Abstract: An optical semiconductor device according to the present disclosure includes a semiconductor substrate, at least one semiconductor laser provided on the semiconductor substrate, an optical multiplexer/demultiplexer circuit provided on the semiconductor substrate, multiplexing or demultiplexing first output light of the semiconductor laser and outputting second output light and third output light, a first waveguide portion provided on the semiconductor substrate, and outputting the second output light from an end face of the semiconductor substrate, and a second waveguide portion including an optical amplifier amplifying the third output light and a reflecting portion and provided on the semiconductor substrate, wherein the reflecting portion includes a diffraction grating that reflects the third output light amplified by the optical amplifier to feed back to the semiconductor laser via the optical amplifier and the optical multiplexer/demultiplexer circuit, and the semiconductor laser and the reflecting porti

Abstract: An optical device includes: lasers output first light from a front-end side and output second light from a rear-end side; an optical multiplexer circuit multiplex respective rays of the first light, to thereby send out output light; waveguides guide respective rays of the second light toward one end face of the optical device; and light detectors receive respective rays of reflected light that are due to reflection of the respective rays of the second light after being guided by the waveguides, on the one end face or on respective inclined end faces in concave portions formed on that one end face. The light detector is located between the rear-end side of the laser and the one end face or the inclined end face, and the second light is outputted diagonally relative to a perpendicular line with respect to the one end face or the inclined end face.

Abstract: Provided is an aqueous ink for ink jet that has excellent storage stability and whose viscosity does not easily increase even in a case where the ink is stored in a severe environment such as a high temperature condition. This aqueous ink for ink jet contains a coloring material and a block copolymer. The block copolymer includes an A block having a segment A having no acid group and a group represented by Formula (1) bonded to one terminal of the segment A, and a B block having a segment B having an acid group and a group represented by Formula (2) bonded to one terminal of the segment B. (In Formula (1), R1 represents an alkylene group, and M represents a hydrogen atom, an alkali metal, ammonium or organic ammonium. In Formula (2), R2 and R3 each independently represent an alkyl group or the like.

Abstract: An optical device includes: lasers output first light from a front-end side and output second light from a rear-end side; an optical multiplexer circuit multiplex respective rays of the first light, to thereby send out output light; waveguides guide respective rays of the second light toward one end face of the optical device; and light detectors receive respective rays of reflected light that are due to reflection of the respective rays of the second light after being guided by the waveguides, on the one end face or on respective inclined end faces in concave portions formed on that one end face. The light detector is located between the rear-end side of the laser and the one end face or the inclined end face, and the second light is outputted diagonally relative to a perpendicular line with respect to the one end face or the inclined end face.

Abstract: Provided is an aqueous ink for ink jet that has excellent storage stability and whose viscosity does not easily increase even in a case where the ink is stored in a severe environment such as a high temperature condition. This aqueous ink for ink jet contains a coloring material and a block copolymer. The block copolymer includes an A block having a segment A having no acid group and a group represented by Formula (1) bonded to one terminal of the segment A, and a B block having a segment B having an acid group and a group represented by Formula (2) bonded to one terminal of the segment B. (In Formula (1), R1 represents an alkylene group, and M represents a hydrogen atom, an alkali metal, ammonium or organic ammonium. In Formula (2), R2 and R3 each independently represent an alkyl group or the like.

Abstract: A processing apparatus includes a chuck table for holding a plate-like workpiece under suction. A suction unit is connected to the chuck table, and a processing unit is configured to process the workpiece while supplying processing water to the workpiece. The suction unit includes a first suction source, a first pipe providing fluid communication between the first suction source and the chuck table, a separator arranged in the first pipe, for separating a gas and a liquid drawn in from the chuck table, and a water discharging unit configured to discharge the liquid separated by the separator. The water discharging unit includes a second suction source, a second pipe providing fluid communication between the second suction source and a water discharge port of the separator, and a check valve arranged in the second pipe, for preventing a fluid from flowing from the second suction source to the separator.

Abstract: According to the present invention, a semiconductor device includes a substrate comprising a front end face, a rear end face and side faces, a plurality of semiconductor lasers provided on the substrate, a forward optical multiplexer to multiplex forward output light of the plurality of semiconductor lasers and output the multiplexed light to the front end face, a backward optical multiplexer to multiplex backward output light of the plurality of semiconductor lasers and output the multiplexed light to the rear end face and a plurality of backward waveguides connected to an output section of the backward optical multiplexer, wherein the plurality of backward waveguides includes a main waveguide disposed at a center of the output section and a plurality of lateral waveguides disposed on both sides of the main waveguide to bend toward the side faces and output light from the side faces diagonally to the side faces.

Abstract: There are provided a new compound which has the following general formula (1) and which is useful as a coloring material, an ink containing the compound, an ink cartridge containing the ink and an ink jet recording method including ejecting the ink from a recording head of an ink jet system to record an image on a recording medium.

Abstract: A processing apparatus includes a chuck table for holding a plate-like workpiece under suction. A suction unit is connected to the chuck table, and a processing unit is configured to process the workpiece while supplying processing water to the workpiece. The suction unit includes a first suction source, a first pipe providing fluid communication between the first suction source and the chuck table, a separator arranged in the first pipe, for separating a gas and a liquid drawn in from the chuck table, and a water discharging unit configured to discharge the liquid separated by the separator. The water discharging unit includes a second suction source, a second pipe providing fluid communication between the second suction source and a water discharge port of the separator, and a check valve arranged in the second pipe, for preventing a fluid from flowing from the second suction source to the separator.

Abstract: There are provided a new compound which has the following general formula (1) and which is useful as a coloring material, an ink containing the compound, an ink cartridge containing the ink and an ink jet recording method including ejecting the ink from a recording head of an ink jet system to record an image on a recording medium,

Abstract: Provided is an ink capable of recording an image that is excellent in ozone resistance, hardly causes blurring or color change even in a high-humidity environment, and is excellent in humidity resistance. The ink includes a coloring material and a lithium ion. The coloring material includes a compound represented by the following general formula (I) and a content of the lithium ion in the ink is 3.5 times or more in terms of molar ratio with respect to a content of the compound represented by the general formula (I).

Abstract: Provided is an ink capable of recording an image that is excellent in ozone resistance, hardly causes blurring or color change even in a high-humidity environment, and is excellent in humidity resistance. The ink includes a coloring material and a lithium ion. The coloring material includes a compound represented by the following general formula (I) and a content of the lithium ion in the ink is 3.5 times or more in terms of molar ratio with respect to a content of the compound represented by the general formula (I).

Abstract: The present invention is a colorant compound represented by the following general formula (1): wherein at least one of R2, R4, R7 and R9 is an acylamino group represented by the following general formula (2): wherein R11 denotes one of an alkyl group, a cycloalkyl group, an aryl group, an arylalkyl group, an alkenyl group and a heterocyclic group; and ‘*’ denotes a bonding site with an aromatic ring of the general formula (1).

Abstract: The present invention is a colorant compound represented by the following general formula (1): wherein at least one of R2, R4, R7 and R9 is an acylamino group represented by the following general formula (2): wherein R11 denotes one of an alkyl group, a cycloalkyl group, an aryl group, an arylalkyl group, an alkenyl group and a heterocyclic group; and ‘*’ denotes a bonding site with an aromatic ring of the general formula (1).