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    Faraday rotation angle varying device
    1.
    发明公开
    Faraday rotation angle varying device 有权
    法拉第Drehwinkel-Änderungsvorrichtung

    公开(公告)号：EP1162494A1

    公开(公告)日：2001-12-12

    申请号：EP00111097.2

    申请日：2000-06-05

    申请人： FDK Corporation

    发明人： Kawai, Hirotaka ,  Umezawa, Hiromitsu

    IPC分类号： G02F1/09 ,  H01F10/24

    CPC分类号： B82Y25/00 ,  G02F1/09 ,  G02F2201/16 ,  H01F10/245 ,  H01F10/3209

    摘要： There is provided a Faraday rotation angle varying device in which external magnetic fields are applied from at lease two directions to a garnet single crystal having a Faraday effect and vary a synthesized magnetic field so that Faraday rotation angle of light which transmits through the garnet single crystal is controlled. The device has a base film of garnet single crystal having a rotation angle varied in accordance with variation of a synthesized magnetic field, and a compensating film of a garnet single crystal having a constant Faraday rotation angle. The base film has a wavelength coefficient sign and the compensating film has a wavelength coefficient sign which is different from that of the base film, so that a wavelength variation component of the Faraday rotation angle of the base film is reduced by the compensating film. For example, a fixed magnetic field parallel to a light direction is applied by permanent magnets 40, 42 and a variable magnetic field is applied by an electromagnet.

    摘要翻译： 提供了一种法拉第旋转角度变化装置，其中从最初的两个方向将外部磁场施加到具有法拉第效应的石榴石单晶，并改变合成磁场，使得通过石榴石单晶透射的光的法拉第旋转角 被控制。 该装置具有根据合成磁场的变化而变化的旋转角度的石榴石单晶基膜和具有恒定法拉第旋转角度的石榴石单晶的补偿膜。 基膜具有波长系数符号，并且补偿膜具有与基膜不同的波长系数符号，从而通过补偿膜减小基膜的法拉第旋转角的波长变化分量。 例如，通过永磁体40,42施加与光方向平行的固定磁场，通过电磁铁施加可变磁场。

    Faraday rotator
    4.
    发明公开
    Faraday rotator 有权
    法拉第旋转

    公开(公告)号：EP0940704A3

    公开(公告)日：2000-06-28

    申请号：EP99301583.3

    申请日：1999-03-03

    申请人： FDK Corporation ,  FUJITSU LIMITED

    发明人： Kawai, Hirotaka ,  Umezawa, Hiromitsu ,  Nakada, Hidenori ,  Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G02F1/09

    CPC分类号： G02F1/09 ,  G02F1/093 ,  G02F2203/21

    摘要： The present invention relates to a Faraday rotator capable of reducing the temperature dependence on a Faraday rotation angle, thereby enhancing the temperature characteristic, particularly, in a service environment in which the magnetization direction is variable, and an optical device using the Faraday rotator. The Faraday rotator includes a Faraday element (33) which rotates the polarization plane of polarized light rays passing through the Faraday element when an external magnetic field is applied to the Faraday element. In this Faraday rotator, assuming that an angle between a magnetization direction of the Faraday element and a light ray direction is taken as α, the amount of the temperature-dependent change in Faraday rotation angle is reduced by applying the external magnetic field in a direction in which a first amount of the change in Faraday rotation angle due to the temperature dependence on the angle a and a second amount of the change in Faraday rotation angle due to the temperature dependence on the Faraday effect satisfy a relationship in which the sign of the first amount is plus or minus, the sign of the second amount is minus or plus, and the absolute value of one of the first and second amounts is less than twice the absolute value of the other amount, more preferably, substantially equal to the absolute value of the other amount.

    Faraday rotator
    5.
    发明公开
    Faraday rotator 有权
    法拉第旋转器

    公开(公告)号：EP0940704A2

    公开(公告)日：1999-09-08

    申请号：EP99301583.3

    申请日：1999-03-03

    申请人： FDK Corporation ,  FUJITSU LIMITED

    发明人： Kawai, Hirotaka ,  Umezawa, Hiromitsu ,  Nakada, Hidenori ,  Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G02F1/09

    CPC分类号： G02F1/09 ,  G02F1/093 ,  G02F2203/21

    摘要： The present invention relates to a Faraday rotator capable of reducing the temperature dependence on a Faraday rotation angle, thereby enhancing the temperature characteristic, particularly, in a service environment in which the magnetization direction is variable, and an optical device using the Faraday rotator. The Faraday rotator includes a Faraday element (33) which rotates the polarization plane of polarized light rays passing through the Faraday element when an external magnetic field is applied to the Faraday element. In this Faraday rotator, assuming that an angle between a magnetization direction of the Faraday element and a light ray direction is taken as α, the amount of the temperature-dependent change in Faraday rotation angle is reduced by applying the external magnetic field in a direction in which a first amount of the change in Faraday rotation angle due to the temperature dependence on the angle a and a second amount of the change in Faraday rotation angle due to the temperature dependence on the Faraday effect satisfy a relationship in which the sign of the first amount is plus or minus, the sign of the second amount is minus or plus, and the absolute value of one of the first and second amounts is less than twice the absolute value of the other amount, more preferably, substantially equal to the absolute value of the other amount.

    摘要翻译： 本发明涉及能够降低与法拉第旋转角度的温度依赖性的法拉第旋转器，从而提高温度特性，特别是在磁化方向可变的使用环境中，以及使用法拉第旋转器的光学装置。 法拉第旋转器包括法拉第元件（33），当外部磁场施加到法拉第元件时，该法拉第元件（33）使穿过法拉第元件的偏振光的偏振面旋转。 在该法拉第旋转器中，假设法拉第元件的磁化方向与光线方向之间的角度为α，则法拉第旋转角度的温度依赖的变化量通过将外部磁场施加在方向 其中由于与角度α的温度依赖性而导致的法拉第旋转角度的第一量的变化和由于对法拉第效应的温度依赖性而产生的法拉第旋转角度的第二量的变化满足下述关系： 第一数量是正负号，第二数量的符号是负数或正数，第一和第二数量之一的绝对值小于其他量的绝对值的两倍，更优选地基本上等于绝对值 其他金额的价值。