| 摘要 |
PROBLEM TO BE SOLVED: To improve a conversion efficiency and to attain the high speed of the conversion by providing mirrors while opposing them to both side faces of a liquid crystal cell and passing the light beam of a laser beam or the like through the liquid crystal cell and reflecting it in between respective mirrors in multiple while impressing a voltage on the liquid crystal cell. SOLUTION: Transparent electrodes 1a, 1a are provided in both side faces confronted with each others of a liquid crystal cell 1 by being polymerized directly and mirrors 2, 2 are provided while being opposed to respective electrodes and the light beam of the laser beam or the like is passed through the cell 1 and is reflected in between the two opposed mirrors 2, 2 in multiple while impressing a variable voltage V on the respective transparent electrodes 1a, 1a of the cell 1. In this case, the phase and the polarization of the light beam are largely changed by varrying the voltage V. Then, in using of a multiple reflection liquid crystal cell, the phase and the retardation (relative phase difference between orthogonal polarized components) of the light beam are increased according to reflection times without changing the main axis or polarization of the light beam by arranging the cell so that the main axial plane of the liquid crystal coincide with the incident plane of the light beam. |
