| The phase modulation characteristics of Liquid Crystal Spatial Light Modulator (LC-SLM) and its applications are investigated in this thesis. The phase modulation characteristics are analyzed by both theory and experiment. Based on the experimental results, the LC-SLM is simulated to use in optical system for focus adjusting in ZEMAX.The characteristics of the liquid crystal and all kinds of electro-optic effects are analyzed in detail. Different polarization states of incident throughout the liquid crystal are calculated by the way of Jones Matrix. Based on the nematic phase liquid crystal elastic continuum theory, the liquid crystal director distribution under different voltages is calculated by the method of difference iterative. According to the result of the director distribution, the formulas for electronically controlled birefringence effective refractive index and phase modulation are given.Based on the double slit interference method, we set up an experiment system for measuring the phase modulation with the LC-SLM LC2002 which is produced by the company HOLOEYE in Germany. Corresponding software which can distinguish interference stripe automatically is designed. The advantage of this software is that it can not only control the LC-SLM in the experiment but also collect and deal with data, showing the relationship between the phase modulation and the LC-SLM's grey level with graph. The relation between effective refractive index and grey level is deduced. By changing the polarization of the incident, the phase modulation for different polarization is obtained.Optical systems' foci may change affected by the external environment. In order to solve this problem, LC-SLM used in the optical system for focus adjusting and stabilization is proposed. We simulated the liquid crystal lens after a doublet combination lens in ZEMAX. The factors which decide the focus of the system are investigated by changing the depth of the LC lens and the refractive index distribution. |
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