摘要:
A semiconductor laser comprising a substrate for crystal growth having a striped channel, an active layer for laser oscillation, a cladding layer containing Mg which is in contact with said active layer at the side of said striped channel substrate.
摘要:
A semiconductor laser device is disclosed which emits laser light from a facet. The semiconductor laser device comprises a multi-layered structure formed on a semiconductor substrate, the multi-layered structure having an AlGaAs active layer for laser oscillation, and a protective film formed on the facet, wherein a film containing sulfur is provided between the facet and the protective film.
摘要:
A semiconductor laser device is disclosed which emits laser light from a facet. The semiconductor laser device comprises a multi-layered structure formed on a semiconductor substrate, the multi-layered structure having an AlGaAs active layer for laser oscillation, and a protective film formed on the facet, wherein a film containing sulfur is provided between the facet and the protective film.
摘要:
A window VSIS semiconductor laser includes a stimulated region and window regions formed on both ends of the stimulated region. A V-shaped groove is formed in a substrate, and an active layer is formed on the substrate. In one preferred form, the V-shaped groove has a wider width in the stimulated region as compared with the V-shaped groove formed in the window regions. The active layer is a crescent active layer in the stimulated region. One edge of the V-shaped groove in the stimulated region is continuously aligned on a line to the corresponding edge of the V-shaped groove formed in the window regions so as to enhance the optical coupling. In another preferred form, indents are formed in the substrate in the window regions in a manner to sandwich the V-shaped groove formed in the window regions. The V-shaped groove has the same width in the stimulated region and in the window regions. The active layer is plane shaped in the stimulated region, and a thickness of the active layer in the stimulated region is thicker than the active layer formed in the window regions.
摘要:
A semiconductor laser comprising a substrate having a two step-striped channel; and a double heterostructure-laser-operating area having successively a cladding layer, an active layer and a second cladding layer on the substrate. The two step-striped channels are composed of a first channel and a second channel having a width which is narrower than the width of the first channel and having a depth which is deeper than the depth of the first channel. The second channel is positioned in the center portion of the first channel, thereby allowing current injected into the active layer to flow into the center portion of the two step-striped channel.
摘要:
A semiconductor laser device is disclosed which emits laser light from an end facet. The semiconductor laser device comprises a multi-layered structure formed on a semiconductor substrate, the multi-layered structure having an active layer for laser oscillation, and a pair of cleavage planes on the side of the multi-layered structure, wherein a graded-band-gap layer is formed on at least one of the cleavage planes, the graded-band-gap layer having a forbidden band gap which increases gradually with an increase in the distance from the cleavage plane, and the surface of the graded-band-gap layer constituting the end facet.
摘要:
A window semiconductor laser device comprising a stripe-channeled substrate, an active layer for laser oscillation and a cladding layer disposed under the active layer, wherein the surface of the active layer is flat and the thickness of the portion of the active layer corresponding to the striped channel of said substrate in each of the window regions in the vicinity of the facets is thinner than that of the portion of the active corresponding to the striped channel of said substrate in the stimulated region positioned between the window regions.
摘要:
A compound resonator type semiconductor laser device comprising a multiple-layered crystal structure having a first laser operation area which contains a resonator for laser oscillation and a second laser operation area which contains a resonator a facet of which is shared with that of the resonator in the first laser operation area; and an electric current feeder for injecting a current into said multiple-layered crystal structure, and wherein said facet of the resonator in the first laser operation area, which is shared with the facet of the resonator in the second laser operation area, is covered with a protective film to attain a high reflectivity therein, the other facet of the resonator in the first laser operation area is covered with a protective film to attain a low reflectivity therein, and the other facet of the resonator in the second laser operation area is covered with a protective film to attain a high reflectivity therein.
摘要:
An internal-reflection-interference semiconductor laser device comprising a first laser operation area ranging from one facet to the internal reflecting section and a second laser operation area ranging from the other facet to the internal reflecting section, wherein when the internal-cavity length l.sub.1 of the first laser operation area is shorter than the internal-cavity length l.sub.2 of the second laser operation area, the reflectivity R.sub.1 at the facet on the side of the first laser operation area is smaller than the reflectivity R.sub.2 at the facet on the side of the second laser operation area.
摘要:
A V-channel inner stripe semiconductor laser device comprising a multi-layered growth crystal having an active layer for laser oscillation but no substrate, with a buffer layer formed on the multi-layered growth crystal thicker than all of the layers of the growth crystal, where the multi-layered growth crystal and buffer layer are sandwiched between an n-sided electrode and a p-sided electrode, wherein a pair of mesa-striped channels are formed outside of the V-channel to remove the outside of the optical waveguide formed in the active layer corresponding to the V-channel.