| 简介 |
PROBLEM TO BE SOLVED : To improve the extinction ratio of a magneto-optical light modulator used in a visible light band, and to increase display contrast in a display device. SOLUTION : In the magneto-optical light modulator, a polarizer 10, a magneto-optical crystal 12 and an analyzer 16 are arranged in an optical path so that light advances, in the order; the magneto-optical crystal is composed of a rare-earth iron garnet single crystal; and a magnetization direction of the magneto-optical crystal is controlled by a variable magnetic field application means for applying a variable magnetic field to the magneto-optical crystal for varying the transmission light quantity output from the analyzer. A linear phaser 14 is inserted between the magneto-optical crystal and the analyzer, in a state such that the transmission light quantity from the analyzer is minimized; the linear phaser is set at an angle at which the elliptical ratio of polarized light, after transmitting through the linear phaser, when the linear phaser is rotated in a light incident surface, is minimized; and the analyzer is arranged so that the transmission axis of the analyzer is orthogonal to the major axis of elliptically polarized light which is transmitted through the linear phaser. COPYRIGHT : (C)2010, JPO&INPIT |
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