摘要:
A semiconductor laser element which can provide a good FFP free from ripple and close to a Gaussian distribution, and which is provided with a laminate structure that is formed by sequentially laminating a first conductive type semiconductor layer, an active layer, and a second conductive type (different from the first conductive type) semiconductor layer and that has a waveguide area for guiding light in one direction and a laser-resonating resonator surfaces at the opposite ends thereof, wherein the laminate structure has at one end thereof a non-resonator surface separate from the resonator surfaces and formed so as to include an active layer sectional surface, and the active layer sectional surface of the non-resonator surface is covered with a light shielding layer.
摘要:
An etched-facet single lateral mode semiconductor photonic device is fabricated by depositing an anti reflective coating on the etched facet, and depositing a reflectivity modifying coating in a spatially controlled manner to modify the spatial performance of the emitted beam.
摘要:
A device and a process for integrating light energy transmit and/or receive functions with active devices such as GaAs or InP devices or light emitting devices, such as lasers. The device and process includes forming a passivation layer on top of the active device and forming a silicon photodetector on top of the passivation layer. The photodetector may be formed utilizing a standard solar cell growth process and may be formed as a mesa on top of the active or light-emitting device, thus forming a relatively less complicated semiconductor with an integrated monitoring device.
摘要:
To provide a semiconductor laser device which has no ripple and can afford better FFP having a pattern near a Gaussian distribution upon operation at the high output, the semiconductor laser comprising a laminate structure in which a first conductive type semiconductor layer, an active layer and a second conductive type semiconductor layer different from the first conductive type are laminated in this order, the laminate structure having a waveguide region to guide a light and resonator planes for laser oscillation on both ends, characterized in that the laminate structure has a non-resonator plane on one end side and the non-resonator plane is covered with a shading layer.
摘要:
A semiconductor light emitting device easily controlled in reflectance of its cavity edges has formed on the cavity edges of its laser cavity rugged structures including elongated concave portions extending substantially in parallel with bonded surfaces of semiconductor layers forming the laser cavity. The laser cavity is made by sequentially stacking on a substrate an n-type AlGaN cladding layer, n-type GaN optical guide layer, InGaN active layer, p-type GaN optical guide layer and p-type AlGaN cladding layer. The rugged structure is made by first making the cavity edges by etching and then processing the cavity edges by wet etching so that the cavity edges are selectively excavated due to differences in chemical property among semiconductor layers forming the laser cavity caused by differences in composition among them.
摘要:
A semiconductor laser device provided with a broad light waveguide path (1) through which a higher order transverse mode can be propagated, includes at least one of laser facets of the light waveguide path (1) comprising a high reflectance region (4) having a width of about 1/5 to 1/2 of the width of the light waveguide path (1) located at a central portion thereof and a low reflectance region having a lower reflectance than the high reflectance region (4) located at both sides of the high reflectance region (4).
摘要:
A semiconductor laser device provided with a broad light waveguide path (1) through which a higher order transverse mode can be propagated, includes at least one of laser facets of the light waveguide path (1) comprising a high reflectance region (4) having a width of about 1/5 to 1/2 of the width of the light waveguide path (1) located at a central portion thereof and a low reflectance region having a lower reflectance than the high reflectance region (4) located at both sides of the high reflectance region (4).
摘要:
A surface emitting laser (100) includes a lower multilayer mirror (120), an active layer (140), and an upper multilayer mirror (160) stacked onto a substrate (110). A first current confinement layer (210) having a first electrically conductive region (212) and a first insulating region (214) formed above or below the active layer using a first trench structure (230). A second current confinement layer (220) having a second electrically conductive region (222) and a second insulating region (224) is formed above or below the first current confinement layer using a second trench structure (240). The two trench structures extend from a top surface of the upper multilayer mirror such that the second trench structure surrounds the first trench structure. When viewed in an in-plane direction of the substrate, a boundary between the first electrically conductive region and the first insulating region is disposed inside the second electrically conductive region.
摘要:
A surface emitting laser (100) includes a lower multilayer mirror (120), an active layer (140), and an upper multilayer mirror (160) stacked onto a substrate (110). A first current confinement layer (210) having a first electrically conductive region (212) and a first insulating region (214) formed above or below the active layer using a first trench structure (230). A second current confinement layer (220) having a second electrically conductive region (222) and a second insulating region (224) is formed above or below the first current confinement layer using a second trench structure (240). The two trench structures extend from a top surface of the upper multilayer mirror such that the second trench structure surrounds the first trench structure. When viewed in an in-plane direction of the substrate, a boundary between the first electrically conductive region and the first insulating region is disposed inside the second electrically conductive region.
摘要:
A laser light source especially comprises a semiconductor layer sequence (10) having an active zone (45) and a radiation output surface (12) with a first section (121) and a second section (122), which is different therefrom, and a filter structure (5). When operating, the active zone (45) produces coherent first electromagnetic radiation (51) of a first wavelength range and incoherent second electromagnetic radiation (52) of a second wavelength range. The coherent first electromagnetic radiation (51) is emitted in a direction of emission (90) by the first section (121). The incoherent second electromagnetic radiation (51) is emitted by the first section (121) and the second section (122). The second wavelength range comprises the first wavelength range. The filter structure (5) at least partially attenuates the incoherent second electromagnetic radiation (52) emitted by the active zone along the direction of emission.