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    • 1. 发明授权
    • Polarization plane switch and optical switching device using the same
    • 极化平面开关和光开关器件使用相同
    • US5521741A
    • 1996-05-28
    • US427184
    • 1995-04-21
    • Hiromitsu UmezawaYoichi SuzukiTomokazu ImuraTsugio TokumasuHiroshi Rikukawa
    • Hiromitsu UmezawaYoichi SuzukiTomokazu ImuraTsugio TokumasuHiroshi Rikukawa
    • G02F1/09G02F1/03
    • G02F1/093
    • A polarization plane switch comprising a Faraday rotator made of an iron-containing garnet single-crystal film and magnetic field applying devices capable of reversing a magnetic field to be applied to the Faraday rotator. The polarization plane switch has a structure in which magnetization of part of the Faraday rotator is unsaturated and that of the remaining portion of it is saturated when a magnetic field is applied to the Faraday rotator by the magnetic field applying device, and a light beam passes through the magnetically saturated portion almost vertically to the film surface. As the above Faraday rotator, it is the most preferable to use a Faraday rotator made of Bi-substituted iron garnet single crystal formed by liquid-phase epitaxy and having a compensation temperature, and thermally treated under the top condition at a temperature between 1,120.degree. and 1,180.degree. C. for 7 hours or less.
    • 包括由含铁石榴石单晶膜制成的法拉第旋转器的偏振平面开关和能够反转施加到法拉第旋转器的磁场的磁场施加装置。 偏振平面开关具有这样一种结构,其中当通过磁场施加装置向法拉第转子施加磁场时,法拉第转子的一部分的磁化是不饱和的,剩余部分的磁化饱和,并且光束通过 通过磁性饱和部分几乎垂直于膜表面。 作为上述法拉第旋转器,最优选使用由液相外延形成的具有补偿温度的双取代铁石榴石单晶制成的法拉第旋转器,并在顶部条件下在1120℃的温度下进行热处理 和1,180℃下干燥7小时以上。