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6月30日学术报告

来源： 发布时间：2017-06-26【字体：大 中 小】

 

  时间：2017年6月30日（周五）上午09:30 

  地点：溢智厅 

 

报告1 题目：Frequency domain Nonlinear Optics & Applications

报告人：Fran?ois Légaré教授

单位：Institut National de la Recherche Scientifique, Centre éMT, 1650 bd Lionel Boulet, Varennes, Qc, J3X1S2, Canada

摘要：Over the recent years, we have introduced the concept of Frequency domain Optical Parametric Amplification (FOPA) [1,2]. Using this approach at the Advanced Laser Light Source (ALLS), we have developed a high energy infrared laser system delivering two-cycle 1.8 micron pulses with up to 30 mJ of energy, corresponding to 2.5 TW peak power (in preparation). This laser system paves the way for high flux water window soft X-ray pulses, high-field THz pulses, and high brightness ultrashort electron bunches. Among various applications of these sources, we are working to combine THz and soft X-ray pulses for probing ultrafast dynamics in solids including femtosecond magnetization dynamics and ultrafast phase transition. Furthermore, we are planning to upscale FOPA to peak power of 10 TW and current laser Ytterbium laser technologies [3] allow to dream making this laser operating at kHz repetition rate for merging high peak and high average power. By combining these technological advances, we are now working to commercialize the FOPA through a recently founded spin-off company few-cycle Inc. While the concept of Frequency domain Nonlinear Optics has been introduced with FOPA, we have recently generalized this approach to other nonlinear optical processes. Recent results on second harmonic generation (under review) will be presented.

　　

报告2 题目：Mechanisms of high-order harmonic generation from solids

报告人：卞学滨研究员

单位：中国科学院武汉物理与数学研究所

摘要：Laser-solid interaction was investigated numerically by simulating the Bloch electron wave-packet dynamics in periodic potentials. We introduce a quasi-classical model in the k space combined with the energy band structure to reveal the mechanisms of high-order harmonic generation (HHG) processes occurring in a sub-cycle timescale. We also propose an efficient way to enhance the yield of HHG in inhomogeneous laser fields below the damage threshold. Nonadiabatic redshifts of HHG in the higher plateaus are predicted.

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