题 目：非线性光学中的色散冲击波
报告人：A. Kamchatnov教授
主持人：黄国翔教授
时 间：2021年7月26日（周一）下午2:30-3:30
地 点：线上报告（zoom），Room id：93952850591
报告人简介：
A. M. Kamchatnov graduated from Moscow Institute of Physics and Technology in 1971 and got PhD degree in Theoretical physics from the same Institute in 1974. After that he held positions of Researcher and Senior Researcher at Troitsk Institute of Innovative and Thermonuclear Investigations (1975 – 1997). In 1997 he joined Institute of Spectroscopy, Russian Academy of Sciences, Moscow as a Leading Researcher, then Principal Researcher, and now he holds the position of Head of Theoretical Department at the same Institute.
A. M. Kamchatnov has worked in areas of nuclear physics, plasma physics and nonlinear optics. Up to now, he has published one book, several review articles and more than 150 articles.
报告内容简介：
In this talk, I give a brief introduction to physics of dispersive shock waves (DSWs) and to basic principles of Gurevich-Pitaevskii theory of such waves [1]. I show that many important characteristics of DSW, such as speeds of its edges and the amplitude of the leading soliton, can be calculated by an elementary method based on the asymptotic theory of propagation of high-frequency wave packets along a smooth background evolved from an intensive nonlinear pulse [2]. In particular, this method allows one to find the number of solitons produced from an initial pulse for a wide class of evolution equations and initial conditions [3]. It is shown that the theory provides quite accurate description of evolution of nonlinear pulses in experiments on propagation of pulses in nonlinear optical systems [4].
References
1. A. M. Kamchatnov, Gurevich–Pitaevskii problem and its development, Physics–Uspekhi 64 (1) 48–82 (2021).
2. A. M. Kamchatnov, Dispersive shock wave theory for nonintegrable equations, Phys. Rev. E 99, 012203 (2019).
3. A. M. Kamchatnov, Theory of quasi-simple dispersive shock waves and number of solitons evolved from a nonlinear pulse, Chaos 30, 123148 (2020).
4. T. Bienaimé, M. Isoard, Q. Fontaine, A. Bramati, A. M. Kamchatnov, Q. Glorieux, and N. Pavloff, Quantitative analysis of shock wave dynamics in a fluid of light, Phys. Rev. Lett. 126, 183901 (2021).