Third harmonic beam profile generated in atmospheric air using femtosecond laser pulses
Third harmonic beam profile generated in atmospheric air using femtosecond laser pulses
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DOI：
10.1016/j.optcom.2004.10.020
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发表时间：
2005-01-17
影响因子：
2.4
通讯作者：
Chin, SL
中科院分区：
文献类型：
--
作者：
Théberge, F;Aközbek, N;Chin, SL
我们从实验和理论上展示了强大的飞秒激光脉冲成丝过程中空气中三次谐波产生的结果。三次谐波光束图案在较低泵浦能量下在传播轴上显示出一个中心点，然后在较高泵浦能量下被明亮的三次谐波锥形发射包围。我们认为，自聚焦和空气中等离子体生成的联合作用对于沿灯丝的轴上和离轴相位匹配条件发挥着重要作用，从而实现高转换效率。实验结果与数值模拟具有良好的定性一致性。 (C) 2004 Elsevier B.V. 保留所有权利。
We present, both experimentally and theoretically, the results on third harmonic generation in air during the filamentation of a powerful femtosecond laser pulse. The third harmonic beam pattern shows a central spot on the propagation axis at lower pump energy and is then surrounded by bright third harmonic conical emission at higher pump energy. We argue that the combined action of self-focusing and plasma generation in air plays an important role for the on-axis and off-axis phase-matching conditions along the filament resulting in high conversion efficiency. The experimental results are in good qualitative agreement with numerical simulations. (C) 2004 Elsevier B.V. All rights reserved.