Optical properties of lithium thioindate
Optical properties of lithium thioindate
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DOI：
10.1117/12.424624
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发表时间：
2001-05
期刊：
影响因子：
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通讯作者：
J. Mangin;S. Salaun;S. Fossier;P. Strimer;J. Zondy;L. Isaenko;A. Yelisseyev
中科院分区：
文献类型：
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作者：
J. Mangin;S. Salaun;S. Fossier;P. Strimer;J. Zondy;L. Isaenko;A. Yelisseyev
LiInS2 的光学特性表明它是一种有前途的在中红外区域产生相干辐射的材料。在研究此类功能之前，必须精确表征其光学和机械性能，尤其是它们随温度的变化。研究了足够大且适当取向的具有良好光学质量的晶体。我们首先推导了这些样本的透明度范围以及光学声子的频率。我们使用 2.4 - 2.6 微米范围内的纳秒 OPO 作为泵浦源观察到相位匹配的二次谐波产生，并估计 II 型非线性 deff(XY) 的第一个值等于 7.4 pm/V。通过原始干涉测量方法，沿着-20摄氏度至+ 120摄氏度的三个主要偏振方向测定热膨胀系数、热光系数、压电系数和电光系数。已经开发出一种所谓的法布里-珀罗热扫描（FPTS）干涉测量方法来精确测量电光系数。对于 LiInS2，ri3 的值与其压电系数具有相同的数量级，但比众所周知的 KTiOPO4 的电光系数小约一个数量级。
The optical properties of LiInS2 suggested it as a promising material for generation of coherent radiation in the mid-IR region. Before investigating such capabilities its optical and mechanical properties have to be characterized precisely, and especially their evolution with temperature. Sufficiently large and suitably oriented crystals of good optical quality were studied. We first deduced the transparency range of these samples, as well as the frequencies of the optical phonons. We observed a phase- matched second-harmonic generation, using a nanosecond-OPO in the range 2.4 - 2.6 microns as the pump source and estimated a first value of the type-II nonlinearity deff(XY) equals 7.4 pm/V. The thermal expansion, thermo-optic, piezoelectric and electro-optic coefficients were determined along the three principal directions of polarization from -20 degrees Celsius up to + 120 degrees Celsius by means of original interferometric methods. A so-called Fabry-Perot Thermal Scanning (FPTS) interferometric method has been developed to measure accurately the electro-optic coefficients. For LiInS2 the values of ri3 were found to be of the same order of magnitude as its piezoelectric coefficients, but around one order of magnitude smaller than the electro-optic coefficients of the well known KTiOPO4.