Apparatus comprising a laser adapted for emission of single mode

Details Apparatus comprising a laser adapted for emission of single mode Apparatus comprising a laser adapted for emission of single mode

1990-12-20

1992-02-11

Epps, Georgia

Coherent light generators

Particular active media

Semiconductor

372 96, H01S 319

Patent

active

050880993

ABSTRACT:
Disclosed is an edge-emitting semiconductor laser that has a single waveguiding structure, and that comprises means for reducing the transverse divergence of the far-field pattern of the laser emission. Typically these means comprise reflecting means (preferably transverse distributed Bragg reflectors) disposed parallel to the junction plane of the laser. Lasers according to the invention can have a highly stable single mode output having a substantially symmetrical far field pattern. Disclosed is also an advantageous method of making ridge-waveguide lasers that can, inter alia, be used to make lasers according to the invention. The method is a self-aligned method that does not comprise any critical alignment steps. Thus it is useful for making lasers that have a very narrow ridge waveguide. Such lasers are desirable because they can suppress lateral higher order modes.

REFERENCES:
patent: 4908833 (1990-03-01), Chraplyvy et al.
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"Efficient Power Coupling from a 980-nm, Broad-Area Laser to a Single-Mode Fiber Using a Wedge-Shaped Fiber Endface", by V. S. Shah et al., Journal of Lightwave Technology, vol. 8, No. 9, Sep. 1990, pp. 1313-1318.
"Single-Quantum-Well Laser with 11.2 Degree Transverse Beam Divergence", by Y. C. Chen et al., Electronics Letters, vol. 26, Aug. 16, 1990, pp. 1348-1350.
"Electromagnetic Propagation in Periodic Stratified Media, I. General Theory*", by P. Yeh et al., J. Opt. Soc. Am., vol. 67, No 4, Apr. 1977, pp. 423-438.
"Optical Surface Waves in Periodic Layered Media.sup.a) ", by Y. Cho, Applied Physics Letters, 32(2), Jan. 15, 1978, pp. 104-105.

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