Roy Samudra, Bhadra Shyamal K, Saitoh Kunimasa, Koshiba Masanori, Agrawal Govind P
Graduate School of Information Science & Technology, Hokkaido University, Sapporo 060-0814, Japan.
Opt Express. 2011 May 23;19(11):10443-55. doi: 10.1364/OE.19.010443.
We observe unique dynamics of Raman soliton during supercontinuum process when an input pulse experiences initially normal group-velocity dispersion with a negative dispersion slope. In this situation, the blue components of the spectrum form a Raman soliton that moves faster than the input pulse and eventually decelerates because of Raman-induced frequency downshifting. In the time domain, the soliton trajectory bends and becomes vertical when the Raman shift ceases to occur as the spectrum of Raman soliton approaches the zero dispersion point. Parts of the red components of the pulse spectrum are captured by the Raman soliton through cross-phase modulation and they travel with it. The influence of soliton order, input chirp and dispersion slope on the dynamics of Raman soliton is discussed thoroughly.
当输入脉冲最初经历具有负色散斜率的正常群速度色散时，我们观察到了超连续谱过程中拉曼孤子的独特动力学特性。在这种情况下，光谱的蓝色分量形成一个拉曼孤子，其移动速度比输入脉冲快，并且由于拉曼诱导的频率下移最终减速。在时域中，当拉曼孤子的光谱接近零色散点且拉曼频移停止发生时，孤子轨迹弯曲并变为垂直。脉冲光谱的部分红色分量通过交叉相位调制被拉曼孤子捕获并与之一起传播。我们深入讨论了孤子阶数、输入啁啾和色散斜率对拉曼孤子动力学的影响。
