Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1979-09-05
1981-05-26
Ozaki, G.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148172, 148175, 29569L, 29576E, H01L 21208
Patent
active
042696356
ABSTRACT:
A double heterostructure laser having a pair of opposite-conductivity-type, wide bandgap cladding layers separated by a narrower bandgap active region is characterized in that the active region includes a low-loss waveguide layer and contiguous therewith a narrower bandgap active layer in the form of a narrow strip which extends along the longitudinal (resonator) axis of the laser. Suitable lateral current confinement means, such as reversed biased p-n junctions, are provided to constrain pumping current to flow in a narrow channel through the active layer. Lasers of this type exhibit relatively high pulsed power outputs (e.g., 400 mW), linear L-I characteristics, stable fundamental transverse mode and single longitudinal mode oscillation. In another embodiment the surfaces of the waveguide layer adjacent the active layer are provided with distributed feedback gratings. Also described are techniques for shaping the active layer without the introduction of debilitating defects therein, as well as procedures for LPE growth on Al-containing Group III-V compound layers which are exposed to processing in the ambient.
REFERENCES:
patent: 3798139 (1974-03-01), Schwartz
patent: 3859178 (1975-01-01), Logan et al.
patent: 3865646 (1975-02-01), Logan et al.
patent: 3993963 (1976-11-01), Logan et al.
patent: 4008106 (1977-02-01), Gutierrez et al.
patent: 4028146 (1977-06-01), Logan et al.
Logan Ralph A.
Tsang Won-Tien
Bell Telephone Laboratories Incorporated
Ozaki G.
Urbano Michael J.
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