Multibeam semiconductor laser array

Details Multibeam semiconductor laser array Multibeam semiconductor laser array

1992-06-25

1994-04-19

Epps, Georgia Y.

Coherent light generators

Particular active media

Semiconductor

372 48, 372 49, H01S 319

Patent

active

053053427

ABSTRACT:
Disclosed is a multibeam semiconductor laser array serving as a light source which is able to perform writing operations simultaneously by means of a plurality of laser beams. The multibeam semiconductor laser array includes a substrate; a plurality of semiconductor laser elements respectively provided on the substrate and drivable independently of one another; a fist window area disposed on a first end surface of a cavity forming the semiconductor laser elements, having a band cap wider than that of an active material layer of the semiconductor laser element, and not excitable electrically; a low reflectance coating applied to the first window area for reducing an optical reflectance; and a high reflectance coating disposed on a second end surface of the cavity forming the semiconductor laser elements for increasing the optical reflectance. According to the thus constructed multibeam semiconductor laser array, an optical cross talk can be eliminated, and a laser oscillation threshold value and a thermal cross talk can be minimized.

REFERENCES:
patent: 4747109 (1988-05-01), Taneya et al.
patent: 4977570 (1990-12-01), Hasegawa
R. L. Thornton et al, "High power (2.1 W) 10-stripe AlGaAs laser arrays with Si disordered facet windows," Appl. Phys Lett. 49 (23), Dec. 8, 1986, pp. 1572-1574.
Robert L. Thornton et al, "Properties of closely spaced independently addressable lasers fabricated impurity-induced disordering," Appl. Phys. Lett. 56 (17), Apr. 23, 1990, pp. 1623-1625.
N. Shimada et al, "Improvement in Droop Characteristics of Visible Light Laser Diode," The Japan Society of Applied Physics (Abstract), 1987, p. 973.
Y. Bessho et al, "790 nm. High-Power Eight-Beam AlGaAs Semiconductor Laser," The Japan Society of Applied Physics (Abstract), 1991, p. 1030.
Setsuko Murata et al, "Experiments of improving 50-.mu.m-spaced 8-beam laser diode array characteristics by adding a heat-pass-wire," The Japan Society of Applied Physics (Abstract) 1991, p. 1030.

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