Abstract: Disclosed compound semiconductor light emitting devices have a substrate, a compound semiconductor layer, formed on the substrate, containing a first conductive type clad layer, an active layer, and a second conductive type clad layer, and a resonator structure formed of two opposing facets of the compound semiconductor layer, wherein surfaces of the first conductive type clad layer, the active layer, and the second conductive type clad layer forming the facet of the compound semiconductor are covered with a passivation layer, wherein at least one element constituting the facet of the compound semiconductor layer is not coupled to oxygen, and wherein a portion of the passivation layer adjacent to the facet of the compound semiconductor layer contains oxygen as a structural element.

Abstract: The present invention discloses a semiconductor light emitting device comprising at least one semiconductor light emitting element of edge-emission type, a first heat sink and a second heat sink, wherein at least apart of an electrode for the first-conduction-type semiconductor of the semiconductor light emitting element is in contact with the first heat sink; at least a part of an electrode for the second-conduction-type semiconductor of the semiconductor light emitting element is in contact with the second heat sink; and the first heat sink and the second heat sink are in contact with each other in a junction overlooking one of the two side planes which do not compose the facets of the cavity in the semiconductor light emitting element.

Abstract: Compound semiconductor light emitting devices capable of suppressing the surface state density on the facets of semiconductor light emitting devices such as semiconductor lasers for a long time and stable operating even when the passivation layer diffuses can be easily obtained. Compound semiconductor light emitting devices with an emission wavelength of &lgr; (nm) wherein a first conduction type of clad layer, an active layer and a second conduction type of clad layer are grown on a substrate and two facets are opposite to each other so as to form a cavity, characterized in that said active layer is transparent to the emission wavelength in the vicinities of the facets and that the surfaces of the first conduction type of clad layer, active layer and second conduction type of clad layer forming said facets are each coated with a passivation layer.

Abstract: Compound semiconductor light emitting devices capable of suppressing the surface state density on the facets of semiconductor light emitting devices such as semiconductor lasers for a long time and stable operating even when the passivation layer diffuses can be easily obtained. Compound semiconductor light emitting devices with an emission wavelength of &lgr; (nm) wherein a first conduction type of clad layer, an active layer and a second conduction type of clad layer are grown on a substrate and two facets are opposite to each other so as to form a cavity, characterized in that said active layer is transparent to the emission wavelength in the vicinities of the facets and that the surfaces of the first conduction type of clad layer, active layer and second conduction type of clad layer forming said facets are each coated with a passivation layer.

Abstract: The present invention relates to a semiconductor laser diode comprising a GaAs substrate and at least a first conduction-type clad layer, an active layer containing In, Ga and As as component elements, a second conduction-type first clad layer, a current block layer and a second conduction-type second clad layer which are deposited on the substrate in order, wherein a current injection region is formed by said current block layer and said second conduction-type second clad layer, the effective refractive index step &Dgr;neff in the horizontal direction is from 2.5×10−3 to 5.0×10−3 at the emission wavelength, and the width W of the current injection region is from 1.5 to 2.5 &mgr;m. The semiconductor laser diode of the present invention is suited for uses where high output and long life-time are required, such as excitation light source for optical fiber amplifiers.

Abstract: The disclosure describes a method of forming a groove in a structure of a semiconductor laser diode, which comprises a crystal growth procedure of epitaxial growth of a core layer comprising MP, wherein M represents one or more of elements belonging to group IIIb of periodic table and an upper layer comprising MAs, wherein M represents one or more of elements belonging to group IIIb of periodic table, successively on (100) surface of MAs crystals in a lower layer comprising MAs; a photolithography and wet etching procedure of, after forming an etching mask on the upper layer, forming an etching window to the etching mask; a first etching procedure of selective etching the upper layer; and a second etching procedure of selective etching other faces except for the face in which (111) face of MP crystals in the core layer is exposed.

Abstract: The invention provides a semiconductor device having a structure wherein a layer comprising at least Al.sub.W Ga.sub.1-W As is formed on a substrate and a second etching stop layer, a first etching stop layer and a layer comprising Al.sub.Y Ga.sub.1-Y As are deposited on the layer comprising Al.sub.W Ga.sub.1-W As in the described order, with a portion of the layer comprising Al.sub.Y G.sub.1-Y As and a portion of the first etching stop layer being removed. This structure enables a desired ridge shape to be fabricated with good quality and allows for free selection of the Al mixed crystal ratio of the layer to be etched, and makes it possible to form the re-growth interface of GaAs. Thus, the qualty of crystal of the re-grown portion can be improved.

Abstract: The disclosure described a semiconductor laser diode comprising at least a first clad layer, an active layer and a second clad layer disposed in this order on the substrate, anda buried layer for current blocking disposed at both sides in the cavity direction of the active layer,at least one of the first clad layer and second clad layer having at least one superlattice in the direction parallel with the substrate, and the average refractive index (nc1) of the first clad layer, the refractive index (na) of the active layer and the average refractive index (nc2) of the second clad layer satisfying the following equations.

Abstract: The disclosure describes a method of forming a groove in a structure of a semiconductor laser diode, which comprises a crystal growth procedure of epitaxial growth of a core layer comprising MP, wherein M represents one or more of elements belonging to group IIIb of periodic table and an upper layer comprising MAs, wherein M represents one or more of elements belonging to group IIIb of periodic table, successively on (100) surface of MAs crystals in a lower layer comprising MAs; a photolithography and wet etching procedure of, after forming an etching mask on the upper layer, forming an etching window to the etching mask; a first etching procedure of selective etching the upper layer; and a second etching procedure of selective etching other faces except for the face in which (111) face of MP crystals in the core layer is exposed.