摘要:
A group-III nitride semiconductor laser device with excellent optical characteristics and its manufacturing method are provided. The method does not include steps that require high assembly precision. The group-III nitride semiconductor laser device comprises a substrate which has a cut-out portion. A laser facet of a multi-layer body is located near the cut-out portion of the substrate.
摘要:
An information recording/reproducing apparatus of the invention is equipped with an objective lens, a light source and a variable optical element having a grating which demonstrates a piezo-electric effect by means of an electric field. The light source emits and irradiates a laser beam onto the grating to generate a 0th order diffraction beam and +/− 1st order diffraction beams in accordance with first order diffraction efficiency, and the objective lens converges the 0th diffraction beam and +/− 1st order diffraction beams which are irradiated onto an information recording medium for the purpose of information recording or information reproducing. By controlling an electric field applied to the grating, the first order diffraction efficiency of the grating is adjusted, whereby light beams are generated which have power levels appropriate for various kinds of information recording media.
摘要:
A radiation thermometer capable of precise measurement without depending upon an absolute precision of an infrared ray sensor for detecting infrared ray or a temperature sensor for measuring a temperature of the infrared ray sensor is provided wherein, controlling means retains a reference temperature for the measurement object, a sensor reference temperature for the sensor, and a sensor reference output for the sensor output when infrared ray radiated from the object of measurement having the object of measurement reference temperature is detected by the infrared ray sensor having the sensor reference temperature, and calculates the temperature of measurement object based on a first difference as a difference between a sensor temperature to be measured by the sensor temperature measuring portion and a sensor reference temperature, a second difference as a difference between a sensor output to be detected by the infrared ray sensor and a sensor reference output and the object of measurement reference temperature.
摘要:
A group III nitride semiconductor device producing method is constructed by: a step of forming a first crystal layer made of a group III nitride semiconductor (AlxGa1−x)1−y.InyN (0≦×≦1, 0≦y≦1) doped with a group II impurity element; a step of a second crystal layer made of a group III nitride semiconductor AlzGa1−zN (0.7≦z≦1) onto the first crystal layer; and a step of removing at least a part of the second crystal layer by etching after the formation of the first and second crystal layers.
摘要翻译:III族氮化物半导体器件的制造方法是通过以下步骤构成的:形成由III族氮化物半导体(Al x Ga 1-x)1-y.InyN(0≤x≤1,0
摘要:
A nitride semiconductor light emitting device having preferable light emitting characteristics even if dense threading dislocations extend through single crystal layers. The nitride semiconductor light emitting device includes an active layer obtained by depositing group-3 nitride semiconductors, and a barrier layer disposed adjacent to the active layer and having a greater bandgap than that of the active layer, the active layer having barrier portions which surround the threading dislocations and are defined by interfaces enclosing the threading dislocation and which are made of the same material as that of the barrier layer.
摘要:
In a semiconductor light-emitting device having a multilayered structure which consists essentially of layers of Group III nitride semiconductors (AlxGa1−x) 1−yInyN (0≦x≦1, 0≦y≦1) which are different from each other in chemical composition ratio, generation of cracks at an interface propagating from an interface between adjacent layers is prevented. Two adjacent layers within the multilayered structure, which include a lower layer having a lattice constant larger than a lattice constant of an upper layer of the two adjacent layers, have a portion close to the interface of the two adjacent layers doped such that an element different from the Group III nitride semiconductors is added in a higher concentration, i.e. in a higher distribution density than in other portions thereof.
摘要翻译:在具有多层结构的半导体发光器件中,其基本上由III族氮化物半导体(Al x Ga 1-x)1-y In y N(0 <= x <= 1,0 <= y <= 1) 彼此之间的化学组成比,防止了从相邻层之间的界面传播的界面产生裂纹。 多层结构中的两个相邻层,其包括具有大于两个相邻层的上层的晶格常数的晶格常数的下层,具有靠近所述两个相邻层的界面的部分,所述界面被掺杂,使得元件不同 从III族氮化物半导体中加入更高的浓度,即比其它部分更高的分布密度。
摘要:
An inspection system for assemblies, especially for flash units of used film packages as to if the flash units are reusable. The inspection system circulates pallets each holding a flash unit in a predetermined posture around a plurality of inspection stations for various inspection items. Inspection data detected in each inspection station is written in a memory of the pallet through a data communication system disposed in each pallet and each inspection station. A computer reads the memory for classifying the flash unit on the basis of the inspection data on all inspection items and writes classification data in the memory. A plurality of electrical inspection apparatuses are disposed in the inspection system for simultaneously inspecting electrical properties of a plurality of flash units. Each inspection apparatus has proving pins, an actuator and a photo-sensor which are moved into their operative positions when the pallet holding the flash unit is stopped at the inspection apparatus, wherein the inspection apparatus charges a main capacitor with a high D.C. voltage while measuring the voltage of the main capacitor.
摘要:
A curing composition and a method for impregnating wood using the curing composition, which comprises a reaction product represented by formula (1) obtained by reacting an alkylene oxide adduct of a hydrocarbon polyol and (meth)acrylic acid: ##STR1## wherein R.sup.10 represents a residual group of a hydrocarbon polyol having from 3 to 15 carbon atoms and (c1+d1) hydroxyl groups; R.sup.11 represents an alkylene group having from 2 to 4 carbon atoms; R.sup.12 represents an alkylene group having from 2 to 4 carbon atoms; R.sup.13 represents a hydrogen atom or a methyl group; a1 represents a number of from 0 to 10; b1 represents a number of from 0 to 10; c1 represents a number of not less than 1.5; and d1 represents a number of not less than 0.5; provided that (a1+b1) is not less than 1.
摘要翻译:固化组合物和使用该固化组合物浸渍木材的方法,其包括通过使烃多元醇的烯化氧加合物与(甲基)丙烯酸反应获得的式(1)表示的反应产物:其中 R 10表示碳原子数3〜15的烃多元醇和(c1 + d1)羟基的残基, R11表示碳原子数2〜4的亚烷基。 R 12表示碳原子数2〜4的亚烷基。 R 13表示氢原子或甲基; a1表示0〜10的数; b1表示0〜10的数; c1表示不小于1.5的数; d1表示不小于0.5的数; (a1 + b1)不小于1。
摘要:
Disclosed is a process for forming a polarization inversion layer which can form a periodic metal pattern on one major surface of a substrate and can easily form a fine periodic domain inversion structure. According to this process for forming polarization inversion layer, before or after the step of forming a three-dimensional waveguide, plural pairs of ground anodes and voltage-applying cathodes are formed at predetermined intervals, each pair sandwiching the three-dimensional waveguide along the extending direction thereof, facing each other, and set apart from each other, on one major surface of the substrate parallel to an axial direction where polarization inversion easily occurs, an electron beam is irradiated to the cathodes with the anodes grounded to thereby form a plurality of polarization inversion layers along the extending direction of the three-dimensional waveguide.
摘要:
A wavelength conversion element comprises a laser oscillation portion provided with an active layer waveguide formed of a material of III-V group in a periodic table and an output waveguide path portion provided with an output waveguide. The output waveguide path portion is further provided with a buffer layer between the output waveguide and the active layer waveguide having a thickness suitable for propagation of an evanecsent wave from the active layer waveguide to the output waveguide. In result, a wavelength conversion efficiency of a second harmonic can be remarkably improved, and a process of manufacturing the wavelength conversion element becomes more easy.