Abstract:
A semiconductor laser capable of emitting blue or green light is disclosed. The semiconductor laser comprises an n-type ZnMgSSe cladding layer (2), an active layer (3), a p-type ZnMgSSe cladding layer (4), a p-type ZnSe contact layer (5) and a p-type ZnTe contact layer (6) which are stacked in this sequence on an n-type GaAs substrate (1). A p-side electrode (7) is provided on the p-type ZnTe contact layer (6). An n-side electrode (8) is provided on the back surface of the n-type GaAs substrate (1). A maltiquantum well layer (9) comprising quantum wells made of p-type ZnTe and barriers made of p-type ZnSe is provided in the depletion layer produced in the p-type ZnSe contact layer (5) along the junction interface between the p-type ZnSe contact layer (5) and the p-type ZnTe contact layer (6). Holes injected from the p-side electrode (7) pass through the junction by the resonant tunneling effect through quantum levels formed in the quantum wells of the multiquantum well layer (9).
Abstract:
Una película de un semiconductor compuesto del grupo II - VI de por lo menos uno de los elementos que pertenecen al grupo II de la tabla periodica, y por lo menos uno de los elementos que pertenecen al grupo VI de la tabla periodica se deposita sobre un substrato. Cuando la película se deposita sobre el substrato, se aplica un plasma de nitrogeno en estado excitado al substrato mientras que se remueven las partículas cargadas del plasma mediante un medio de remocion de partícula cargada. La película depositada del semiconductor compuesto del grupo II - VI adulterado con nitrogeno tiene un porcentaje aumentado de átomos de nitrogeno activados y cristalinidad mejorada.
Abstract:
A semiconductor laser is formed into a double hereto junction structure comprising an n-type cladding layer (3) and a p-type cladding layer (5) with an active layer (4) interposed therebetween. The p-type cladding layer (5) has a laminated structure consisting of a first cladding layer (51) of (AlxGa1-x)InP disposed on one side adjacent to the active layer (4) and a second cladding layer (52) of AlyGa1-yAs disposed on the reverse side. A deterioration preventive layer (11) of AlzGa1-yAs is included in the first cladding layer (51) at a position spaced apart from the second cladding layer (52) by a predetermined distance. In addition, the second cladding layer (52) is partially removed, and a current stricture layer (10) is formed in such removed portion.
Abstract:
A semiconductor laser device arranged so that at least one of cladding layers is formed of a thin AlGaInP layer having a larger energy band gap as compared with an active layer adjacent to the active layer and an AlGaAs layer having a high thermal conductivity as compared with that of the AlGaInP layer and the larger energy band gap as compared with the active layer, which is located between the AlGaInP layer and a heat sink, whereby a heat generated in the active layer is effectively radiated to the heat sink, thus the semiconductor laser being made capable of continuously emitting a laser light of a short wavelength at a room temperature.
Abstract:
A semiconductor laser device arranged so that at least one of cladding layers is formed of a thin AlGaInP layer having a larger energy band gap as compared with an active layer adjacent to the active layer and an AlGaAs layer having a high thermal conductivity as compared with that of the AlGaInP layer and the larger energy band gap as compared with the active layer, which is located between the AlGaInP layer and a heat sink, whereby a heat generated in the active layer is effectively radiated to the heat sink, thus the semiconductor laser being made capable of continuously emitting a laser light of a short wavelength at a room temperature.
Abstract:
A semiconductor laser device arranged so that at least one of cladding layers is formed of a thin AlGaInP layer having a larger energy band gap as compared with an active layer adjacent to the active layer and an AlGaAs layer having a high thermal conductivity as compared with that of the AlGaInP layer and the larger energy band gap as compared with the active layer, which is located between the AlGaInP layer and a heat sink, whereby a heat generated in the active layer is effectively radiated to the heat sink, thus the semiconductor laser being made capable of continuously emitting a laser light of a short wavelength at a room temperature.
Abstract:
PROBLEM TO BE SOLVED: To provide a drive method of a mode-lock semiconductor laser element having a configuration capable of reducing influences of piezo polarization and spontaneous polarization.SOLUTION: The mode-lock semiconductor laser element has a laminate structure which includes: a first compound semiconductor layer 30 of a GaN compound semiconductor; a third compound semiconductor layer 40 having a light emitting region 41 and a saturable absorption region 42; and a second compound semiconductor layer 50 which are laminated in order; and a second electrode 62 and a first electrode 61. The second electrode 62 is separated into a first portion 62A and a second portion 62B by a separation groove 62C. When a current flows from a first portion of the second electrode to a first electrode via the light emitting region, the second electrode 62 gets into a forward bias state; and when a voltage is applied across the first electrode and the second portion of the second electrode, an electric field is applied to a saturable absorption region. Thus, the semiconductor laser element performs a single mode self-pulsation operation in the light emitting region.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of driving an ultrashort pulse/ultrahigh power semiconductor laser element having a simple composition and structure. SOLUTION: In the method of driving the semiconductor laser element, light is injected from a light injection means 10 into the semiconductor laser element 20 driven by a pulse current having a value 10 or more times as large as a value of a threshold current, or the light is injected from the light injection means 10 into the semiconductor laser element 20 driven by a pulse voltage having a value twice or more as large as a value of a threshold voltage. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor laser that can perform a self-pulsation operation, sufficiently decrease coherence of laser light, and stably obtain low-noise laser light. SOLUTION: The semiconductor laser has a laser chip 10 having at least one laser stripe 11, extending in a resonator length direction, between end surfaces 10a and 10b facing each other. The laser stripe 11 has a gain region 14 and a saturable absorption region 15 in the resonator length direction. The width of the laser stripe 11 in the saturable absorption region 15 is made larger than the width of the laser stripe 11 in the gain region 14. Electrodes 16 and 17 are provided separately from each other on the gain region 14 and saturable absorption region 15 respectively. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method for easily manufacturing a semiconductor LED using nitride-based group III-V compound semiconductor with a long lifetime due to a low initial impairment rate, while its aged deterioration and luminescence nonuniformity are very low. SOLUTION: When a semiconductor LED, with a structure in which an InGaN active layer 7, undoped InGaN deterioration preventing layer 8, undoped GaN optical waveguide layer 17, p-type AlGaN cap layer 9 and p-type AlGaN/GaN superlattice clad layer 18 are laminated, in this order, the active layer 7, undoped InGaN deterioration preventing layer 8, undoped GaN optical waveguide layer 17, and p-type AlGaN cap layer 9 must be grown at a growth temperature lower than that of the p-type AlGaN/GaN superlattice clad layer 18. COPYRIGHT: (C)2006,JPO&NCIPI