Rasskazov Gennady, Ryabtsev Anton, Pestov Dmitry, Nie Bai, Lozovoy Vadim V, Dantus Marcos
Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA.
Opt Express. 2013 Jul 29;21(15):17695-700. doi: 10.1364/OE.21.017695.
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.
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。
