Temperature-dependent Sellmeier equations of nonlinear optical crystal Na3La9O3(BO3)8

Temperature-dependent Sellmeier equations of nonlinear optical crystal Na3La9O3(BO3)8
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非线性光学晶体Na3La9O3(BO3)8的温度相关Sellmeier方程

DOI:
10.1016/j.optmat.2014.07.026
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发表时间:
2014-11
期刊:
影响因子:
3.9
通讯作者:
Yicheng Wu
Yicheng Wu
中科院分区:
材料科学3区
文献类型:
--
作者:
Bo Xu;Xinyuan Zhang;Yuxiao Wu;Yicheng Wu

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在23.5 °C ~ 160 °C温度范围内,用最小偏差法精确测量了Na_3La_9O_3(BO_3)_8(NLBO)晶体在0.363-2.325 μm波长范围内的主折射率。导出了热折射率系数随波长变化的表达式,可用于计算不同波长下的主折射率。推导了与温度相关的Sellmeier方程,并利用该方程计算了不同温度下基于NLBO晶体的频率转换器件的相位匹配角。我们发现,随着波长的增加,NLBO晶体的热折射率系数由正值变为负值。此外,还研究了不同温度下三次谐波产生的相位匹配条件。
The principal refractive indices of Na3La9O3(BO3)8(NLBO) crystal in the wavelength range of 0.363–2.325 μm were accurately measured by using the minimum deviation method within the temperature range from 23.5 °C to 160 °C. We derived the expressions of thermal refractive index coefficient as a function of wavelength that could be used to calculate the principal refractive indices at different wavelengths. The temperature-dependent Sellmeier equations were also derived and used to calculate the phase-matching (PM) angles for a frequency conversion device based on NLBO crystal at different temperatures. We found that the thermal refractive index coefficients of NLBO crystal changed from positive to negative values with the increase of wavelength. In addition, the phase matching conditions for third harmonic generation (THG) at different temperatures were also investigated.
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