摘要:
An apparatus for measuring the reflectivities of the resonator facets of a semiconductor laser when the facets are covered with a protective coating of dielectric material or the like, which comprises photodetector means for individually measuring the laser light powers from both facets of the resonator, reflector means for reflecting the laser light from one of the facets back to the laser, shutter means openable or closable at a position to block the laser light reflected from the reflector means, and photodetector means for measuring the power of the reflected laser light.
摘要:
Copper phthalocyanines are produced by reacting a phthalic anhydride or phthalimide with a copper compound and urea in the presence of a catalyst in a polyalkyl-monochlorobenzene having at least two lower alkyl groups and having the formula ##STR1## wherein R.sub.1 and R.sub.2 respectively represent a lower alkyl group having 1 to 3 carbon atoms; R.sub.3 and R.sub.4 respectively represent hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms.
摘要:
In an AlGaInP type semiconductor light-emitting device, an n-type AlGaInP cladding layer and a p-type AlGaInP cladding layer are deposited so as to interpose an active layer made of GaInP or AlGaInP therebetween. Light guiding layers are provided between the active layer and the n-type cladding layer, and/or, between the active layer and the p-type cladding layer, respectively. The p-type cladding layer is doped with Be serving as a p-type dopant. The active layer, the p-type cladding layer and the light guiding layers are doped with Si which may serve as an n-type dopant.
摘要:
A semiconductor laser device comprising a GaAlAs first cladding layer, a Ga.sub.1-x Al.sub.x As (0.ltoreq.x.ltoreq.0.4) active layer for laser oscillation, an In.sub.1-y Ga.sub.y P.sub.1-z As.sub.z (z=2.04y-1.04, and 0.ltoreq.z.ltoreq.1) optical guiding layer with a diffraction grating thereon, a GaAlAs buffer layer disposed between said active layer and said optical guiding layer, and a GaAlAs second cladding layer, the width of the forbidden band of said buffer layer being greater than that of the active layer and smaller than that of the optical guiding layer.
摘要翻译:包括GaAlAs第一包层,用于激光振荡的Ga1-xAlxAs(0≤x≤0.4)有源层,In1-yGayP1-zAsz(z = 2.04y-1.04和0)的半导体激光器件, = z 1)具有衍射光栅的光导层,设置在所述有源层和所述光导层之间的GaAlAs缓冲层和GaAlAs第二包层,所述缓冲层的禁带的宽度更大 比活性层的厚度小,而且比光导层的面积小。
摘要:
A semiconductor laser device for laser oscillation at a wavelength in the range of from 660 nm to 890 nm which includes an active layer of Ga.sub.1-x Al.sub.x As (0.ltoreq.x.ltoreq.0.4) or In.sub.1-y Ga.sub.y P.sub.1-z As.sub.z (0.51.ltoreq.y.ltoreq.1, 0.ltoreq.z.ltoreq.1, and z=2.04y-1.04) and a layer with a diffraction grating thereon of In.sub.1-y Ga.sub.y P.sub.1-z As (z=2.04y-1.04) which is adjacent to the active layer.
摘要翻译:用于在660nm至890nm范围内的波长的激光振荡的半导体激光器件,其包括Ga1-xAlxAs(0≤x≤0.4)或In1-yGayP1-zAsz有效层(0.51 < = y 1 = 0,0 / z = 1,z = 2.04y-1.04)和其上具有In1-yGayP1-zAs(z = 2.04y-1.04)的衍射光栅的层,其相邻 到活动层。
摘要:
1,2-Benzoisothiazole-3-on-1, 1-dioxide having the formula ##STR1## wherein X represents hydrogen, halogen, nitro, lower alkyl or lower alkoxy and Y represents hydrogen, halogen, lower alkyl, or lower alkoxy is prepared by reacting phosgene with an o-sulfobenzoic acid compound having the formula: ##STR2## or an alkali metal salt or alkaline earth metal salt thereof in the presence of dimethylformamide, thereby producing a mixture of a dichlorotolylsultone and a chlorosulfonylbenzoylchloride; (b) reacting the reaction products of step (a) with an alcohol of the formula ROH wherein R represents a lower alkyl group; and then (c) reacting the product of step (b) with ammonia.
摘要:
On a GaAs substrate (Al.sub.Y Ga.sub.1-Y).sub.0.5 In.sub.0.5 P crystal layers (0.ltoreq.Y.ltoreq.1) is formed to be lattice-matched with the substrate. By radiating As molecular beams on the surface of the crystal layers while heating the layered substrate to a temperature at which In in the crystal layers evaporates, the portion near the surface of the crystal layers is changed into an Al.sub.Y Ga.sub.1-Y As crystal layer (0.ltoreq.Y.ltoreq.1) of a thickness of several molecules, on which layer an Al.sub.X Ga.sub.1-X As crystal layer (0.ltoreq.X.ltoreq.1) is formed. Since the surface of the Al.sub.Y Ga.sub.1-Y As crystal layer has been purified, the formed Al.sub.X Ga.sub.1-X As crystal layer has a high crystallinity, allowing production of a light emitting diode, a semiconductor laser device and the like with high efficiency.
摘要:
A method for the formation of a diffraction grating on a substrate using a holographic technique and an etching technique, wherein the periodicity of the pattern of the diffraction grating can be changed at will by a change of the light-path length of one of the two light fluxes from a holographic exposing system.
摘要:
A buried type semiconductor laser device comprising a multi-layered epitaxial growth crystal including a striped laser-oscillation operating area on a semiconductor substrate, wherein said laser-oscillation operating area contains a buffer layer having the same polarity as said substrate, an active layer and a cladding layer having a polarity different from that of said substrate, said laser-oscillation operation area being sandwiched between one part of the burying layer and another part of the burying layer, which are disposed on said substrate and which have a polarity different from that of said substrate, through said substrate or a diffusion region having an impurity with the same polarity as said substrate so as to electrically isolate said burying layer from said cladding layer, thereby maintaining ineffective current flowing from said cladding layer to said burying layer at a low level even when current injected into said device is increased.
摘要:
A method for the production of semiconductor devices comprising introducing source gases, etching gases or source molecules into a substrate to grow crystalline layers on said substrate or to etch said substrate, resulting in a semiconductor device, wherein said method further comprises applying a given electric potential to said substrate; applying an electric potential that is different from that of said substrate to an electron-beam irradiator disposed directly above said substrate; and irradiating said irradiator with electron beams from an electron-beam emitting means, whereby said substrate is irradiated with the secondary electron beams generated from said irradiator and/or with the electron beams transmitted through said irradiator.