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thz辐射
    Chirped pulse cross-correlation for THz wave measurement
    啁啾脉冲互相关法探测THz辐射
    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. Efficiency of THz wave generation declines with increasing the ratio of Cd.
    1.对于不同组分的Zn_(1-x)Cd_xTe<110>单晶,当x=0.05时,作为THz辐射产生器件,具有最好的性能,随着Cd组分的增加,晶体产生THz辐射的效率逐渐降低。
    Effective generation of THz wave is a basic issue in experiments evolving THz radiation.
    在THz辐射成像和光谱分析实验中,如何有效地产生和探测THz脉冲具有非常重要的意义。
    Scientists have studied different electro-optic crystals as a THz waves emitter, and they found that the ZnTe crystal is the best for THz wave generation. Therefore, ZnTe crystal has been the most common material for pulsed THz wave sensing and imaging applications.
    国际上,许多科学家对大量电光晶体产生和探测THz辐射进行了研究,发现ZnTe电光晶体作为THz脉冲产生和探测材料,其总体性能优于其他电光晶体,目前在THz辐射实验中应用得最广泛。
    4) The THz resistivity of doped Zn0.95Cd0.05Te<110> crystals changes withdifferent doping following the similar way as the DC resistivity, which results in different THz wave generation efficiency.
    5.对于不同掺杂的 Zflo的Cd*。 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 p>106 Qcm时,晶体产生THZ辐射的效率达到饱和甚至可能下降。
    The temporal waveform of THz pulse is recorded by electro-optical or photoconductive sampling straight in time domain. By fast Fourier transform operation, the information of amplitude and phase of the THz wave are obtained in frequency domain. THz-TDS provides a direct measurement of the THz electric field, and the complex dielectric constant of a sample is directly extracted by Fourier transform.
    THz时域光谱技术是一种鉴于此而发展起来的新型相干测量技术,它是利用电光取样或光电导取样的方法直接记录THz辐射电场的振幅时间波形,经过傅里叶变换后可以得到测量信号振幅和相位的光谱分布,进而获得材料在THz波段的复介电常数,即色散及吸收等信息的。
    It is found that the optimum composition is x=0.05.By measuring the absorption of THz wave and analyzing the phase matching condition in these crystals,it is concluded that the phase matching condition dominates the performance of the crystal as a THz wave emitter.
    发现当Cd的组分x=0.05时,晶体产生THz辐射的效率最好. 通过研究晶体对THz辐射的吸收和实验中晶体的相位匹配条件,我们发现晶体的相位匹配是影响THz辐射产生效率的主要因素.
 

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