Coherent light generators – Particular active media – Semiconductor
Patent
1996-09-13
1999-09-28
Bovernick, Rodney
Coherent light generators
Particular active media
Semiconductor
H01S 319
Patent
active
059600217
ABSTRACT:
A diode laser present in an gas or vacuum atmosphere. The semiconductor body of the diode laser comprises two end faces which bound the resonant cavity within which radiation is generated in an active region. The active region forms part of an active layer situated between two cladding layers on a substrate. At least one end face is coated with a covering layer. The covering layer comprises at least two sub-layers of a first dielectricum with a first refractive index and of a second dielectricum with a second refractive index, respectively, and the optical thicknesses and refractive indices of the sub-layers are chosen such that the maximum intensity of the field strength of the generated radiation in the semiconductor body and the covering layer lies outside the end face, and preferably such that the intensity of the field strength of the generated radiation is approximately a minimum adjacent the end face. Preferably, the covering layer comprises two or three sub-layers of dielectric materials such as Al.sub.2 O.sub.3, Si.sub.3 N.sub.4, and SiO.sub.2, on an exit face. A very thin intermediate layer of Si or Al is preferably present between the semiconductor body and the covering layer. The invention also relates to a method of manufacturing such a diode laser.
REFERENCES:
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patent: 4951291 (1990-08-01), Miyauchi et al.
"Reliable high-power (40 mW) operation of transverse-mode stabilised InGaA1P laser diodes with strained active layer" by K. Nitta et al, published in Electron. Lett. vol. 28, No. 11, May 21, 1992, pp. 1069-1070.
"Further studies of the role of the electric field strength in laser damage of dielectric layers" by J.H. Apfel in Laser induced damage in optical materials: 1979, Boulde, CO, USA, Oct. 30, 1979, pp. 251-254.
"Computer aided techniques for the design of multilayer filters" by H. Liddell, Adam Hilger Ltd, Bristol, 1981, pp. 25-28.
De Vrieze Henricus M.
Hendrix Leonardus J. M.
Bovernick Rodney
Glenn Michael A.
Leung Quyen Phan
Uniphase Opto Holdings, Inc.
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