5 ) optical rectification in a set of doped zn0.95cd0.05te < 110 > crystals show an increasing efficiency of thz beam generation with the increasing crystal resistivity, but the efficiency saturates and descended when the doped crystal resistivity goes beyond 106 o-m teq10单晶，当晶体的电阻率较大时…入0‘q，cmx晶体产生的thz辐射信号逐渐增大。当晶体的电阻率p106qcm时，晶体产生thz辐射的效率达到饱和甚至可能下降。
Our results explain the mechanisms of the composition and doping dependent thz radiation efficiency for the different crystals . experimental results in this thesis are useful for growing eo crystals with high performance, and suggest that more parameters are required for better characterization of this kind of crystals as thz wave emitters . the main results and conclusions are listed as follows : 1 ) experimental measurements with low cd composition zn1-xcdxte < 110 > crystals ( 0 < x < 0.25 ) as thz emitters indicate the optimum composition of x = 0.05 在国际上，我们首次用实验研究了不同组分、不同掺杂的zn_(1-x)cd_xte<110>单晶(x=00.25)对thz辐射的吸收情况和它们产生thz辐射的相位匹配情况，并首次从晶体对thz辐射的吸收和晶体的相位匹配角度解释了这些晶体产生thz辐射效率不同的原因。
Our results explain the mechanisms of the composition and doping dependent thz radiation efficiency for the different crystals . experimental results in this thesis are useful for growing eo crystals with high performance, and suggest that more parameters are required for better characterization of this kind of crystals as thz wave emitters . the main results and conclusions are listed as follows : 1 ) experimental measurements with low cd composition zn1-xcdxte < 110 > crystals ( 0 < x < 0.25 ) as thz emitters indicate the optimum composition of x = 0.05 在国际上，我们首次用实验研究了不同组分、不同掺杂的zn_(1-x)cd_xte<110>单晶(x=00.25)对thz辐射的吸收情况和它们产生thz辐射的相位匹配情况，并首次从晶体对thz辐射的吸收和晶体的相位匹配角度解释了这些晶体产生thz辐射效率不同的原因。
Our results explain the mechanisms of the composition and doping dependent thz radiation efficiency for the different crystals . experimental results in this thesis are useful for growing eo crystals with high performance, and suggest that more parameters are required for better characterization of this kind of crystals as thz wave emitters . the main results and conclusions are listed as follows : 1 ) experimental measurements with low cd composition zn1-xcdxte < 110 > crystals ( 0 < x < 0.25 ) as thz emitters indicate the optimum composition of x = 0.05 在国际上，我们首次用实验研究了不同组分、不同掺杂的zn_(1-x)cd_xte<110>单晶(x=00.25)对thz辐射的吸收情况和它们产生thz辐射的相位匹配情况，并首次从晶体对thz辐射的吸收和晶体的相位匹配角度解释了这些晶体产生thz辐射效率不同的原因。
In this thesis, we study the thz pulse generation efficiency of the < 110 >-oriented zn1-xcdxte crystals with various composition ratios and doping levels, using thz time-domain spectroscopy . it is found that both absorption and phase matching condition play important role . it is the first time to systematically study < 110 >-oriented zn1-xcdxte crystals with various composition ratios and different doping levels using thz time-domain spectroscopy 本论文中，我们利用thz时域光谱系统对不同组分、不同掺杂的zn_(1-x)cd_xte<110>单晶(x=00.25)作为thz辐射材料的性能和光谱响应进行了研究，发现晶体对thz辐射的吸收和晶体的相位匹配是影响晶体产生thz辐射效率的重要因素。
In this thesis, we study the thz pulse generation efficiency of the < 110 >-oriented zn1-xcdxte crystals with various composition ratios and doping levels, using thz time-domain spectroscopy . it is found that both absorption and phase matching condition play important role . it is the first time to systematically study < 110 >-oriented zn1-xcdxte crystals with various composition ratios and different doping levels using thz time-domain spectroscopy 本论文中，我们利用thz时域光谱系统对不同组分、不同掺杂的zn_(1-x)cd_xte<110>单晶(x=00.25)作为thz辐射材料的性能和光谱响应进行了研究，发现晶体对thz辐射的吸收和晶体的相位匹配是影响晶体产生thz辐射效率的重要因素。
In this thesis, we study the thz pulse generation efficiency of the < 110 >-oriented zn1-xcdxte crystals with various composition ratios and doping levels, using thz time-domain spectroscopy . it is found that both absorption and phase matching condition play important role . it is the first time to systematically study < 110 >-oriented zn1-xcdxte crystals with various composition ratios and different doping levels using thz time-domain spectroscopy 本论文中，我们利用thz时域光谱系统对不同组分、不同掺杂的zn_(1-x)cd_xte<110>单晶(x=00.25)作为thz辐射材料的性能和光谱响应进行了研究，发现晶体对thz辐射的吸收和晶体的相位匹配是影响晶体产生thz辐射效率的重要因素。
The experiment results are valuable to the research of infrared lens, laser window, integrated optical device, the device for blue semiconductor laser, optical detector, nonlinear device, optical waveguide, thz emitter and other devices the following is a brief summary of the works conducted in this thesis and the results achieved 实验结果有助于这些材料作为红外透镜、激光窗口、集成光学器件，蓝光半导体激光器件、光探测器件、非线性光学器件、波导调制器件、thz发射器件等的研究。
Therefore, znte crystal has been the most common material for pulsed thz wave sensing and imaging applications . kai liu et al have studied < 110 >-oriented zn1-xcdxte crystals with various composition ratios and different doping levels to find optimal materials " parameters for high performance thz radiation emitters . they explained their experimental results from the points of view of crystal quality and crystal dc resistivity 为了进一步认识znte晶体产生thz辐射的效率与材料特性的关系，刘凯等人研究了不同组分、不同掺杂的zn_(1-x)cd_xte(110)单晶(x=00.4)产生thz辐射的效率，并从晶体的质量和晶体的直流电阻率出发解释了他们的实验结果。
Therefore, znte crystal has been the most common material for pulsed thz wave sensing and imaging applications . kai liu et al have studied < 110 >-oriented zn1-xcdxte crystals with various composition ratios and different doping levels to find optimal materials " parameters for high performance thz radiation emitters . they explained their experimental results from the points of view of crystal quality and crystal dc resistivity 为了进一步认识znte晶体产生thz辐射的效率与材料特性的关系，刘凯等人研究了不同组分、不同掺杂的zn_(1-x)cd_xte(110)单晶(x=00.4)产生thz辐射的效率，并从晶体的质量和晶体的直流电阻率出发解释了他们的实验结果。
