摘要:
An optical semiconductor device operable in a 0.6 μm band includes an active layer of GaInNP sandwiched by a pair of GaInP layer with a thickness of about 2 molecular layers or less.
摘要:
An optical semiconductor device operable in a 0.6 μm band includes an active layer of GaInNP sandwiched by a pair of GaInP layers each having a thickness of about 2 molecular layers or less.
摘要:
A light emitting semiconductor device, which includes a Ga0.9In0.1As0.97 active layer disposed between lower n-Ga0.5In0.5P and upper p-Ga0.5In0.5P cladding layers, being provided with lower and upper GaAs spacing layers each intermediate the active layer and the cladding layer. The active layer is approximately lattice-matched to a GaAs substrate and has a thickness of about 0.1 &mgr;m with a photoluminescence peak wavelength of approximately 1.3 &mgr;m, and the GaAs spacing layers each have a thickness of about 2 nm.
摘要:
Disclosed herein is a laser diode module having a thermoelectric cooling element, a laser diode, and a thermistor in a housing. The thermoelectric cooling element has a first surface and a second surface between which heat exchange is performed. The first surface is in close contact with an inner surface of the housing. A base is provided on the second surface in close contact therewith. A laser carrier and a thermistor carrier are provided on the base in close contact therewith. The laser diode and the thermistor are provided on the laser carrier and the thermistor carrier in close contact therewith, respectively. A portion of the base in the vicinity of the laser carrier is thermally connected to the housing by a metal plate, for example, thereby allowing high-precision temperature control of the laser diode.
摘要:
Nitrogen-containing III-V alloy semiconductor materials have both a conduction band offset &Dgr;Ec and a valence band offset &Dgr;Ev large enough for the practical applications to light emitting devices. The semiconductor materials are capable of providing laser diodes, having excellent temperature characteristics with emission wavelengths in the red spectral region and of 600 nm or smaller, and high brightness light emitting diodes with emission wavelengths in the visible spectral region. The light emitting device is fabricated on an n-GaAs substrate, which has the direction normal to the substrate surface is misoriented by 15° from the direction normal to the (100) plane toward the [011] direction. On the substrate, there disposed by MOCVD, for example, are an n-GaAs buffer layer, an n-(Al0.7Ga0.3)0.51In0.49P cladding layer, an (Al0.2Ga0.8)0.49In0.51N0.01P0.99 active layer, a p-(Al0.7Ga0.3)0.51In0.49P cladding layer, and a p-GaAs contact layer.
摘要:
A light emitting device is provided, which comprises a III-V semiconductor alloy layered structure as an active layer thereof, including N and at least one other group-V element, and at least one group-III element. The light emitting device is in use for red wavelength laser diodes having excellent temperature characteristics, visible wavelength laser diodes which may achieve emissions shorter wavelengths than 600 nm, visible region light emitting diodes having a high intensity, laser diodes for optical communication having excellent temperature characteristics, and similar light emitting devices. The III-V semiconductor alloy layered structure is provided to be used as an active layer for forming the light emitting device, which comprises first and second monatomic layers. The first monatomic layer includes a III-V semiconductor alloy containing N, at least one other group-V element, and at least one group-III element; and the second monatomic layer includes a III-V semiconductor alloy containing no N and at least one group-V element excepting N, and at least one group-III element. Through the deposition of the first and second monatomic layers in a predetermined order, the III-V semiconductor alloy structure is formed as a superlattice structure having a deduced average composition.
摘要:
A multilayer mirror includes a multilayer reflection structure formed of an alternate repetition of a first epitaxial layer of a first refractive index and a second epitaxial layer of a second refractive index larger than the first refractive index, wherein the second epitaxial layer includes a group III-V mixed crystal containing N as a group V element.
摘要:
A laser diode includes a substrate, a lower cladding layer or a lower optical waveguide layer substantially free from Al and provided on the substrate, an active layer of a mixed crystal containing Ga and In as a group III element and N, As and/or P as a group V element, provided on the lower cladding layer; and an upper cladding layer or an upper optical waveguide layer substantially free from Al and provided on the active layer.
摘要:
The invention is intended to provide a three-dimensional image projecting device which is capable of presenting a three-dimensional image observable in a wide visual field without tiring eyes of an observer. A three-dimensional image displayed by three-dimensional image displaying means is projected by a reflection type projecting hologram lens and reflection type hologram acting as optical transferring means and a reflection type hologram lens to produce respective three-dimensional images. These three-dimensional images are formed at the same magnification in the same space to form a continuous image area. For this purpose, reflection type hologram lenses are disposed on the periphery of a circle. Respective three-dimensional images is reflected by the reflection type hologram acting as the optical transferring means, thus an enlarged three-dimensional image can be seen over the respective visual fields.