MAGNETO-OPTICAL LIGHT MODULATOR

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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