Coherent light generators – Particular active media – Semiconductor
Patent
1996-11-08
1998-04-07
Lee, John D.
Coherent light generators
Particular active media
Semiconductor
359344, 372 92, H01S 306
Patent
active
057373523
ABSTRACT:
The invention relates to a III-V laser (amplifier) with an active region (4A) which encloses a small angle with the end faces (50, 51), is separated therefrom by a preferably current-blocking cladding layer (5) and has a tapering end (40) of which a first side face (42) coincides with a side face (42) of the remainder of the strip-shaped active region (4A), while a second side face (43) thereof encloses an acute angle with the perpendicular to the end faces (50, 51). Such a laser has an amplification ripple, which is undesirable. In a laser according to the invention, the second side face (43) of the tapering portion (40) encloses an angle with the perpendicular to the end face (50, 51) which lies between 0.degree. and 30.degree., preferably between 0.degree. and 10.degree., and which is preferably approximately 0.degree.. The laser according to the invention has a particularly low reflection, as a result of which said amplification ripple is absent or at least very small. No differences in growing processes against said side faces occur since both the first and the second side face (42, 43) of the active region (4A) are mutually substantially parallel. Accordingly, the laser is preferably of the buried hetero type. In that case, the growth around the active region (4A) is very homogeneous, which benefits the yield and quality of the lasers. The laser is preferably constructed as an amplifier, for which purpose the end faces (50, 51) are provided with an anti-reflection layer. The invention, finally, also relates to a method by which the desired laser is obtained in a simple manner.
REFERENCES:
patent: 4432091 (1984-02-01), Kuroda et al.
patent: 4856014 (1989-08-01), Figueroa et al.
patent: 4901123 (1990-02-01), Noguchi et al.
Binsma Johannes J. M.
Thijs Petrus J. A.
Tiemeijer Lukas F.
Kang Ellen Eunjoo
Lee John D.
Tierney Daniel E.
U.S. Philips Corporation
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