Abstract: A semiconductor laser array device comprising a structure for minimizing the dependence of the longitudinal mode of laser oscillation upon the driving electric current, thereby facilitating laser light oscillation at a high output power with a zero degrees phase shift between adjacent lasing elements.

Abstract: 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.

Abstract: A semiconductor laser comprising a middle-positioned active layer sandwiched between the lower-positioned active layer and the upper-positioned active layer, the refractivity of each of said lower- and upper- positioned active layers being slightly different from that of the middle-positioned active layer.

Abstract: A semiconductor laser array which includes a plurality of active wave guide in a substantially parallel manner disposed on first and second laser opposing laser facets so as to be optically coupled and so that adjacent wave guides converse into one or more active wave guides on an opposing laser facet. The laser array exhibits stable operations and a high output power in a single narrow beam. The active wave guides have identical vertical modes and a phase difference of zero degrees.

Abstract: The laser device has a plurality of parallel index-waveguides. The intermediate regions of the waveguides are at an angle of inclination from a line perpendicular to each of both facets of the laser device. The ends of the waveguides are oriented orthogonally to the facets of the laser device.

Abstract: A semiconductor laser array device comprising a plurality of index-guided lasing filaments formed in an active layer in a parallel manner, and an electrical current injection portion formed on the upper face of grown layers therefor the flat shape of the electrical current injection portion is asymmetrical with respect to any line which is parallel to the lasing filaments.

Abstract: A visible double heterostructure-semiconductor laser comprising an InGaAs, InAlP, InAlAs, InAlSb or InGaSb layer, a first cladding layer on the InGaAs, InAlP, InAlAs, InAlSb or InGaSb layer; an active layer on the first cladding layer and a second cladding layer on the active layer, wherein a mixed crystal of, respectively InGaAs, InAlP, InAlAs, InAlSb or InGaSb is used, as a substrate crystal for growing of said InGaAs, InAlP, InAlAs, InAlSb or InGaSb layer thereon, and the composition ratio of the substrate crystal and of each of the layers is selected so as to result in the approximate coincidence between the lattice constant of the substrate crystal and the lattice constant of each of these layers, an energy difference of 0.2 eV or more between the direct transition and the indirect transition within said active layer, and an energy difference of 0.2 eV or more between the active layer and either of the first or the second cladding layers.

Abstract: A semiconductor laser array includes a p-GaAs substrate, a p-Ga.sub.1-x Al.sub.x As cladding layer, a Ga.sub.1-y Al.sub.y As active layer, an n-Ga.sub.1-z Al.sub.z As optical guide layer, an n-Ga.sub.1-x Al.sub.x As cladding layer and an n-GaAs cap layer formed by the liquid phase epitaxial growth method. A plurality of stripe shaped grooves are formed in the surface of the n-GaAs cap layer so that the bottom of the groove reaches the intermediate of the n-Ga.sub.1-z Al.sub.z As optical guide layer. A Ga.sub.1-b Al.sub.b As high resistance layer is filled in the plurality of stripe shaped grooves so that injecting current is divided into a plurality of paths, and each laser emitting region is optically, phase coupled to each other with a phase difference of zero degree.

Abstract: 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.

Abstract: 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.

Abstract: A GaAlAs semiconductor laser element includes a Ga.sub.1-x Al.sub.x As active layer sandwiched by a first and second Ga.sub.1-y Al.sub.y As cladding layers. A Ga.sub.1-z Al.sub.z As substrate layer supports the first cladding layer, and a Ga.sub.1-z Al.sub.z As cap layer covers the second cladding layer. The AlAs mole fraction (z) of the substrate layer and the cap layer is selected slightly smaller than the AlAs mole fraction (x) of the active layer. Further, the active layer is located in the laser element so that the active layer is separated from the mounted surface by more than 35% of the laser element thickness, and is separated from the opposing surface by more than 18% of the laser element thickness.

Abstract: A V-channeled substrate inner stripe (VSIS) laser is manufactured on a GaAs substrate. The VSIS laser includes p-Ga.sub.0.7 Al.sub.0.3 As active layer, and an n-Ga.sub.0.85 Al.sub.0.15 As cap layer. The GaAs substrate is removed from the final device. The n-Ga.sub.0.85 Al.sub.0.15 As cap layer functions to support the final device, and to minimize a stress applied to the p-Ga.sub.0.7 Al.sub.0.3 As active layer.

Abstract: A GaAs semiconductor laser includes a GaAs semiconductor laser element, and a Cu heat sink attached to the GaAs semiconductor laser element through the use of an In solder. The GaAs semiconductor laser element includes an active layer sandwiched by cladding layers, and a substrate upon which various layers are formed. The GaAs semiconductor laser element is constructed so that the active layer is separated from the mounted surface by at least a distance which corresponds to about 32 to 35% of the entire thickness of the GaAs semiconductor laser element, thereby minimizing the stress applied to the active layer.

Abstract: A method for the production of semiconductor lasers comprising: (a) forming a substrate having a striped portion on its face, said striped portion being formed into a mesa, (b) forming a current blocking layer on each of said striped portion and the remaining face of said substrate, (c) eliminating said current blocking layer only on said striped portion thereby allowing electric current to flow through the substrate and form said striped portion into a terrace or a groove, as a whole, and (d) successively laminating crystal growth layers for laser operation on the whole face of the substrate in strict conformity with said terrace or groove on the face of said substrate, thereby attaining stabilization of the transverse mode of laser oscillation.

Abstract: A window V-channeled substrate inner stripe semiconductor laser which includes window regions formed at both ends of a stimulated region. The stimulated region includes a crescent active layer, and each of the window regions includes a plane active layer for transferring the laser beam emitted from the stimulated region to the mirror. The window regions ensure a stable operation of the laser oscillation and a high optical power for catastrophic optical damage.

Abstract: A window V-channeled substrate inner stripe semiconductor laser includes window regions formed at both ends of a stimulated region. The stimulated region includes a crescent active layer, and each of the window regions includes a plane active layer for transferring the laser beam emitted from the stimulated region to the mirror. An optical guide layer is formed on said crescent and plane active layers in order to ensure a stable operation of the window structure semiconductor laser.