Coherent light generators – Particular active media – Semiconductor
Patent
1992-05-14
1994-05-03
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 45, 372 46, 372 92, 372 99, H01S 319
Patent
active
053094689
ABSTRACT:
A laser diode for producing an optical beam in a direction substantially perpendicular to epitaxial layers. The laser diode comprises a substrate, a disc-shaped active layer provided epitaxially on the substrate for producing an optical beam as a result of the stimulated emission, a disc-shaped contact layer provided epitaxially on the active layer for injecting carriers into the active layer, an optical confinement layer provided on the substrate to surround the active layer and the contact layer laterally for confining the optical beam in the active layer, a convex mirror part provided on a lower major surface of the substrate for reflecting back the optical beam such that the optical beam is converged to the active layer, an opposing mirror part provided in correspondence to an upper major surface of the contact layer, a first electrode provided on the contact layer for injecting carriers of a first polarity, a second electrode provided on the lower major surface of the substrate for injecting carriers of a second polarity, and an optical passage provided in correspondence to the spherical surface of the convex lens part for emitting the optical beam as a parallel beam.
REFERENCES:
patent: 4935939 (1990-06-01), Liau et al.
Jack Jewell et al., "Microlasers", Scientific American, Nov. 1991 pp. 86-94.
S. Uchiyama et al., "GainAsP/InP Surface-Emitting Lasers with Current Confining Structure," Journal of Lightwave Technology, vol. LT-4, No. 7, Jul. 1986, New York, NY, pp. 846-850.
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Patent Abstracts of Japan, vol. 13, No. 381 (E-810) Aug. 23, 1989 & JP-A-1 130578 (Iwasaki Electric Ind) May 23, 1989.
Patent Abstracts of Japan, vol. 14, No. 336 (E-953) Jul. 19, 1990 & JP-A-2 113524 (Hitachi Ltd) Apr. 25, 1990.
K. Rastani et al., "Arrays of Focused Beams Generated by the Integration of Fresnel Microlenses with Vertical Cavity Surface-Emitting Laser Arrays," Technical Digest Series, Spatial Light Modulators and Applications Topical Meeting, Optical Society of America, vol. 14, Sep. 10, 1990, Washington, DC, pp. 76-79.
M. Makiuchi et al., "High-Speed Monolithic GalnAs Twin PIN Photodiodes for Coherent Optical Receivers," Fujitsu-Scientific and Technical Journal, vol. 27, No. 1, Apr. 1991, Kawasaki, JP, pp. 84-90.
Davie James W.
Fujitsu Limited
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