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    • 2. 发明公开
    • Electric field sensor and adjustment method thereof
    • Elektrofeldsensor und Einstellverfahrendafür
    • EP1921458A2
    • 2008-05-14
    • EP08003680.9
    • 2004-07-28
    • NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    • Sasaki, AiichirouShinagawa, MitsuruShibata, NobutarouMinotani, TadashiFujiura, KazuoSasaura, MasahiroToyoda, Seiji
    • G01R29/12
    • G01R15/241G01R29/12
    • The present invention relates to an electric field sensor including: a light source (1); an electro optic crystal (7) which is applied with an electric field based on a signal under test, in which a birefringent index changes according to the electric field, and which changes a polarization state of light incident from the light source according to the birefringent index and emits the light; and a detector (9, 17, 19, 21) that detects an electric signal according to the change of the polarization state of the light emitted from the electro optic crystal (7). Further, the electric field sensor includes: a signal electrode (11) for applying the electric field based on the signal under test to the electro optic crystal (7); a counter electrode (12) that forms a pair with the signal electrode (11); and an auxiliary electrode that is electrically connected to the counter electrode (12), and that forms a capacitance with ground.
    • 电场传感器技术领域本发明涉及一种电场传感器,包括:光源(1); 基于被测信号施加电场的电光晶体(7),其中双折射率根据电场而变化,并且根据双折射改变从光源入射的光的偏振状态 指数并发光; 以及根据从电光晶体(7)发射的光的偏振状态的变化来检测电信号的检测器(9,17,19,21)。 此外,电场传感器包括:信号电极(11),用于将基于被测信号的电场施加到电光晶体(7); 与信号电极(11)形成一对的对电极(12); 和与电极(12)电连接的辅助电极,并形成与地电容。
    • 5. 发明公开
    • Wavelength converter
    • Wellenlängenkonverter
    • EP1248143A2
    • 2002-10-09
    • EP02007153.6
    • 2002-03-28
    • Nippon Telegraph and Telephone Corporation
    • Fujiura, KazuoYagi, ShogoImai, TadayukiEnbutsu, KoujiSasaura, MasahiroKurihara, TakashiAbe, MakotoToyoda, SeijiKubota, Eishi
    • G02F1/39G02F1/335G02F1/365
    • G02F1/3534G02F1/3551G02F2001/3548
    • A wavelength converter implements high speed, high efficiency, low noise wavelength conversion without performing high voltage poling of a crystal, and enables switching and modulation of converted light in response to an electric field. A KLTN crystal (4), which is a 0.5 mm thick plate with its surfaces optically polished, includes a deposited-gold electrode within its incidence plane, and is connected to a DC power supply via a copper wire. The crystal material is composed of KTa 1-x Nb x O 3 and/or K 1-y Li y Ta 1-x Nb x O 3 . A fundamental wave generator (1) generates a 1.55 µm fundamental wave in accordance with a differential frequency between an Nd:YAG Q-switched laser and an excimer laser. A polarizer (2) controls the polarization of the fundamental wave in the direction parallel to the electric field, and launches it into the electrode of the KLTN crystal (4). The KLTN crystal (4), rotating on an axis in the direction of the electric field, launches only part of the generated SHG light with the same polarization direction as that of the incident light into a photo multiplier tube (8) through a polarizer (7).
    • 波长转换器实现高速,高效率,低噪声波长转换而不执行晶体的高电压极化,并且能够响应于电场而转换和调制转换的光。 作为其表面光学研磨的0.5mm厚板的KLTN晶体(4)在其入射平面内包括沉积的金电极,并通过铜线连接到直流电源。 晶体材料由KTa1-xNbxO3和/或K1-yLiyTa1-xNbxO3组成。 基波发生器(1)根据Nd:YAG Q开关激光器和准分子激光器之间的差分频率产生1.55μm的基波。 偏振器(2)在平行于电场的方向上控制基波的偏振,并将其发射到KLTN晶体(4)的电极中。 沿着电场方向在轴上旋转的KLTN晶体(4)仅将与入射光相同的偏振方向的所生成的SHG光的一部分通过偏振器(8)发射到光电倍增管(8) 7)。