CONSTRUCTION OF PHASE CONJUGATE MICROSCOPE WITH LOW POWER LASER

利用光折变BaTiO_3、Fe掺杂KNbO_3或Bi12SiO_20晶体中的混频过程，利用相位共轭的波前恢复特性，构造了一种新型的显微镜。显微镜只能检测到移动的物体，不需要用计算机进行任何图像处理。1992年，利用我们研制的移动光栅技术，对这些光折变晶体的光折变特性以及它们的位相共轭发射特性进行了精确的测量。同时，我们编制了一个新的计算机程序，模拟了位相共轭波的行为。这些结果与实验测定的光折变特性相结合，为位相共轭显微镜提供了合适的条件。1993年，我们在1992年结果的基础上建立了位相共轭显微镜。作为位相物体，我们制作了全息位相板，并测定了运动位相板的可见度随速度的变化。成功地确定了运动物体的最小速度。该显微镜可用功率为1.6 mW的极低功率激光工作。

We constructed a new type of microscope which utilizes the wave-front recover nature of the phase conjugation, by using wave-mixing processes inside photorefractive BaTiO3, Fe doped KNbO3 or Bi12SiO20 crystals. By the microscope, only moving objects can be detected and any image processing with a computer is unnecessary. So real time observation of the moving objects can be achieved.In 1992, the photorefractive characteristic of these photorefractive crystals as well as the emission characteristics of the phase conjugation from these crystals were precisely examined by using the moving grating technique which we have developed. Simultaneously we made a new computer program which simulates the behavior of the phase conjugate wave. The results combined with experimentally determined photorefractive characteristics provided with the appropriate conditions for the phase conjugate microscope.In 1993, we constructed the phase conjugate microscope based on the results obtained in 1992. As an phase object, we made a hologram phase plate and determined the visibility of the moving phase plate as a function of the velocity. The mimimum velocity of the moving object was successfully determined. The microscope can be operated with quite low power laser with 1.6mW.