Abstract: An aminopolycarboxylate is described, which is represented by the following formula (1): wherein M1, M2, M3 and M4 independently represent each an alkali metal ion. A process for producing the aminopolycarboxylate; a biodegradable chelating agent which comprises as the active component the aminopolycarboxylate; and a sequestering agent which comprises as the active component the aminopolycarboxylate are also described.

Abstract: A battery is provided which has a high capacity and can improve battery characteristics, such as cycle characteristics. The battery includes a spirally wound electrode body, wherein a cathode and an anode are wound with a separator in between. The anode includes, for example, simple substances, alloys, compounds of metal elements or metalloid elements capable of forming an alloy with Li, the like and combinations thereof. An electrolytic solution wherein an electrolyte salt is dissolved in a solvent is impregnated in the separator. For the electrolyte salt, a light metallic salt having B—O bond or P—O bond, such as difluoro[oxalato-O,O?]lithium borate and tetra fluoro[oxalato-O,O?]lithium phosphate, can be used. By forming a stable coating, decomposition reaction of the solvent can be inhibited, and reaction between the anode and the solvent can be prevented.

Abstract: The present invention provides a short resonator laser capable of high-speed operation with a low threshold value current and an element structure realizing a wavelength changeable laser having an excellent wavelength stability. A laser resonator waveguide is formed in such a manner that its lateral width is set to a wide value allowing lateral-multi mode at a part or the entire portion of the waveguide. This enables enhancement of a laser gain and reduction of electric resistance and thermal resistance while keeping the aforementioned characteristics of the short resonator laser. Here, by using self-focusing effect as a result of multi-mode interference effect, it is possible to reduce the mode conversion loss in the laser resonator and the light intensity distribution at the laser emitting end becomes a single-hill lowest order mode. Thus, it is possible to obtain a structure appropriate for connection with an optical fiber.

Abstract: A battery capable of improving battery characteristics such as cycle characteristics is provided. The battery includes a spirally wound electrode body including a cathode and an anode spirally wound with a separator in between. The capacity of the anode includes a capacity component by insertion and extraction of light metal and a capacity component by precipitation and dissolution of the light metal, and is represented by the sum of them. The separator is impregnated with an electrolyte solution formed through dissolving a lithium salt in a solvent. As the electrolyte salt, difluoro[oxalato-O,O′]lithium borate, tetrafluoro[oxalato-O,O′]lithium phosphate or difluorobis[oxalato-O,O′]lithium phosphate is used. By the formation of a stable coating, decomposition of the solvent and a reaction between precipitated lithium metal and the solvent can be prevented.

Abstract: The invention provides a manufacturing method of a laser diode having buried grown layer with less crystal defects and with low consumption power and having high reliability in a buried heterostructure laser diode using an InGaAlAs type material as an active layer, by preventing the inhibition of burying and regrowing of the active layer caused by oxidation of Al contained in the active layer. A manufacturing method of a semiconductor laser diode and the active layer comprises a material at least containing Al and having a buried hetero-cross sectional structure, formation of the buried heterostructure, comprising the steps of fabricating the active layer into a stripe shape or mesa shape by etching including at least wet etching, cleaning the stripe-shape sidewall of the core layer with a gas containing chlorine or other halogen element in a crystal growing apparatus and burying the active layer in the semiconductor.

Abstract: An object of the present invention is to realize an economical optical transmitter-receiver having a simple structure, which is suitable for a high-speed optical communication system. In addition, another object of the present invention is to achieve improvement in operation speed of a traveling-wave element, which uses a compound semiconductor in particular, using an easy technique. In the present invention, a high-frequency electric line on a mounting substrate becomes a traveling-wave electrode of a semiconductor optical element equivalently by the following steps: separately manufacturing the mounting substrate having the high-frequency electric line, and the semiconductor optical element for which high-frequency design has been applied beforehand; and then bonding and mounting (that is to say, junction down mounting) of drive electrodes of the mounting substrate and the semiconductor optical element through a soldering material.

Abstract: A resist stripper which comprises a peroxide and a quaternary ammonium salt.

Abstract: The present invention concerns an optical transmission apparatus and provides a wavelength tunable DBR laser diode capable of minimizing change in optical power upon wavelength tuning and having a broad wavelength tunable range. The present invention provides a wavelength tuning DBR laser diode of a waveguide type optical device in which an active waveguide and a distributed Bragg reflector are optically combined in a predetermined section on a semiconductor substrate wherein at least one quantum well layer independent of the active waveguide is formed at a portion or the entire portion of the distributed Bragg reflector.

Abstract: A confocal microscope comprises a light source emitting a polarized light beam, an objective lens irradiating the polarized light beam, which is deflected and scanned by the optical scanner, to the sample as an excitation light beam, a wavelength separator detecting a necessary wavelength band from a polarized fluorescence emitted from the sample which is excited by the polarized light beam, and a photodetector unit having a polarization property extractor extracting a fluorescence with a predetermined polarization property from the fluorescence detected with the wavelength separator, a wavelength selector selecting a wavelength of the fluorescence extracted by the polarization property extractor, and a photodetector detecting the fluorescence selected by the wavelength selector.

Abstract: The optical transmitter includes a semiconductor laser device, and an optical modulator region optically connected to the semiconductor laser device and having the function of modulating the output light from the semiconductor laser device. The operating temperature of the optical modulator region is changed without changing the oscillation wavelength of the semiconductor laser device.

Abstract: For achieving a transmission light source having different transmission properties or characteristics, i.e., the &agr; parameters, depending upon application thereof, in a light emission element of semiconductor EA modulator integrated type being constructed with a light emission portion for lasing with a single vertical mode and a plurality of EA modulators, wherein an absorption edge wavelength under the condition of applying no bias thereto, in the semiconductor multiple-quantum-well structure owned by the modulator which is near to an emission side of the light emission portion, is to be equal or longer than the absorption edge wavelength owned by the modulator positioned far from the emission side of the light emission portion.

Abstract: A one-package post-foaming oxidation hair dye composition containing uricase, uric acid, at least one oxidation dye, and at least one post-foaming agent is provided. The oxidation hair dye composition is packaged in a single package, and foams after spreading on hair.

Abstract: In order to form a wavelength tunable laser capable of tuning a wave over a wide range by simple control means, a thin film heater is mounted either over an upper electrode of a ridge waveguide semiconductor laser having ridge waveguides on a semiconductor substrate or over the semiconductor substrate and on both sides of the ridge waveguide with a gap of a few &mgr;m. By controlling a current passed to the thin film heater, the oscillation wavelength of the semiconductor laser is tuned. In the case where the thin film heater is mounted over an upper electrode of a ridge waveguide, a nonconductor is formed on both sides of the ridge conductor to more efficiently enable heat from the heater to reach an active layer of the ridge waveguide more efficiently.

Abstract: With the use of a wavelength multiplex light source capable of being adapted to a wavelength standard channel by an easy method, wavelength multiplex optical communication equipment is realized at a low cost and with excellent repeatability in performance. In a preferred implementation, a part of output light of a tunable light source 101 is guided to a wavelength stabilizer device where the difference thereof from a predetermined wavelength is detected with the use of photodetectors and a processor and fed back to the light source via controllers. Specifically, a controller 108 supplies a widely-variable output to an upper electrode of a heater-integrated tunable laser, which is formed by mounting a thin film heater just above the upper electrode of a distributed feedback (DFB) semiconductor laser that excels in wavelength controllability. The controller and compensates for the variance of the wavelength of the output light from the predetermined frequency using the output of the processor.

Abstract: For achieving a transmission light source having different transmission properties or characteristics, i.e., the a parameters, depending upon application thereof, in a light emission element of semiconductor EA modulator integrated type being constructed with a light emission portion for lasing with a single vertical mode and a plurality of EA modulators, wherein an absorption edge wavelength under the condition of applying no bias thereto, in the semiconductor multiple-quantum-well structure owned by the modulator which is near to an emission side of the light emission portion, is to be equal or longer than the absorption edge wavelength owned by the modulator positioned far from the emission side of the light emission portion.

Abstract: A device structure whereby an excellent tunable laser does not require a highly complicated wavelength control circuit, and delivers a high output, and excels in wavelength stability; and a structure of an optical module incorporating the laser; and a method for manufacturing the laser and the optical module. The wavelength of the laser is varied continuously with the single electric signal in the tunable wavelength range by setting the laser resonator length, the electric driving conditions of the laser at the time of tuning the wavelength, and the operating temperature to be in appropriate ranges, respectively. The device structure whereby improved laser gain, decreased electric resistance, and reduced heat resistance is attained by setting the waveguide width, particularly at part of or all parts of the laser resonator waveguide, to a wide width that allows multiple transverse modes to be sustained and setting both the width and the laser resonator length to appropriate values, respectively.

Abstract: An optical transmission device particularly adapted to a high-speed and large-capacity optical transmission system with a large optical output and excellent reflection resistance includes a waveguide-type optical element for emerging light and an optical transmission path that is to be optically coupled to the waveguide-type optical element. The waveguide-type optical element includes, at least in part thereof, a light-emitting portion having a gain-coupled diffraction grating and a mode-converting region integrated with the light-emitting portion.

Abstract: In a surface-emitting laser comprising an active region for emitting light and upper and lower DBR's sandwiching this active region from below and above to form resonators, a plurality of selective oxidation layers having an aperture which is an unoxidized region are formed in the upper DBR, lower DBR or both of them and the aperture is made wider stepwise as it becomes farther from the active region, thereby greatly reducing the capacitance of the laser. A high-speed optical module comprising the above surface-emitting laser as a light source has high performance, long service life and is inexpensive.

Abstract: Displays button or key images that correspond to a ten-key 11 arrangement on the screen 2 of a personal computer 1, and when a button or key image is selected, a level image that corresponds to the selected button or key image is displayed, so it is possible for an operator 3 to search for or transfer data by operating the ten-key 11 on a keyboard 10 for example.

Abstract: A one-package post-foaming oxidation hair dye composition containing uricase, uric acid, at least one oxidation dye, and at least one post-foaming agent is provided. The oxidation hair dye composition is packaged in a single package, and foams after spreading on hair.