Laser array with wide-waveguide coupling region

Details Laser array with wide-waveguide coupling region Laser array with wide-waveguide coupling region

1986-10-21

1989-07-25

Davie, James W.

Coherent light generators

Particular active media

Semiconductor

372 46, 372 48, H01S 319

Patent

active

048521132

ABSTRACT:
A semiconductor laser array that discriminates in favor of a fundamental array mode of oscillation and provides a far-field radiation pattern that is single lobed and diffraction-limited. The array includes a first set of parallel waveguides, a wide-waveguide section and a second set of parallel waveguides. Oscillation in the fundamental or 0.degree.-phase-shift array mode is easily coupled from the first set of waveguides to the wide-waveguide section, and from the wide-waveguide section to the second set of waveguides. When adjacent waveguides oscillate out of phase, as in the 180.degree.-phase-shift array mode, easy coupling is not obtained because the waveguides of the second set are not colinear with those of the first set. The structure of the invention also avoids the large radiation losses inherent in Y-junction arrays.

REFERENCES:
patent: Re31806 (1985-01-01), Scifres et al.
patent: 4723252 (1988-02-01), Botez et al.
patent: 4772082 (1988-09-01), Matsui et al.
Kuo-Liang Chen & Shyh Wang, "Single-Lobe Symmetric Coupled Laser Arrays," Electron. Lett., vol. 21, No. 8, pp. 347-349, 11 Apr., 1985.
Kuo-Liang Chen & Shyh Wang, "Analysis of Symmetric Y-Junction Laser Arrays with Uniform Near-Field Distribution," Electron. Lett., vol. 22, No. 12, pp. 644-645, 5 Jun., 1986.

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