KTP和KTA晶体在3~6THz波段的折射率测量  

Refractive index measurement of KTP and KTA crystals at 3-6 THz band

作　　者：丛振华[1] 刘兆军[1] 秦增光[1] 王伟涛[1] 唐关琦 付强[1] 张行愚[1] 

机构地区：[1]山东大学信息科学与工程学院山东省激光技术与应用重点实验室,山东济南250100

出　　处：《光电子．激光》2015年第6期1106-1110,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(11174185;11204160);山东大学基本科研业务费专项(2015JC041)资助项目

摘　　要：利用太赫兹（THz）光参量发生器,测量了KTP晶体和KTA晶体在3-6THz波段的折射率。利用一束脉冲宽为5ns的Nd：YAG 1 064nm激光作为泵浦源,分别泵浦KTP晶体和KTA晶体,获得了一束宽谱的Stokes光;测量了泵浦光和产生的Stokes光的非共线相位匹配角度以及对应Stokes光的波长,通过计算得出了KTP晶体在3.07-6.12THz波段对应的折射率为2.81-5.05;KTA晶体在3.71-6.19THz波段对应的折射率为3.26-4.68。KTiOPO4 （KTP） and KTiOAsO4 （KTA） crystals are new media to generate terahertz （THz） waves. In this paper,a method for measuring the refractive index of KTP and KTA crystals at 3-6 THz is demonstrated. The Stokes light with wide spectrum was obtained, using an Nd：YAG 1064 nm laser as pump source and a KTP （KTA） crystal as the nonlinear medium in the terahertz-wave parametric generation. The 1064 nm laser has a pulse width of 5 ns and a pulse repetition rate of 1 Hz. The crystals with dimensions of 5 mm× 5 mm× 20 mm are cut at an x axis. Using a collimator,the diameter of 1 064 nm laser is converted to 1.5 mm. The Stokes wavelengths and the corresponding angle between pump and Stokes waves are measured. The refractive index of KTP crystal is calculated to be 2.81-5.05 at 3.07-6.12 THz,and the refractive index of KTA crystal is calculated to be 3. 2644.68 at 3.71-6.19 THz.

关 键 词：THZ辐射 KTP晶体 KTA晶体 THz波参量发生器 

分 类 号：TN248.1[电子电信—物理电子学]