PbWO_4晶体的太赫兹光谱  

Terahertz Spectra of PbWO_4 Crystal

作　　者：孙桂芳[1,2] 王雅丽[3] 钱霞[1,2] 侯碧辉[4] 

机构地区：[1]聊城大学物理科学与信息工程学院,聊城252059 [2]山东省光通信科学与技术重点实验室,聊城252059 [3]中国科学院大学材料科学与光电技术学院,北京100049 [4]北京工业大学应用数理学院,北京100124

出　　处：《人工晶体学报》2015年第1期138-142,共5页Journal of Synthetic Crystals

摘　　要：测量了室温下钨酸铅（PbWO4,PWO）晶体在0.1-3 THz的太赫兹时域光谱。分析表明：在0.2-0.9 THz范围内,晶体的吸收系数小于30 cm^-1,有较好的透射性,在0.4-0.6 THz有一个较弱的泛频共振吸收峰;折射率在2-6之间变化,0.36-0.9 THz是一个明显的反常色散区域;根据光学常数之间的关系,计算得到介电函数曲线,介电函数实部值在4-38之间变化,在0.36 THz处有明显的突变尖峰;介电函数虚部随频率升高从0.7下降到0.3。Terahertz time-domain spectrum of PbWO4（PWO） crystal in the frequency range from 0. 1 THz to 3 THz was measured at the room temperature. The results show that the absorption coefficient is less than 30 cm^- 1as the frequency changed from 0. 2 THz to 0. 9 THz,indicating that the PWO crystal has a high transmission characteristic. A little overtone resonance is observed in the frequency range from 0. 4THz to 0. 6 THz. The values of the refractive index are 2 to 6,and the refractive index exhibits anomalous dispersion in the frequency range from 0. 36 THz to 0. 9 THz. According to the relation of optical constants,dielectric function curve was obtained. The real part values of dielectric function is 4 to38,and there is an obvious resonance peak in the real part of dielectric function curve in 0. 36 THz. The imaginary part of dielectric function declines from 0. 7 to 0. 3 with frequency increasing.

关 键 词：太赫兹时域光谱 钨酸铅晶体 折射率 介电函数 

分 类 号：O433.4[机械工程—光学工程]