摘要:
A semiconductor laser device has a laser-oscillating optical waveguide (1) composed of a control region (2) which functions to absorb light and main regions (3) which function to oscillate laser light, said control region (2) being positioned in the centre portion of said optical waveguide (1) and said main regions (3) being positioned on both ends of said control region (2), wherein said laser device further comprises a shunting means (Rg) by which the ratio of the current Ig flowing to said control region to the total current It injected into said laser device is set to meet the inequality (1): wherein Lg is the length of said control region and Lt is the length of said optical waveguide.
摘要:
A compound resonator type semiconductor laser device comprises 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, 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:
The present invention provides a semiconductor laser device with a protective film (B,F) on the facets (2,5), wherein said protective film is made of a multi-layered dielectric film composed of alternate layers consisting of at least two kinds of dielectric film, one of which is a first dielectric film (31) of low refractive index and the other of which is a dielectric film (42) of high refractive index, said multi-layered dielectric film (F) which covers at least one of the facets (2) being a light-permeable film with a reflectivity of 30% or less.
摘要:
A semiconductor laser includes a front mirror facet and a rear mirror facet. An A1 2 O 3 film coating is formed on the front mirror facet by the electron beam evaporation technique so that the front mirror facet has the reflectance between 10 and 20%. A multi-layered coating is formed on the rear mirror facet so that the rear mirror facet has the reflectance higher than 90%.
摘要:
A compound resonator type semiconductor laser device comprises 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, 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:
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 35 % of the entire thickness of the GaAs semiconductor laser element, thereby minimizing the stress applied to the active layer.
摘要:
An external cavity type semiconductor laser apparatus comprises a semiconductor laser device (1) and an external cavity (2), which are mounted on a single mounting base (3) with a space therebetween, wherein laser light emitted from the light-emitting rear facet (6) of the laser device is reflected by the external cavity (2) and returns to the laser device (1), the reflectivity of the light-emitting rear facet (6) of the laser device (1) being different from that of the light-emitting front facet (5) of the laser device (1).