| 摘要 |
PURPOSE:To obtain an optical switch capable of brightness modulation by changing an angle of a polarization plane of linearly polarized light to be projected on a polarizing device made of an acoustooptic crystal high in optical anisotropy, and an angle between the polarizing medium and said polarization plane to diffract it. CONSTITUTION:A piezoelectric vibrator 2 made of piezoelectric material, such as LiNbO3, is adhered to a polarizing medium 2 of an acoustooptic crystal, such as TeO2, and voltage is impressed to the vibrator 2 from a high frequency oscillator 3 to generate periodic change 4 of refraction index equal in frequency to ultrasonic waves in a medium 1. Linearly polarized light 5 is slantly cast in this region to generate diffracted light 6. Intensity of the diffracted light is changed by relatively changing an angle of a polarization plane between the light 5 and the polarizing medium 1, thus enabling development of an optical switch capable of modulation of brightness. |
