie James W.
Goldstein Sol L.
Heal Noel F.
TRW Inc.
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