摘要:
A semiconductor laser device includes a substrate; a double hetero structure having an n-type cladding layer, an active layer, and a p-type cladding layer, which is formed on an upper face of the substrate; and electrodes formed on a lower face of the substrate and on an upper face of the double hetero structure, wherein the double hetero structure further includes a p-type hetero-barrier layer formed between the p-type cladding layer and the active layer, which is strained by compression due to a lattice mismatch.
摘要:
A method for fabricating an AlGaInP semiconductor light emitting device having a substrate and a multilayer structure including an AlGaInP first semiconductor layer formed on the substrate. The method comprises the steps of removing part of the multilayer structure so that the first semiconductor layer is exposed, irradiating with plasma beams an oxide film formed on the exposed first semiconductor layer with the substrate temperature being kept at 500.degree. C. or less, so as to remove the oxide film from the first semiconductor layer and growing a second semiconductor layer on the first semiconductor layer.
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 purl fled, 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.
摘要翻译:在GaAs衬底(AlYGa1-Y)上,形成与衬底晶格匹配的0.5In0.5P晶体层(0≤Y≤1)。 通过在层叠基板的加热的同时将As分子束照射到晶体层中的In蒸发的温度,将结晶层的表面附近的部分变更为AlYGa1-YAs晶体层(0 < / = Y <1),其上形成有AlXGa1-XAs晶体层(0≤X≤1)的几个分子的厚度。 由于AlYGa1-YAs晶体层的表面已经被剥离,所形成的AlXGa1-XAs晶体层具有高结晶度,从而能够以高效率制造发光二极管,半导体激光器件等。
摘要:
A semiconductor device comprising a (111)B single-crystalline semiconductor substrate which is misoriented toward (110), and epitaxial layers grown on the substrate by molecular beam epitaxy, whereby the crystallinity and luminescence efficiency of epitaxial layers are significantly improved.
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:
By using a single semiconductor laser device, laser beams in infrared and red regions are generated at a distance between close light emitting spots. A semiconductor laser resonator having an oscillation wavelength in an infrared region and a semiconductor laser resonator having an oscillation wavelength in a red region are formed in parallel on the same semiconductor substrate.
摘要:
A projecting device is disclosed which has plural element lens systems arranged in at least two rows in a staggered fashion in two grooved blocks, with one row displaced relative to the adjacent row by a distance equal to half the pitch of the adjacent row. Each lens system is composed of at least one bar lens for imaging a part of the object as a part of the corresponding image. An opaque elastomer material fills the space between the rows for preventing light from entering into the space while allowing the positional relation between the rows to be fine-adjusted.
摘要:
This specification discloses a projection device in which a plurality of element lens systems for projecting a part area of an object onto a predetermined part area on the image plane at erect one-to-one magnification are arranged parallel to one another in a plane perpendicular to the optical axis. Each element lens system is a telecentric system comprising three thin lenses of the same shape arranged in the direction of the optical axis, and an intermediate lens is provided at a position deviated from the intermediate point between the object side lens and the image plane side lens. A light absorbing member for extinguishing any light rays exceeding the effective lens diameter is provided between the lenses, and the light intensity distribution on the image plane of each element lens system is controlled substantially to Gauss distribution form by aperture eclipse and, even if there is any error in the arrangement interval, the exposure amount distribution in the arrangement direction superposed on the image plane is uniform.
摘要:
A method for manufacturing a semiconductor laser device is provided in which deformation of a cap layer and a third cladding layer is inhibited and a protruding portion of an intermediate layer is removed. By coating outer peripheral portions facing an intermediate layer of a third cladding layer and an etching stop layer with a resist, inevitably removing at least the third cladding layer, and etching the intermediate layer and a cap layer in a second etching step, a protruding portion of the intermediate layer is removed, and the cap layer is prevented from being etched undesirably, whereby a ridge portion without irregularities with respect to a direction substantially perpendicular to a lamination direction is produced, and increase of an operation voltage and decrease of external differential quantum efficiency are prevented.
摘要:
A ridge section constructed of a p-type second AlGaInP clad layer 8, a p-type GaInP interlayer 9 and a p-type GaAs cap layer 10 is formed on an etching stop layer 7. A step of not smaller than 0.13 μm is formed between the p-type interlayer 9 and the p-type second clad layer 8 by making the p-type interlayer 9 protrude in both widthwise directions beyond the p-type second clad layer 8. With this step, AlInP layers can be formed separately from each other on both sides of the ridge section and on the ridge section. Therefore, when the AlInP layer on the ridge section is removed by etching, an AlInP current constriction layer 13 located on both sides of the ridge section is reliably protected by a resist film and not over-etched. The AlInP current constriction layer 13 effectively puts a current constriction function into effect, so that a semiconductor laser device of low-threshold current and low-power consumption is obtained.