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    • 3. 发明专利
    • Use method of single crystal substrate for optical functional element
    • 用于光功能元件的单晶基板的使用方法
    • JP2004163882A
    • 2004-06-10
    • JP2003166548
    • 2003-06-11
    • Yasunori FurukawaKenji KitamuraMasaru NakamuraNational Institute For Materials ScienceShunji Takegawa優 中村健二 北村保典 古川独立行政法人物質・材料研究機構俊二 竹川
    • FURUKAWA YASUNORIKITAMURA KENJITAKEGAWA SHUNJINAKAMURA MASARU
    • G02F1/37
    • PROBLEM TO BE SOLVED: To solve such a problem that in the manufacture of an optical functional element comprising a ferroelectric single crystal, a pyroelectric effect occurs in a once-produced polarization reversal part of a several microns in size during the heat treatment to eliminate distortion, and this results in fracture in the crystal or in changes in the size and the position of inversed polarization although the changes are small. SOLUTION: The optical functional element is produced by forming a polarization reversal structure at a temperature equal to or lower than the Curie temperature in a part of a ferroelectric single crystal substrate by using an electron beam scanning and irradiation method or a voltage application method, and the element controls the light passing through the above polarization reversal part. The optical functional element shows ≤2% propagation loss of the light passing through the polarization reversal part just after the polarization reversal structure is formed. As for the single substrate for the above element, a LiNbO 3 crystal having the composition with a constant molar ratio of Li/Nb or a nearly constant molar ratio in the range from 0.95 to 1.01 is used without heat treatment or by subjecting to the heat treating at ≤100°C. COPYRIGHT: (C)2004,JPO
    • 要解决的问题为了解决在制造包含铁电单晶的光功能元件的问题,在热处理期间在几微米尺寸的一次生产的偏振反转部分中发生热电效应 以消除变形,并且这导致晶体中的断裂或者反转极化的尺寸和位置的变化,尽管变化很小。 解决方案:通过使用电子束扫描和照射方法或电压施加在一部分铁电单晶衬底中在等于或低于居里温度的温度下形成极化反转结构来产生光功能元件 方法,并且元件控制通过上述偏振反转部分的光。 光功能元件在刚刚形成极化反转结构之后,通过极化反转部分的光的传播损耗≤2%。 对于上述元素的单个衬底,具有Li / Nb摩尔比恒定的摩尔比或0.95至1.01的几乎恒定摩尔比的组成的LiNbO 3 SB 3结晶体在没有热的情况下使用 或者在≤100℃进行热处理。 版权所有(C)2004,JPO
    • 4. 发明专利
    • Wavelength conversion element consisting of lithium tantalate single crystal
    • 波长转换元件包含钛酸锂单晶
    • JP2008176335A
    • 2008-07-31
    • JP2008039835
    • 2008-02-21
    • Yasunori FurukawaKenji KitamuraNational Institute For Materials ScienceShunji Takegawa健二 北村保典 古川独立行政法人物質・材料研究機構俊二 竹川
    • FURUKAWA YASUNORIKITAMURA KENJITAKEGAWA SHUNJIMIYAMOTO AKIOTERAO MASAKISUDA NOBORU
    • G02F1/37C01G35/00C30B29/30
    • PROBLEM TO BE SOLVED: To provide a wavelength conversion element consisting of lithium tantalate single crystal which maintains a characteristic similar to that of a lithium tantalate single crystal of a perfect stoichiometric composition even when having a nonstoichiometric defect. SOLUTION: The wavelength conversion element consists of the lithium tantalate single crystal which converts the wavelength of a laser beam made incident on the lithium tantalate single crystal having a periodically polarization-reversed structure into a shorter wavelength or a longer wavelength according to quasi phase matching on the basis of the periodically polarization-reversed structure, wherein the lithium tantalate single crystal contains at least one selected from the group of Mg, Zn, Sc and In by 0.1 to 3.0 mol%, the molar fraction of Li 2 O/(Ta 2 O 5 +Li 2 O) in the lithium tantalate single crystal is within a range of at least 0.490 and less than 0.500 and application voltage required for performing polarization inversion of the lithium tantalate single crystal at a room temperature is less than 3.5 kV/mm. COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:即使当具有非化学计量缺陷时,提供由钽酸锂单晶组成的波长转换元件,其保持与具有完美化学计量组成的钽酸锂单晶的特性相似的特性。 解决方案:波长转换元件由钽酸锂单晶构成,其将入射在具有周期性偏振反转结构的钽酸锂单晶的激光束的波长根据准的波长转换为更短的波长或更长的波长 基于周期性极化反转结构的相位匹配,其中钽酸锂单晶含有选自Mg,Zn,Sc和In中的至少一种为0.1〜3.0摩尔%,Li 钽酸锂单晶中的O /(Ta 2 5 2 2 O)在 至少0.490且小于0.500,并且在室温下进行钽酸锂单晶的极化反转所需的施加电压小于3.5kV / mm。 版权所有(C)2008,JPO&INPIT