[54] SEMICONDUCTOR LASER DEVICE
[75] Inventors: Jun-ichi Umeda; Takashi Kajimura,
both of Hachioji, Japan
[73] Assignee: Hitachi, Ltd., Tokyo, Japan
[21] Appl. No.: 204,012
[22] Filed: Oct. 31,1980
[30] Foreign Application Priority Data
Nov. 9, 1979 [JP] Japan 54-144402
Oct. 8, 1980 [JP] Japan 55-142704[U]
[51] Int. C1.3 H01S 3/19
[52] U.S. CI 372/46; 357/17;
372/50
[58] Field of Search 331/94.5 H; 372/46,
372/50; 357/17
[56] References Cited
U.S. PATENT DOCUMENTS
4,219,785 8/1980 Scifres et al 331/94.5 H
4,251,780 2/1981 Scifres et al 331/94.5 H
FOREIGN PATENT DOCUMENTS
10949 5/1980 European Pat. Off. 331/94.5 H
OTHER PUBLICATIONS
Ikegami et al, "Planar Stripe with Waist/Notch (SWAN) Injection Laser", Electronics Letters, Nov. 23, 1978, vol. 14, No. 24, pp. 753-754. de Waard, "A Novel Single Mode Laser Having Periodic Variations in the Stripe Width (Super DFB), Conference Proceedings of the Optical Communication Con
ference", Amsterdam, Netherlands, 17-19 Sep. 1979, pp. 18.4-1-18.4-3.
Appl. Phys. Lett. 33(12), Dec. 15, 1978, pp. 1015-1017.
RCA Technical Notes, RCA TN No. 760, Apr. 1968.
Primary Examiner—James W. Davie
Attorney, Agent, or Firm—Kenyon & Kenyon
[57] ABSTRACT
Disclosed is a semiconductor laser element having on a predetermined semiconductor substrate a stacked region for optical confinement including an active layer and clad layers, a first electrode disposed on the semiconductor substrate side and a second electrode disposed over the stacked region, and means for constructing an optical resonator, the semiconductor laser element comprising the fact that the means to inject current into the active layer is formed of a plurality of stripe conductive regions which are juxtaposed in traveling direction of a laser beam, and that laser radiations emitted in correspondence with the respective stripe conductive regions form a simply connected net and give rise to nonlinear interactions among them. As a typical example of the current injection means, the conductive regions have a strip-shaped pattern which includes a broader portion and a narrower portion. A coupled-multiple-stripe laser element in which the phases and wavelengths of the laser radiations of the respective strips are uniform is realized.
6 Claims, 16 Drawing Figures
