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公开(公告)号：JP2000058976A
公开(公告)日：2000-02-25
申请号：JP22708898
申请日：1998-08-11
Applicant: AGENCY IND SCIENCE TECHN
Inventor： CHO SHIKO , NAKAGAWA ITARU , ITAYA TARO , SUGAYA TAKEYOSHI , TORITSUKA KENJI
Abstract: PROBLEM TO BE SOLVED: To manufacture a wide band semiconductor saturable absorption reflector having high reflectance by additionally providing a thin film of a dielectric substance transparent to light in a specified wavelength range and exhibiting refractive index lower than that of a semiconductor multiplayer film structure for the light in the specified wavelength range between a metal face and a semiconductor multilayer film structure. SOLUTION: A transparent substance 7 having different refractive index is arranged between the metallic reflective film 3 of a wide band semiconductor saturable absorption reflector and semiconductor layers 4, 5, 6 in order to enhance reflectance. The transparent substance 7 must be transparent over the entire wavelength range of optical spectrum in a pulse laser utilizing a wide band semiconductor saturable absorption reflector. In order to attaing a significant effect, refractive index of the transparent substance must be sufficiently lower than that of the semiconductor layers 4, 5, 6 and sufficiently higher than that of the metal. A substance having such a refractive index can be selected generally among so-called dielectrics.
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Patent Agency Ranking
公开(公告)号：JPH01185990A
公开(公告)日：1989-07-25
申请号：JP1123388
申请日：1988-01-21
Applicant: AGENCY IND SCIENCE TECHN , ANRITSU CORP
Inventor： YAMASHITA MIKIO , TORITSUKA KENJI , KOUNO YOUZOU , UEDA KENJI , HIGASHIKUBO KOICHI
Abstract: PURPOSE:To form steep slits each of which has a knife edge-shaped head section through a crystal substrate in large quantities and easily using a batch processing, by utilizing a mesa structure. CONSTITUTION:A protective film is formed on the surface of a crystal base material, and the protective film is then selectively removed to form slit-shaped holes. Thereafter, the surface of the crystal base material which is exposed through the slit-shaped holes is etched by an anisotropic etchant to form slit holes through the crystal base material, and thereby a crystal slit plate 2 is produced. Subsequently, the crystal slit plate 2 is bonded to an opening section 4 of a flow passage hollow 3, with which a nozzle main body 1 is formed and through which liquid is caused to flow from the inside to the head section, so that the liquid is discharged through the slit holes. Thus, the steep slits 2 each of which has a knife edge-shaped head section can be formed through the crystal substrate (the crystal base material), using the protective film which is formed on the surface of the crystal and has the holes with any slit shape as a mask pattern, in large quantities and easily, by utilizing a mesa structure determined by a crystal structure and by a batch processing using a photolithography technique.
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公开(公告)号：JPS62157013A
公开(公告)日：1987-07-13
申请号：JP29910785
申请日：1985-12-28
Applicant: AGENCY IND SCIENCE TECHN
Inventor： TORITSUKA KENJI , YAMASHITA MIKIO
Abstract: PURPOSE:To compress effectively even laser pulses having a low peak light intensity by using a fiber where materials having a nonlinear refractive index lower than that of a glass fiber are enclosed in the core part. CONSTITUTION:A hollow fiber 1A is used where the diameter of the hollow part is several mu and that of the clad part is >=0.1mm. The whole of this fiber is fixed in a cell 3 filled up with an organic liquid 2. an incidence window 4 and an exit window 5 for light passage are attached to the cell 3 in directions of both ends of the fiber 1A. In an optical pulse compressor using the hollow fiber 1A where the organic liquid 2 is enclosed, materials having a nonlinear refractive index lower than that of materials used in a conventional compressor using the glass fiber can be selected and used. Thus, the spectrum width of even a laser light having a low peak power is extended by a sufficient nonlinear refracting effect to make the pulse compression possible.
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公开(公告)号：JPS6350400A
公开(公告)日：1988-03-03
申请号：JP18955086
申请日：1986-08-14
Applicant: AGENCY IND SCIENCE TECHN , FUJIKURA LTD
Inventor： YAMASHITA MIKIO , TORITSUKA KENJI , SHIODA TAKAO , HIDAKA HIROMI
Abstract: PURPOSE:To produce the title org. single crystal fiber with controlled crystal orientation by charging an org. crystal material having a nonlinear optical effect in a capillary, and locally and gradually heating and melting the material to crystallize the material along the crystal orientation of the seed crystal. CONSTITUTION:The heated and melted org. crystal material [meta-nitroaniline (m-NA), etc.] is charged in a specified amt. from the opening on one end of the capillary consisting of a high-refractive index glass such as LaK13, gradually cooled at ordinary temp., and solidified. The solidified org. crystal material is locally heated and melted from one end side by the spot irradiation of laser light, etc., and the irradiated part is successively moved toward the other end side at a moderate speed. At this time, the seed crystal of the org. crystal material is deposited on the initially spot-irradiated part which is slowly cooled, and the material is crystallized along the crystal orientation of the seed crystal. As a result, the org. single crystal fiber with controlled crystal orientation and having a waveguide consisting of the org. crystal material is obtained.
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公开(公告)号：JPH04172426A
公开(公告)日：1992-06-19
申请号：JP30067590
申请日：1990-11-06
Applicant: AGENCY IND SCIENCE TECHN
Inventor： HIRAGA TAKASHI , MORIYA TETSUO , YAMASHITA MIKIO , TORITSUKA KENJI
Abstract: PURPOSE:To reduce both the size of a heterogeneous portion in a macromolecular thin film and uneveness of the surface of the thin film to below micrometer so as to obtain an optically transparent material which causes little loss by scattering by impregnating the macromolecular thin film with solute molecules having various optical functions, the thin film having micro holes therein and being capable of holding other atoms or molecules in the holes. CONSTITUTION:A thin film of regenerated cellulose made from viscose is immersed in an acetone saturated solution (1.2 mol/1) of MNA (2-Methyl-4-Nitroaniline) for 4 to 5 hours and the MNA attached to the surface of the film is lightly wiped off by using ethanol and the like and the surface is dried to obtain a thin film sample and then the amount of the MNA with which the sample is impregnated is about 0.26 mol/1 according to light absorption spectre measurement and the thickness of the thin film sample is changed by such a degree as being negligible. This indicates that the MNA with which the film is impregnated is held in micro holes existing within the thin film of regenerated cellulose. When an appropriate tensile load is exerted on the thin film 1 of regenerated cellulose by a spring 2, the orientation property of the MNA in the macromolecular thin film is remarkably promoted by drawing operation and a medium of good quality for propagation of light with a duration of a femtosecond or so is obtained.
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公开(公告)号：JPH0499609A
公开(公告)日：1992-03-31
申请号：JP7948190
申请日：1990-03-28
Applicant: AGENCY IND SCIENCE TECHN
Inventor： HIRAGA TAKASHI , MORIYA TETSUO , ONISHI NORIO , YAMASHITA MIKIO , TORITSUKA KENJI
Abstract: PURPOSE:To allow the titled film to be a good quality medium for propagating pulse lights having a width of the order of femto-seconds by uniformly dispersing a soluble compound in a solvent polymer compound on a substrate for forming a film, and thereafter subjecting the film to a hot rolling process while adding one directional shearing stresses. CONSTITUTION:A soluble compound and solvent polymer compound are added into a solvent, and the solution obtained is dropped on a glass substrate, and then the glass substrate is mounted on a high-speed rotating disk for forming a film sample. It is quietly left under room temperatures for three days for conducting preliminary drying, and then subjected to a treatment for two hours at 100 deg.C under vacuum conditions. Voids in the sample generated during the drying process are treated by a vacuum hot rolling device in the form of being held by another substrate with the same quality. The film sample 6 is charged within a vacuum vessel 1 for carrying out vacuum air discharging to it by a vacuum air discharging device 5 under room temperature for 30mins., and then it is heated by a heating device 2 at the rate of 50 deg.C/mins., and at the time when it reaches 100 deg.C, vacuum air discharging is stopped and the vacuum condition is maintained herein so as to perform further heating, and at the time when it reaches 150 deg.C, hydrostatic pressure of 50kg/cm is applied thereto by means of a hydraulic press main body, and after it is held for 10mins. cooling is effected at the rate of 100 deg.C/hr.
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