Simple method of measuring laser peak intensity inside femtosecond laser filament in air.
Simple method of measuring laser peak intensity inside femtosecond laser filament in air.
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DOI：
10.1364/oe.20.000299
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发表时间：
2012-01
期刊：
影响因子：
3.8
通讯作者：
Shengqi Xu;Xiaodong Sun;B. Zeng;W. Chu;Jiayu Zhao;Weiwei Liu;Ya Cheng;Zhi‐zhan Xu;S. Chin-S.-C
中科院分区：
文献类型：
--
作者：
Shengqi Xu;Xiaodong Sun;B. Zeng;W. Chu;Jiayu Zhao;Weiwei Liu;Ya Cheng;Zhi‐zhan Xu;S. Chin-S.-C
飞秒激光丝内激光强度的测量是一项具有挑战性的任务。在这项工作中，我们提出了一个简单的方法来表征在空气中的灯丝内的激光峰值强度。它是基于两个氮荧光线，即391 nm和337 nm的信号比测量。由于不同的激发机制，两条荧光线的信号在不同的非线性阶数下随激光强度的增加而增加。推导出了一个由荧光比简单确定激光峰值强度的经验公式。
Measurement of laser intensity inside a femtosecond laser filament is a challenging task. In this work, we suggest a simple way to characterize laser peak intensity inside the filament in air. It is based on the signal ratio measurement of two nitrogen fluorescence lines, namely, 391 nm and 337 nm. Because of distinct excitation mechanisms, the signals of the two fluorescence lines increase with the laser intensity at different orders of nonlinearity. An empirical formula has been deduced according to which laser peak intensity could be simply determined by the fluorescence ratio.