Switching property of orthogonally polarized pump FWM controlled by applied electric field.

在上一个财政年度，我们成功地证明了光折变四波混频（FWM）输出可以通过外加电场开关。该开关的开关速度比通常的光折变四波混频开关快得多，其中折射率光栅在每次开关时都被重写，但由于我们的光电探测器响应慢，无法测量该速度。在本财政年度，我们尝试测量该速度，发现响应时间比我们的脉冲发生器的响应时间短，其响应时间为10μs量级。然后，我们分析了外加电场对自泵浦相位共轭镜（SPPCM）输出的开关操作，并成功地进行了演示，同时，我们还从理论上分析了外加电场对光折变输出的波长选择和像素选择。结果是有希望的波长选择和像素选择。

In the last fiscal year we demonstrated successfully that the output from photorefractive four wave mixing (FWM) could be switched by externally applied electric field. The switching speed was much faster than usual photorefractive four wave mixing switch in which index grating is rewritten at every switching occasion, but the speed could not be measured because of slow response of our photo detector.In this fiscal year we tried to measure the speed and found that the response time was shorter than that of our pulse generator whose response time was of the order of 10μs. Then, we analyzed switching operation of output from self pumped phase conjugate mirror (SPPCM) by externally applied electric field and successfully demonstrated it.Also, we theoretically analyzed wavelength selection and pixel selection of photorefractive output by externally applied electric field. The results were promising for wavelength selection and for pixel selection.