Abstract:
The present invention provides a laser structure (100) that operates at a wavelength of 1.3µm and at elevated temperatures and a method of making same. The laser structure (100) includes a quantum well layer (32) of InAsP. The quantum well layer (32) is sandwiched between a first barrier layer (33) and a second barrier layer (34). Each barrier layer (33) (34) exhibits a higher bandgap energy than the quantum well layer (32). Also, each barrier layer (33) (34) comprises Ga x (AlIn) 1-x P in which x ≥ 0. This material has a higher bandgap energy than conventional barrier layer materials, such as InGaP. The resulting larger conduction band discontinuity leads to improved high temperature performance without increasing the threshold current of the laser structure (100).
Abstract:
In an S 3 -type semiconductor laser, in the perpendicular plane to the traveling direction of light, when an angle of a first growth profile line to the second principal planes, the first growth profile line connecting respective lower side lines of an upper inclined plane (10a) and a lower inclined plane (8a), both inclined planes (9a, 10a) formed along the second inclined plane (8a), of the first layer (9, 10) of the second conduction type cladding layer is θ 11 , and an angle of a second growth profile line to the second principal planes, the second growth profile line connecting respective lower side lines of an upper inclined plane (11a) and a lower inclined plane (10a), both inclined planes (11a, 10a) formed along the second inclined plane (8a), of the second layer (11) of the second conduction type cladding layer is θ 12 , θ 11 >θ 12 is satisfied.
Abstract:
In an S 3 -type semiconductor laser, when an angle of a first growth profile line to the first principal plane (1a, 1b), the first growth profile line connecting respective. lower. side lines of an upper inclined plane (4a) and a lower inclined plane (3a) of the first layer (4) of the first conduction type cladding layer is θ 1 , an angle of a second growth profile line to the first principal plane (1a, 1b), the second growth profile line connecting respective lower side lines of an upper inclined plane (5a) and a lower inclined plane (4a) of the second layer (5) of the first conduction type cladding layer is θ 2 , an angle of a third growth profile line to the first principal plane (1a, 1b), the third growth profile line connecting respective lower side lines of an upper inclined plane (6a) and a lower inclined plane (5a) of the third layer (6) of the first conduction type cladding layer is θ 3 , and an angle of a fourth growth profile line to the first principal plane (1a, 1b), the fourth growth profile line connecting respective lower side lines of an upper inclined plane (7a) and a lower inclined plane (6a) of the fourth layer of the first conduction type cladding layer is θ 4 , relationships θ 1 2 , θ 2 >θ 3 , θ 3 4 can be satisfied.
Abstract:
An S 3 -type laser diode includes a p-type cladding layer (36) formed on an active layer (35) such that an inclined surface region thereof has a carrier concentration level of 1 x 10 18 cm -3 or more, wherein the p-type cladding layer (36) has a thickness of 0.35µm or more.
Abstract:
A novel method of easily forming a quaternary group III-V crystal on the group III-V crystal maintaining the lattice superposition relative to the group III-V crystal. It is easy to form a superlattice that consists of a first binary group III-V (written as III 1 -V 1 ) crystal layer and a ternary group III-V (III 1 -III 2 -V 2 ) crystal layer on a substrate of group III-V crystal both maintaining lattice superposition with the substrate. A stabler superlattice layer is obtained if the ratio of film thickness of the III 1 -V 1 crystal to that of the III 1 -III 2 -V 2 crystal is so selected that the compositions thereof maintain the lattice superposition with the original crystal when the superlattice forms a mixed crystal spontaneously or being doped with impurities.