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要设计高衍射效率的声光器件,首先就要选择具有高的声光品质因数的材料,从材料的物理特性来考虑,就是要选择折射率高、光弹常数大及声速度低的材料.测量声光材料的光弹常数,迄今为止,报导了三种测量方法,其中狄克逊(R.W.Dixon)方法应用最普遍,但该方法采用光的布喇格衍射,入射角对衍射效率影响大,调节较麻烦,而且要在不同位置测量入射光
To design a high diffraction efficiency of acousto-optical devices, we must first select the material with high acousto-optic quality factor, from the physical properties of the material to consider, is to choose high refractive index, high photoelastic constant and low acoustic velocity materials. To measure the photoelastic constant of acousto-optic materials, so far, three measurement methods have been reported. Among them, the RWDixon method is the most commonly used method. However, this method uses the Bragg diffraction of light, and the incident angle greatly affects the diffraction efficiency , Adjust more trouble, but also to measure the incident light in different locations