摘要:
The invention relates to a heterostructure semiconductor laser diode with a layer sequence formed on a substrate, wherein a laser-active zone is arranged between layers of respectively opposite conductivity types, wherein an additional layer having a cover layer disposed thereon, and both of the same conductivity type as the substrate, are formed on the side of the layer sequence facing away from the substrate, and wherein a semiconductor area doped oppositely to the cover layer is produced by diffusion in the cover layer and penetrates, in a strip-shaped zone extending perpendicularly to the exit surface of the laser radiation in the area of the plane of symmetry below a v-groove-shaped recess, the boundary plane between the cover layer and the adjacent additional layer and extends into but not through the layer arranged thereunder, whereby the current flowing in the forward direction of the semiconductor laser diode is confined to a narrow strip-shaped area of the laser-active layer. The amplifying area of the laser-active is made significantly shorter in its length-wise dimensions than the resonator length of the semiconductor laser diode by the laser-active layer extending in a small area of the resonator length immediately in front of the two mirrors of the semiconductor laser diode at an incline to the main plane of the laser-active layer and by the v-groove-shaped recess being symmetrically shortened by the amount of this small area in relation to the resonator length.
摘要:
A semiconductor laser device comprises a semiconductor laser portion (17) including a double hetero structure and a vertical MIS-FET portion (18) form on, and in series with, the semiconductor laser portion (17). The vertical MIS-FET portion (18) includes an n-type GaAs layer (6), a p-type GaAs layer (7), an n-type GaAs layer (8), and a striped groove (31) having V-shaped cross-section formed from the top surface of the n-type GaAs layer (8) to the n-type GaAs layer (6). A metal gate electrode (11) is further provided on the top surface of the striped groove (31), on an insulating film (10). A current (41)flowing through the vertical MIS-FET portion (18) is changed according to a photo modulating signal applied to the metal gate electrode (11) and, a current (40) is also changed according to the current (41). Accordingly, a laser oscillation output of the semiconductor laser portion (17) is also changed to accomplish the optical output modulation of the semiconductor laser.
摘要:
A semiconductor laser having mirror faces serving as resonators, in which the active laser region includes end zones adjoining the mirror faces which have implanted ions, preferably protons, with associated crystal damage. The end zones have a length which is at least equal to the diffusion length of the recombining charge carriers in the end zones. As a result of the high recombination rate in the end zones substantially no non-radiating recombination occurs at the mirror faces, so that mirror erosion is avoided.
摘要:
Semiconductor light emitting devices, lasers and LEDs, are described in which the current flow channel is narrower near the top surface of the device and wider at its bottom near the active region. Also, described are several attenuation masks for fabricating the channels of these devices by particle bombardment.
摘要:
Semiconductor lasers and LEDs are described in which the pumping current is constrained to flow from a relatively narrow upper channel formed by a V-groove, which extends to a depth short of the active region, through a relatively wider lower channel bounded by high resistivity regions, which extend from at least that depth into or through the active region. Also described are devices in which the V-groove is refilled with semiconductor material.
摘要:
A monolithic laser optical cavity structure and method of forming by use of planar photolithographic and crystal regrowth techniques. An original growth multilayer double heterostructure laser structure is grown by LPE on a N+-GaAs substrate. V-grooves are then etched in the epitaxial layers down through the optical cavity by photolithographic techniques. GaAlAs is grown in the V-grooves by crystal regrowth techniques up to the original surface of the laser wafer thus isolating the lasers from each other. The lasers are then separated to form laser arrays.