The optimal phase-matching angles for third harmonic generation of low symmetry nonlinear optical crystal La2CaB10O19

The optimal phase-matching angles for third harmonic generation of low symmetry nonlinear optical crystal La2CaB10O19
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低对称性非线性光学晶体La2CaB10O19三次谐波产生的最佳相位匹配角

DOI:
10.1016/j.optmat.2016.10.023
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发表时间:
2016-12
期刊:
影响因子:
3.9
通讯作者:
Jiyang Wang
Jiyang Wang
中科院分区:
材料科学3区
文献类型:
--
作者:
Guochun Zhang;Huaijin Zhang;Yicheng Wu;Jiyang Wang

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用Maker条纹法和相位匹配法测定了La2CaB10O19(LCB)晶体的非线性光学系数符号。与d22相比,用Maker条纹法得到d21和d23的符号分别为负和正,而用相位匹配法发现d14的符号为正。计算了LCB晶体中三倍频(THG)的相位匹配角,并进行了实验验证。首次确定了三倍频与LCB晶体的有效非线性光学系数分布和最佳相位匹配角,其中第一类和第二类晶体的最佳相位匹配角分别为(48.7°,72.5°)和(65.3°,37.5°)。结果表明,LCB是一种性能优良的三倍频非线性光学晶体。
The signs of nonlinear optical (NLO) coefficients of La2CaB10O19(LCB) crystal were determined by Maker fringe method and phase-matching method. Compared withd22, the signs ofd21andd23are found by Maker fringe method to be negative and positive, respectively, and the sign ofd14is found to be positive by phase-matching method. Phase-matching angles for third harmonic generation (THG) in LCB crystal were calculated and verified by experiments. The distribution of effective NLO coefficient (deff) and the optimal phase-matching angles for THG with LCB crystal are determined for the first time, with optimal phase-matching angles of (48.7°, 72.5°) and (65.3°, 37.5°) for type-I and type-II THG, respectively. The results show that LCB is an excellent NLO crystal for THG application.
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