Measurement of nonlinear refractive index coefficient using emission spectrum of filament induced by gigawatt-femtosecond pulse in BK7 glass
Measurement of nonlinear refractive index coefficient using emission spectrum of filament induced by gigawatt-femtosecond pulse in BK7 glass
复制标题
利用千兆瓦飞秒脉冲引起的 BK7 玻璃灯丝发射光谱测量非线性折射率系数
DOI：
10.1364/ao.51.002045
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发表时间：
2012-04-20
期刊：
影响因子：
1.9
通讯作者：
Hu, Bitao
中科院分区：
文献类型：
--
作者：
Lu, Xing;Liu, Qingcao;Hu, Bitao
利用峰值功率为15 ~ 40gw的33 fs激光脉冲，探索了一种测定光学玻璃非线性折射率系数的简便方法。在如此极端的超短强激光脉冲下研究光学玻璃的非线性是非常罕见的。根据我们的方法，测量非线性折射率系数只需要一束光和几个实验设备。计算结果与其他方法基本一致，证明了该方法的有效性，且非线性折射率系数与测量技术无关。同时，根据我们和其他人在不同激光功率范围内的结果，非线性折射率系数对激光峰值功率的依赖性较弱。(C) 2012美国光学学会OCIS代码：190.0190,190.3270,120.4530,260.5950。
A beam of 33 fs laser pulse with peak power of 15-40GW was employed to explore a convenient method to determine the nonlinear refractive index coefficient of an optical glass. It is rare to investigate nonlinearities of optical glass with such an extreme ultrashort and powerful laser pulse. According to our method, only a single beam and a few experimental apparatuses are necessary to measure the nonlinear refractive index coefficient. The results from our method are in reasonable agreement with the others, which demonstrates that this new method works well, and the nonlinear refractive index coefficient is independent of measuring technology. Meanwhile, according to our results and those obtained by others in different laser power ranges, it seems that the nonlinear refractive index coefficient has a weak dependence on the laser peak power. (C) 2012 Optical Society of America OCIS codes: 190.0190, 190.3270, 120.4530, 260.5950.