Abstract: A device including a semiconductor laser device having a semiconductor laser chip, and a molded resin having a light diffusion capability. The semiconductor laser chip is covered with the molded resin.

Abstract: This light emitting device has a light emitting part for emitting light into a range including an optical axis, and a radiation lens for refracting the light emitted from the light emitting part and radiating the light into outer space, the radiation lens provided around the optical axis so as to cover the light emitting part. In a coordinate system having an origin that is a center of the light emitting part, a y-axis that is the optical axis, and an x-axis orthogonal to the y-axis, an interface between the radiation lens and the outer space is expressed by a function y=g(x) in a domain of x?0. Increase in |x| changes a sign of a second derivative d2g(x)/dx2 of the function g(x) from negative to positive at an inflexion point x0, and there is a recess on the interface of the lens.

Abstract: A light source device for radiating a stimulated emission from a semiconductor laser to outside via a multiple scattering optical system, which system has a first region located adjacent to the semiconductor laser and a second region that abuts on the first region and reaches the outside. The first region contains scatterers at a higher density than the second region does. The light source device has an amount of near-field pattern speckles ?PAR of 3×10?3 or more. The second region may have a lens portion as a magnifier for at least a principle part of a secondary planar light source formed at an interface between the first and second regions.

Abstract: A highly sensitive and inexpensive spatial optical transmission system using an LD (Laser Diode) as a light source and making use of the characteristics of a light receiving element is provided. The system includes a laser chip oscillating a laser beam, and a light receiving element receiving and converting to an electric signal the laser beam emitted from the laser chip and propagated through a space. The laser chip oscillates a laser beam having a wavelength of which absorption coefficient at the light receiving element is in a range of 0.001 to 0.3 ?m?1.

Abstract: A highly sensitive and inexpensive spatial optical transmission system using an LD (Laser Diode) as a light source and making use of the characteristics of a light receiving element is provided. The system includes a laser chip oscillating a laser beam, and a light receiving element receiving and converting to an electric signal the laser beam emitted from the laser chip and propagated through a space. The laser chip oscillates a laser beam having a wavelength of which absorption coefficient at the light receiving element is in a range of 0.001 to 0.3 ?m?1.

Abstract: A light source device for radiating a stimulated emission from a semiconductor laser to outside via a multiple scattering optical system, which system has a first region located adjacent to the semiconductor laser and a second region that abuts on the first region and reaches the outside. The first region contains scatterers at a higher density than the second region does. The light source device has an amount of near-field pattern speckles ?PAR of 3×10?3 or more. The second region may have a lens portion as a magnifier for at least a principle part of a secondary planar light source formed at an interface between the first and second regions.

Abstract: A device including a semiconductor laser device having a semiconductor laser chip, and a molded resin having a light diffusion capability. The semiconductor laser chip is covered with the molded resin.

Abstract: A light source apparatus is provided with a light scattering region 5 containing light scattering particles 6 disposed in a part of a region extending from a semiconductor light-emitting laser chip 1 to an external space. An asymmetry factor g of the light scattering particles 6 and a transport optical depth <n> of the light scattering region 5 are set so that their product g.<n> satisfies a following condition: 2?g·<n>?40 The light source apparatus is of small-size and low-cost and can ensure safety of human eyes as well as obtain a high optical output.

Abstract: A semiconductor laser device includes a semiconductor laser chip, and a molded resin having a light diffusion capability. The semiconductor laser chip is covered with the molded resin.

Abstract: A semiconductor laser device with a spot-size converter includes at least a semiconductor laser region emitting light from an end facet thereof and a light waveguide region. The semiconductor laser region and the light waveguide region are integrated on a semiconductor substrate in a horizontal direction. A semiconductor layer is buried in a junction region between the semiconductor laser region and the light waveguide region.

Abstract: A semiconductor laser element includes: a semiconductor laser region in which at least one laser emission portion including an active layer for emitting light is provided; a multimode interference region including a first wave-guiding layer, one end of the first wave-guiding layer being optically coupled to the active layer of the at least one laser emission portion; and an output waveguide region including a second wave-guiding layer, the second wave-guiding layer being optically coupled to another end of the first wave-guiding layer, wherein the active layer of the at least one laser emission portion, the first wave-guiding layer, and the second wave-guiding layer are integrally formed.

Abstract: A surface of a molded resin 4 is entirely or partially roughened, and the light is diffused by the roughened portion. Alternatively, a cap and a glass cap having a light-diffusive function are integrated together with a resin. Alternatively still, a resin section formed of a resin material in which another resin material having a different refractive index from that of the first resin material is mixed, or a resin formed of a birefringent resin material, is provided so as not to contact a laser chip, and the light is diffused by the resin section. Alternatively still, an area formed of a resin material in which another resin material having a different refractive index from that of the first resin material is mixed, or an area formed of a birefringent resin material, is provided so as not to contact the laser chip, and the light is diffused by the area.

Abstract: An integrated optical circuit device includes: a first optical element section including first and second element regions deposited along a thickness direction; a second optical element section formed away from the first optical element section; and a multimode interference region provided between the first and second optical element sections, the multimode interference region including a buried portion formed along a light propagation direction. The first and second optical element sections are optically coupled to each other via the multimode interference region.

Abstract: An integrated optical circuit device includes: a first optical element section including first and second element regions deposited along a thickness direction; a second optical element section formed away from the first optical element section, and a multimode interference region provided between the first and second optical element sections, the multimode interference region including a buried portion formed along a light propagation direction. The first and second optical element sections are optically coupled to each other via the multimode interference region.

Abstract: An integrated optical circuit device includes: a first optical element section including first and second element regions deposited along a thickness direction; a second optical element section formed away from the first optical element section; and a multimode interference region provided between the first and second optical element sections, the multimode interference region including a buried portion formed along a light propagation direction. The first and second optical element sections are optically coupled to each other via the multimode interference region.

Abstract: A highly sensitive and inexpensive spatial optical transmission system using an LD (Laser Diode) as a light source and making use of the characteristics of a light receiving element is provided. The system includes a laser chip oscillating a laser beam, and a light receiving element receiving and converting to an electric signal the laser beam emitted from the laser chip and propagated through a space. The laser chip oscillates a laser beam having a wavelength of which absorption coefficient at the light receiving element is in a range of 0.001 to 0.3 &mgr;m−1.

Abstract: The waveguide type optical integrated circuit element of this invention includes: a semiconductor laser of an end face output type; and an optical waveguide for propagating output light from the semiconductor laser, the optical waveguide including a plurality of semiconductor layers, the semiconductor laser and the optical waveguide being integrally formed side by side on a semiconductor substrate, wherein a single semiconductor layer is buried in an interface area between the semiconductor laser and the optical waveguide.

Abstract: The waveguide type optical integrated circuit element of this invention includes: a semiconductor laser of an end face output type; and an optical waveguide for propagating output light from the semiconductor laser, the optical waveguide including a plurality of semiconductor layers, the semiconductor laser and the optical waveguide being integrally formed side by side on a semiconductor substrate, wherein a single semiconductor layer is buried in an interface area between the semiconductor laser and the optical waveguide.

Abstract: The integrated optical control element of this invention includes: a first waveguide for allowing light incident from outside to propagate therein; a multilayer structure for allowing the light which has propagated in the first waveguide to be incident thereon and for transmitting the light therethrough or reflecting the light therefrom, the multilayer structure including at least one layer having a refractive index different from an equivalent refractive index of a region with which the at least one layer is in contact; and a second waveguide for receiving at least part of the light transmitted through or reflected from the multilayer structure.

Abstract: An optical circuit element has a beam splitter which is formed with a plurality of grooves in optical waveguides, or formed in such a manner that the central axes of the waveguides to be coupled are set off from one another or the shape of the waveguides is modified. Further, an integrated type optical circuit device include: an optical circuit element having a plurality of optical waveguides on the input side and having a beam splitter which is formed with a plurality of grooves in the optical waveguides to split the light guided through the optical waveguides: and plural kinds of input light generating sources each arranged corresponding to one of the optical waveguides on the input side.