| 摘要 |
<p>Enhanced energy transfers are achieved between optical beams (10, 12) by operating at wavelengths in the near-bandgap region of a photorefractive material, and employing an electrorefractive effect previously proposed only for single beams. An electric field is applied across a photorefractive medium (4) of sufficient intensity to induce an electrorefractive coupling and consequent energy transfer between the beams (10, 12). Gain enhancements are possible by orienting the photorefractive medium (4) to obtain an electro-optic as well as an electrorefractive effect, and by a moving grating technique. The direction of energy transfer between the beams is controlled by the electric field direction, and can be reversed by reversing the field (18). Operation in the infrared region is made possible with semi-insulating materials. Applications include optical switches, amplifiers and phase conjugators.</p> |
