Semiconductor laser

Details Semiconductor laser Semiconductor laser

1985-10-04

1988-02-16

Davie, James W.

Coherent light generators

Particular resonant cavity

Distributed feedback

372 46, H01S 319

Patent

active

047260319

ABSTRACT:
A semiconductor laser including a stripe-shaped active layer, a clad region, and a diffraction grating. The stripe-shaped active layer has a thickness in a first direction, has a first energy gap, and extends in a second direction orthogonal to the first direction. The clad region surrounds the stripe-shaped active layer, and has a second energy band gap greater than the first energy band gap. The diffraction grating is provided in parallel with and adjacent to, the stripe-shaped active layer. The stripe-shaped active layer has a first portion with a first light propagation constant and with a first dimension in a third direction orthogonal to the first and second directions, and has a second portion with a second light propagation constant and with a second dimension in the third direction. The first dimension and the second dimension are different from each other. The second portion has a length L in the second direction. The stripe-shaped active layer satisfies the condition that a product of .DELTA..beta. and L is an odd multiple of .pi./2, where .DELTA..beta. is a difference between the first and second light propagation constants.

REFERENCES:
patent: 4096446 (1978-06-01), Haus et al.
Haus, "Antisymmetric Taper of Distributed Feedback Lasers", IEEE Journal of Quantum Electronics, vol. QE-12, No. 9, Sep. 1976, pp. 532-539.
Patent Abstracts of Japan, vol. 6, No. 140, Jul. 29, 1982, & JP-A-57 63 880.
Elektronics International, vol. 54, No. 23, Nov. 1981, "1.5 .mu.m Laser Operates at 23 Degree C", by Cohen, pp. 68-70.
Journal of Applied Physics, vol. 43, No. 5, May 1972, "Coupled-Wave Theory of Distributed Feedback Lasers", by H. Kogelnik et al., pp. 2327-2335.
Electronics Letters, vol. 20, No. 2, Jan. 19, 1984, "Proposal of a Distributed Feedback Laser with Nonuniform Stripe Width for Complete Single-Mode Oscillation", Tada et al., pp. 82-84.
Electronics Letters, vol. 20, No. 24, Nov. 22, 1984, "GalNAsP/InP Phase-Adjusted Distributed Feedback Lasers with a Step-Like Nonuniform Stripe Width Structure", Soda et al., pp. 1016-1018.

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