摘要:
A semiconductor laser has an active region which includes at least a quantum well layer and upper and lower optical waveguide layers and is of In x Ga 1-x As y P 1-y (0≦x≦1, 0≦y≦1). Upper and lower AlGaAs cladding layers are formed on opposite sides of the active region. At least one of the optical waveguide layers is not smaller than 0.25µm in thickness, and a part of the upper cladding layer on the upper optical waveguide layer is selectively removed up to the interface of the upper cladding layer and the upper optical waveguide layer.
摘要:
In a II-VI group semiconductor laser, on an n type GaAs substrate, n type ZnSe layer, a multiquantum well layer of a ZnCdSe well layer and a ZnSe barrier layer, and a p type ZnSe layer are deposited in this order. A polycrystalline ZnO layer is provided on both sides of the p type ZnSe layer for constricting current. Multifilm reflecting mirrors, respectively constituted with a polycrystalline SiO 2 layer and a polycrystalline TiO 2 layer, for obtaining laser oscillation are provided on, the p type ZnSe layer as well as on a surface of the n type ZnSe layer exposed by etching the GaAs substrate. Furthermore, a p type AuPd electrode and an n type AuGeNi electrode are respectively provided. Alternatively, on an n type GaAs substrate, an n type ZnSe epitaxial layer, an n type ZnMgSSe cladding layer, an n type ZnSSe optical waveguide layer, a ZnCdSe active layer, a p type ZnSSe optical waveguide layer, a p type ZnMgSSe cladding layer, a p type ZnTe contact layer and a polycrystalline ZnO burying layer are respectively formed. Furthermore, a p type AuPd electrode and an n type In electrode are respectively provided.
摘要:
A compound semiconductor laser of a III group nitride semiconductor of the present invention includes a first cladding layer 104 of a first conduction type formed on a substrate 101 , an active layer 106 formed on the first cladding layer, a second cladding layer 108 of a second conduction type formed on the active layer 106 , and a buried layer 110 formed on the second cladding layer 108 , the buried layer having an opening portion for constricting a current in a selected region of the active layer, wherein an upper portion of the second cladding layer 108 has a ridge portion, the ridge portion residing in the opening portion of the buried layer 110 , and the buried layer 110 does not substantially absorb light output from the active layer 106 , and the buried layer has a refractive index which is approximately identical with that of the second cladding layer 108 .
摘要:
The present invention provides a surface-emitting laser wherein the transverse modes are controlled and phase-synchronized laser beams are emitted from a plurality of light-emitting portions to produce what appears to be a single laser beam, and a method of fabrication thereof. This laser comprises a columnar portion (20) forming part of a reflective mirror on a light-emitting side, an embedding layer (22) surrounding the periphery of the columnar portion (20), an upper electrode (23) formed on the columnar portion (20) and the embedding layer (22), and an insulating layer (18) formed below the columnar portion (20) and the embedding layer (22). A plurality of aperture portions (23a) are formed in the upper electrode (23) above the columnar portion (20), and aperture portions (18a) are formed in the insulation layer (18) at positions corresponding to the aperture portions (23a). The absolute refractive index of the embedding layer (22) is slightly smaller than that of the columnar portion (20), so that the transverse modes are controlled thereby.
摘要:
In a II-VI group semiconductor laser, on an n type GaAs substrate, n type ZnSe layer, a multiquantum well layer of a ZnCdSe well layer and a ZnSe barrier layer, and a p type ZnSe layer are deposited in this order. A polycrystalline ZnO layer is provided on both sides of the p type ZnSe layer for constricting current. Multifilm reflecting mirrors, respectively constituted with a polycrystalline SiO 2 layer and a polycrystalline TiO 2 layer, for obtaining laser oscillation are provided on the p type ZnSe layer as well as on a surface of the n type ZnSe layer exposed by etching the GaAs substrate. Furthermore, a p type AuPd electrode and an n type AuGeNi electrode are respectively provided. Alternatively, on an n type GaAs substrate, an n type ZnSe epitaxial layer, an n type ZnMgSSe cladding layer, an n type ZnSSe optical waveguide layer, a ZnCdSe active layer, a p type ZnSSe optical waveguide layer, a p type ZnMgSSe cladding layer, a p type ZnTe contact layer and a polycrystalline ZnO burying layer are respectively formed. Furthermore, a p type AuPd electrode and an n type In electrode are respectively provided. One embodiment comprises a vertical cavity semiconductor laser.
摘要:
A semiconductor device includes a substrate, a plurality of semiconductor layers stacked on the substrate and including an active layer having two opposite end faces, a first thin film coated on at least one of the end faces and consisting of a material having a stable composition and a high passivation function, a second thin film coated on the first thin film and having a predetermined refractive index, and electrodes for supplying a current to the active layer. A method of manufacturing the semiconductor device is also disclosed.
摘要:
A semiconductor laser element includes a stacked structure body, a second electrode 62, and a first electrode 61; a ridge stripe structure 71 formed of at least part of the stacked structure body is formed; a side structure body 72 formed of the stacked structure body is formed on both sides of the ridge stripe structure 71; the second electrode 62 is separated into a first portion for sending a direct current to the first electrode via a light emitting region and a second portion 62B for applying an electric field to a saturable absorption region; a protection electrode 81 is formed on a portion adjacent to the second portion 62B of the second electrode of at least one side structure body 72; and an insulating layer 56 made of an oxide insulating material is formed to extend from on a portion of the ridge stripe structure 71 to on a portion of the side structure body 72, on which portions neither the second electrode nor the protection electrode 81 is formed.
摘要:
An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. A wavelength selective combiner is formed on the PIC chip having a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. The signal outputs of the modulated sources optically coupled to inputs of the wavelength selective combiner to produce a combined signal output from the combiner. A first wavelength tuning element coupled to each of the modulated sources and a second wavelength tuning element coupled to the wavelength selective combiner. A wavelength monitoring unit is coupled to the wavelength selective combiner to sample the combined signal output. A wavelength control system coupled to the first and second wavelength tuning elements and to said wavelength monitoring unit to receive the sampled combined signal output. The wavelength control system adjusts the respective wavelengths of operation of the modulated sources to approximate or to be chirped to the standardized wavelength grid and for adjusting the optical combiner wavelength grid passband response to approximate the standardized wavelength grid.
摘要:
The present invention relates to a method for integrating a sub-micron III-V waveguide laser on a semiconductor photonics platform as well as to a corresponding device/system. The method comprises providing on a semiconductor substrate (1) an electrically insulating layer (2), etching a trench (10) having a width in the range between 50 nm and 800 nm through the electrically insulating layer (2), thereby locally exposing the silicon substrate (1), providing a III-V layer stack in the trench (10) by local epitaxial growth to form a channel waveguide; and providing a light confinement element for confining radiation in the local-epitaxial-grown channel waveguide.