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公开(公告)号：JP2002167299A
公开(公告)日：2002-06-11
申请号：JP2000363532
申请日：2000-11-29
Applicant: HITACHI METALS LTD , NAT INST FOR MATERIALS SCIENCE
Inventor： MIYAMOTO AKIO , KITAMURA KENJI , FURUKAWA YASUNORI , TAKEGAWA SHUNJI
Abstract: PROBLEM TO BE SOLVED: To provide a method of manufacturing a single crystal of LiNb1-xTaxO3 (0 =30 wt.% has particle size of >=500 μm.
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公开(公告)号：JP2002167297A
公开(公告)日：2002-06-11
申请号：JP2000363531
申请日：2000-11-29
Applicant: HITACHI METALS LTD , NAT INST FOR MATERIALS SCIENCE
Inventor： MIYAMOTO AKIO , KITAMURA KENJI , FURUKAWA YASUNORI , TAKEGAWA SHUNJI
Abstract: PROBLEM TO BE SOLVED: To provide an optical device which is highly efficient at a wavelength of about 300 nm, and a stable optical device using the above. SOLUTION: The lithium tantalate single crystal is grown in a melt which contains more Li than its proportional composition. Na content in the crystal is
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3.发明专利
公开(公告)号：JP2001287999A
公开(公告)日：2001-10-16
申请号：JP2000341130
申请日：2000-11-08
Applicant: NAT INST FOR MATERIALS SCIENCE , FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI
Inventor： FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI , MIYAMOTO AKIO , TERAO MASAKI , SUDA NOBORU
Abstract: PROBLEM TO BE SOLVED: To solve the problem that the improvement of the device performance is limited because an available conventional lithium tantalate single crystal has a congruent composition including several percentage of disproportionation defect although the lithium tantalate single crystal is expected as a material for an optical element because the single crystal having excellent optical characteristics, a large caliber and high composition homogeneity can be supplied at a comparatively inexpensive price. SOLUTION: This lithium tantalate single crystal grown from a molten liquid having a composition containing excess Li compared to the fixed ratio composition, and having >=0.490 and
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公开(公告)号：JP2003171199A
公开(公告)日：2003-06-17
申请号：JP2001365912
申请日：2001-11-30
Applicant: NAT INST FOR MATERIALS SCIENCE
Inventor： KITAMURA KENJI , TAKEGAWA SHUNJI , NAKAMURA MASARU , FURUKAWA YASUNORI , KAKIMOTO KOICHI
Abstract: PROBLEM TO BE SOLVED: To provide a mean for surely manufacturing a single crystal having a large diameter and free from inclusions. SOLUTION: A lithium niobate single crystal or lithium tantalate single crystal having a large diameter and free from inclusions such as air bubbles is obtained by applying an accelerated crucible rotation technique (ACRT) comprising changing the rotation number or the rotation direction of a crucible to a single crystal growth technique based on a double crucible method, and thereby, controlling the movement of the crucible and enhancing the agitation effect. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2002072267A
公开(公告)日：2002-03-12
申请号：JP2000255253
申请日：2000-08-25
Applicant: NAT INST FOR MATERIALS SCIENCE , FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI , NAKAMURA MASARU
Inventor： FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI , NAKAMURA MASARU
Abstract: PROBLEM TO BE SOLVED: To highly precisely and uniformly form a polarization inversion struc ture without any optical distortion. SOLUTION: The optical functional element is obtained by forming the polarization inversion structure at the temperature lower than the Curie temperature by using an electron beam scanning irradiation method or voltage application method in a part of a ferroelectric single crystal substrate preparedly using LiNbO3 crystal having 0.95 to 1.01 molar ratio of Li/Nb as the substrate, and the optical functional element controls the light passing through the polarization inversion part. By this method,
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Patent Agency Ranking
公开(公告)号：JP2001264554A
公开(公告)日：2001-09-26
申请号：JP2000075318
申请日：2000-03-17
Applicant: MATSUSHITA ELECTRIC IND CO LTD , NAT INST FOR MATERIALS SCIENCE , KITAMURA KENJI , FURUKAWA YASUNORI , TAKEGAWA SHUNJI
Inventor： MIZUUCHI KIMINORI , YAMAMOTO KAZUHISA , KITAMURA KENJI , FURUKAWA YASUNORI , TAKEGAWA SHUNJI
Abstract: PROBLEM TO BE SOLVED: To provide an optical device that a large change amount in the refractive index can be obtained by using a proton exchange layer formed in a stoichiometric LN crystal, the characteristics of the optical device are improved, the scattering loss in the proton exchange layer is decreased and the optical constant in the proton exchange layer is improved. SOLUTION: The optical device has a nearly stoichiometric LiNbPO3 crystal substrate having the molar ratio of Li/Nb ranging from 0.95 to 1.01 and a proton exchange layer formed near the surface of the crystal. The proton exchange is performed by dipping the substrate in a heated pyrophosphoric acid. The surface layer of the LiNbO3 crystal substrate is exchanged with protons (H+) to form HLiNbO3 and a large difference in the refractive index between the LN crystal substrate and the proton exchange layer is obtained.
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7.发明专利
公开(公告)号：JP2002090785A
公开(公告)日：2002-03-27
申请号：JP2000281878
申请日：2000-09-18
Applicant: NAT INST FOR MATERIALS SCIENCE , FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI , NAKAMURA MASARU
Inventor： FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI , NAKAMURA MASARU
Abstract: PROBLEM TO BE SOLVED: To uniformly form a polarization inversion structure free of optical distortion with good accuracy. SOLUTION: This optical function element is constituted by forming the polarization inversion structure at a temperature below a Curie temperature in part of a ferroelectric single crystal substrate formed by using an LiTaO3 crystal ranging from 0.95 to 1.02 in the molar ratio of Li/Ta as a substrate by using an electron beam scanning irradiation method or voltage impression method and controlling the light past this polarization inversion structure. Propagation loss of
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8.发明专利
公开(公告)号：JP2002068883A
公开(公告)日：2002-03-08
申请号：JP2000253027
申请日：2000-08-23
Applicant: CRYSTAL SYSTEM KK , NAT INST FOR MATERIALS SCIENCE , KITAMURA KENJI , FURUKAWA YASUNORI , TAKEGAWA SHUNJI
Inventor： SHINDO ISAMU , KIMURA SHINJI , KITAMURA KENJI , FURUKAWA YASUNORI , TAKEGAWA SHUNJI
Abstract: PROBLEM TO BE SOLVED: To provide a single crystal manufacturing apparatus which is capable of continuously and smoothly supplying raw material powder of always the same weight while growing a single crystal and is accordingly capable of manufacturing the large-sized single crystal having a homogenous composition and a desired diameter and a method of manufacturing the single crystal using the same. SOLUTION: A respective amount of the raw material powder is temporarily transferred to a raw material powder supplying tray member form a raw material storage section in a position apart from a crucible for manufacturing the single crystal and the raw material powder supplying tray member is moved to a dissolving vessel and is tilted and rotated, by which the raw material powder transferred to the raw material powder supplying tray member is supplied to the dissolving vessel.
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公开(公告)号：JP2002060296A
公开(公告)日：2002-02-26
申请号：JP2000250292
申请日：2000-08-21
Applicant: CRYSTAL SYSTEM KK , NAT INST FOR MATERIALS SCIENCE , FURUYA KINZOKU KK
Inventor： SHINDO ISAMU , KITAMURA KENJI , TAKEGAWA SHUNJI , FURUKAWA YASUNORI , NAKAMURA MASARU , FURUYA AKITAMI
IPC: C30B15/10
Abstract: PROBLEM TO BE SOLVED: To provide a crucible and an apparatus for producing a single crystal, capable of independently controlling the temperatures of a melting tank and a growing tank and realizing the temperature distribution at the inside of the growing tank, providing a heat convection ideal for a pulling method and with which a large scale single crystal having a uniform composition and a prescribed target diameter can be produced, and to provide a method of producing the same using the same. SOLUTION: In the crucible for producing the single crystal, the melting tank is connected to the outside, from the middle of the side wall of the growing tank and communicatable flow holes are formed in the sidewall of the growing tank so that molten liquid can flow in or out between the inside of the melting tank and the inside of the growing tank. The single crystal can be obtained by supplying a powdery raw material into the melting tank of the crucible, mentioned above, for producing the single crystal, then melting the raw material, dipping a seed crystal into a melt flowing-in from the melting tank and pulling up the single crystal while growing the single crystal.
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10.发明专利
公开(公告)号：JP2003267798A
公开(公告)日：2003-09-25
申请号：JP2000341132
申请日：2000-11-08
Applicant: NAT INST FOR MATERIALS SCIENCE , FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI
Inventor： FURUKAWA YASUNORI , KITAMURA KENJI , TAKEGAWA SHUNJI , MIYAMOTO AKIO , TERAO MASAKI , SUDA NOBORU
Abstract: PROBLEM TO BE SOLVED: To provide a method for improving the element performance of a lithium niobate single crystal which has been expected as the material for optical elements because it has excellent optical properties and a single crystal having a large diameter and high uniformity of composition can be supplied relatively easily, but has been limited in the improvement of the element performance due to the congruent composition containing several percents of non- stoichiometric defects in the conventional commercial lithium niobate single crystals. SOLUTION: The lithium niobate single crystal is grown from a melt having a composition containing Li more than the stoichiometric composition. The lithium niobate single crystal contains 0.1-3 mol% of at least one element of Mg, Zn, Sc and In. The lithium single crystal has a molar fraction of the formula: Li 2 O/(Nb 2 O 5 +Li 2 O) of from 0.490 to less than 0.500. The optical device using the lithium niobate single crystal and a method for producing the same are also provided. COPYRIGHT: (C)2003,JPO
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