Research On Automatic Control Technique Of Laser Intensity Based On Liquid Crystal

Liquid crystal is like odd axis crystal in optics. It is a kind of anisotropic matter. Its characters are between solid crystal and the isotropic liquid. It has the following power and viscidity like liquid, and the anisotropy like crystal. It has electrical light effect, magneto optical effect or thermal light effect in outside field. Furthermore, it has birefringence, diffraction and optical rotation like crystal. With the more and more widely uses of the liquid crystal in many fields, it applicative laser communication field also have been paid more attentions by people.The system that we build introduces the method of the characteristic optical rotation method in the design of the light way, through using the modulate character of liquid crystal spatial light modulator, based on the use of single-chip AVR and peripheral circuit design, also the adaptive control about the energy of laser effectively. We have done some concrete work in such aspects as the choosing of the device, design of light way, establishment of the procedures, error analysis, and develop a system of adaptive control, which integrates light, machine, electricity and calculation.