Abstract: A hydraulic control apparatus for a hybrid vehicle, which enables a smooth torque transmission when an engine of the vehicle is started from an idling stop state. The hydraulic control apparatus includes an engine and a motor as power sources, a transmission having a torque converter a clutch for a starting gear, an engine automatic stop and start device which is associated with the engine, a motor-driven oil pump for supplying oil pressure to the transmission, a brake pedal sensor, an accelerator pedal sensor, an engine revolution rate sensor. The oil pressure applied to the clutch is controlled to a level corresponding to a creeping torque when the engine is automatically stopped. When the brake pedal is released, the engine is automatically started, the accelerator pedal is not depressed, and the engine revolution rate is less than an idling revolution rate, the oil pressure applied to the clutch is maintained to the level corresponding to the creeping torque.

Abstract: A method for easily and quickly evaluating the wavelength variability properties of a wavelength-variable semiconductor laser is provided. An inspection device includes a power source for supplying current to a wavelength-variable DBR semiconductor laser having an active region, a phase control region, and a DBR region, a photo-detector for detecting an output intensity of laser beam emitted from the wavelength-variable DBR semiconductor laser, and a transmission type wavelength-selection element that can be inserted into a light path from the wavelength-variable DBR semiconductor laser to the photo-detector.

Abstract: A wavelength-variable semiconductor laser includes: a submount; and a semiconductor laser chip being mounted onto the submount and having at least an active layer region and a distributed Bragg reflection region, wherein the semiconductor laser chip is mounted onto the submount in such a manner that an epitaxial growth surface thereof faces the submount and a heat transfer condition of the active layer region is different from a heat transfer condition of the distributed Bragg reflection region. Moreover, an optical integrated device includes at least a semiconductor laser and an optical waveguide device both mounted on a submount, wherein the semiconductor laser is the wavelength-variable semiconductor laser as set forth above.

Abstract: An optical element is provided that includes a base substrate, a waveguide substrate, and a thin film layer that is provided between the base substrate and the waveguide substrate and that has a single-layer structure of a multilayer structure including a film containing Ta2O5 or Nb2O5 as a principal component.

Abstract: A light generating apparatus includes: a submount; a semiconductor laser chip mounted on the submount; a substrate which is mounted on the submount and includes an optical waveguide; and a substance having a predetermined thickness which is disposed between the semiconductor laser chip and the substrate. In an oscillation wavelength stabilizing apparatus for a light source, the light source is a semiconductor laser which includes: an active region for providing gain; and a distributed Bragg reflection (DBR) region for controlling an oscillation wavelength.

Abstract: The emission angle and emission position of coherent light source are controlled with high precision. A wavelength-variable DBR semiconductor laser (1) and an optical waveguide-type QPM-SHG device (2) are mounted on a submount (7), and the submount (7) is fixed inside a package (11), thus obtaining a coherent light source. Reference lines (A) and (B) serving as reference markers when fixing the submount (7) are formed on a submount fixing face of the package (11).

Abstract: An engine control device is provided, capable of restarting the engine when starting the vehicle rapidly and without giving any feeling of unease to the driver at the time of starting the vehicle by restarting the engine from the idle stop state.

Abstract: An optical waveguide element includes a three-dimensional optical waveguide of a bulky non-linear optical crystal, a substrate, and a joining layer made of an amorphous material. The substrate is joined to the optical waveguide via the joining layer.

Abstract: In a hybrid vehicle, power is transmitted via a torque converter provided with a lock-up clutch, and a force input through wheels during deceleration is transmitted to the motor via the torque converter so that a regenerative operation may be carried out by the motor to convert deceleration energy into regenerative energy. The hybrid vehicle includes a throttle opening degree detection unit which detects an opening degree of the throttle; a lock-up clutch engaging state determination unit which determines an engaged state of the lock-up clutch; and a lock-up clutch engagement control unit which controls an engagement of the lock-up clutch. The lock-up clutch engagement control unit, if the throttle opening degree detection unit detects a completely closed state of the throttle, controls the lock-up clutch so as to be engaged regardless of an engaged state of the lock-up clutch determined by the lock-up clutch engaging state determination unit.

Abstract: A semiconductor laser and an optical waveguide device with an optical waveguide formed at a surface of its substrate are provided on a submount. The semiconductor laser and the optical waveguide device are mounted with an active layer and a surface at which the optical waveguide is formed facing the submount, respectively. The submount is combined with the semiconductor laser or the optical waveguide device to form one body using an adhesive with a spacer, which maintains a substantially uniform distance therebetween, being interposed therebetween, so that position adjustment in the height direction can be made automatically and mounting can be carried out with high-precision optical coupling. Thus, an optical waveguide device integrated module and a method of manufacturing the same are provided, in which a semiconductor laser and a planar optical waveguide device are mounted with their positions in the height direction controlled with high precision.

Abstract: A semiconductor laser and an optical waveguide device with an optical waveguide formed at a surface of its substrate are provided on a submount. The semiconductor laser and the optical waveguide device are mounted with an active layer and a surface at which the optical waveguide is formed facing the submount, respectively. The submount is combined with the semiconductor laser or the optical waveguide device to form one body using an adhesive with a spacer, which maintains a substantially uniform distance therebetween, being interposed therebetween, so that position adjustment in the height direction can be made automatically and mounting can be carried out with high-precision optical coupling. Thus, an optical waveguide device integrated module and a method of manufacturing the same are provided, in which a semiconductor laser and a planar optical waveguide device are mounted with their positions in the height direction controlled with high precision.

Abstract: A control device for a hybrid vehicle is described which enables preventing a decrease in the efficiency of regeneration even when the revolution rate of an internal combustion engine is decreased during deceleration of the vehicle. The control device for a hybrid vehicle comprises an internal combustion engine and a motor connected in series with respect to each other, a torque converter which is connected to the rotational axis of the motor and which is provided with a lockup clutch, a transmission, a mechanical oil pump producing oil pressure for controllably operating the torque converter and the transmission, a motor-driven oil pump producing oil pressure for controllably operating the lockup clutch, and an ECU. The ECU operates the motor-driven oil pump depending on the deceleration state of the vehicle, and sets the lockup clutch in an engaged state. A method for operating the concerned control device is also described.

Abstract: In a short-wavelength laser module, long-term reliability is lost because of unnecessary gas deposited on the end face of its optical waveguide.

Abstract: A light generating apparatus includes: a submount; a semiconductor laser chip mounted on the submount; a substrate which is mounted on the submount and includes an optical waveguide; and a substance having a predetermined thickness which is disposed between the semiconductor laser chip and the substrate. In an oscillation wavelength stabilizing apparatus for a light source, the light source is a semiconductor laser which includes: an active region for providing gain; and a distributed Bragg reflection (DBR) region for controlling an oscillation wavelength.

Abstract: A semiconductor laser and an optical waveguide device with an optical waveguide formed at a surface of its substrate are provided on a submount. The semiconductor laser and the optical waveguide device are mounted with an active layer and a surface at which the optical waveguide is formed facing the submount, respectively. The submount is combined with the semiconductor laser or the optical waveguide device to form one body using an adhesive with a spacer, which maintains a substantially uniform distance therebetween, being interposed therebetween, so that position adjustment in the height direction can be made automatically and mounting can be carried out with high-precision optical coupling. Thus, an optical waveguide device integrated module and a method of manufacturing the same are provided, in which a semiconductor laser and a planar optical waveguide device are mounted with their positions in the height direction controlled with high precision.

Abstract: An optical waveguide of the present invention includes: a nonlinear optical crystal; a first ion exchange region provided in the vicinity of a portion of a surface of the nonlinear optical crystal; and a second ion exchange region provided in the surface of the nonlinear optical crystal. The second ion exchange region covers a greater area of the surface than an area covered by the first ion exchange region. The second ion exchange region includes a region having an extent of 0.02 &mgr;m to 0.2 &mgr;m along a depth direction in which an ion exchange ratio varies along the depth direction.

Abstract: The present invention aims to simplify a mass production process of an optical waveguide device and to reduce cost as well as noise. The optical waveguide device includes an optical waveguide whose entrance end face and exit end face are substantially parallel to each other. A SHG device is mass-produced by optically polishing an optical material substrate with a large area and then cutting the substrate. This method can mass-produce the optical waveguide devices having a uniform device length. The angle between the exit end face of the optical waveguide and the direction of an optical axis of the optical waveguide at the exit end face is not 90°, thereby reducing return light from the exit end face.

Abstract: An object of the present invention is to provide a laser source including a submount, an electrode portion formed on the submount, and a semiconductor laser fixed to the electrode portion by means of an adhesive portion, capable of improving the position accuracy of a laser beam emission portion of the semiconductor laser in the height direction. The electrode portion including an electrode for an active region, an electrode for a phase adjustment region, and an electrode for a DBR region is formed on the submount. A plurality of stopper portions also are formed on the submount. The semiconductor laser is fixed to the electrode portion (the electrode for an active region, electrode for a phase adjustment region, and electrode for a DBR region) by means of solder as an adhesive while being in contact with the stopper portions.

Abstract: An optical waveguide device comprises a substrate having first and second surfaces, and an optical waveguide provided on the first surface of the substrate, having a light-incoming facet and a facet inclined with respect to the optical waveguide. Guided light incident to the optical waveguide through the light-incoming facet is totally reflected off the inclined facet, and the guided light is transmitted through the first or second surface of the substrate.

Abstract: A laser beam as fundamental waves which is emitted from a distribution Bragg reflection (DBR) semiconductor laser is incident on an optical waveguide of a light wavelength conversion device in which domain-inverted regions and the optical waveguide are formed in an LiTaO3 substrate. The wavelength of the incident laser beam is then converted so as to obtain higher harmonic waves such as blue light. In the conversion, a drive current to be applied to a DBR portion of the DBR semiconductor laser is changed so as to change an oscillating wavelength of the DBR semiconductor laser, thereby matching the oscillating wavelength with a phase-matched wavelength of the light wavelength conversion device. Thus, the generation of the harmonic waves to be output is stably controlled.