熔融石英中异常的激光诱导群速度色散。

Anomalous laser-induced group velocity dispersion in fused silica.

作者信息

Rasskazov Gennady, Ryabtsev Anton, Pestov Dmitry, Nie Bai, Lozovoy Vadim V, Dantus Marcos

机构信息

Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA.

出版信息

Opt Express. 2013 Jul 29;21(15):17695-700. doi: 10.1364/OE.21.017695.

DOI:10.1364/OE.21.017695

PMID:23938642

Abstract

We present 20fs(2) accuracy laser-induced group velocity dispersion (LI-GVD) measurements, resulting from propagation of a femtosecond laser pulse in 1mm of fused silica, as a function of peak intensity. For a 5.5 × 10(11) W/cm(2) peak intensity, LI-GVD values are found to vary from -3 to + 15 times the material GVD. Normal induced dispersion can be explained by the Kerr effect, but anomalous LI-GVD, found when the input pulses have negative pre-chirp, cannot. These findings have significant implications regarding self-compression and the design of femtosecond lasers.

摘要

我们展示了20飞秒（2）精度的激光诱导群速度色散（LI-GVD）测量结果，该结果是飞秒激光脉冲在1毫米熔融石英中传播时，作为峰值强度的函数。对于5.5×10（11）瓦/平方厘米的峰值强度，发现LI-GVD值在材料GVD的-3到+15倍之间变化。正常的诱导色散可以用克尔效应来解释，但当输入脉冲具有负预啁啾时发现的反常LI-GVD则不能。这些发现对于自压缩和飞秒激光器的设计具有重要意义。