Attosecond gamma-ray pulses and angle-resolved-stochastic photon emission in the quantum-radiation-dominated regime

主 讲 人 ：栗建兴    

活动时间 ：03月03日08时30分    

地    点 ：理科楼群2号楼A302

讲座内容：

The feasibility of generation of bright ultrashort gamma-ray pulses is demonstrated in the interaction of a relativistic electron bunch with a counterpropagating tightly-focused superstrong laser beam in the radiation dominated regime. We demonstrate the feasibility of ultrashort gamma-ray bursts of hundreds of attoseconds and of dozens of megaelectronvolt photon energies in the near-backwards direction of the initial electron motion. The tightly focused laser field structure and radiation reaction are shown to be responsible for such short gamma-ray bursts which are independent of the durations of the electron bunch and of the laser pulse. Moreover, signatures of stochastic effects in the radiation of a relativistic electron beam interacting with a counterpropagating superstrong short focused laser pulse are investigated in a quantum regime when the electron’s radiation dominates its dynamics. We consider the electron-laser interaction at near-reflection conditions when pronounced high-energy gamma-ray bursts arise in the backward-emission direction with respect to the initial motion of the electrons. The quantum stochastic nature of the gamma-photon emission is exhibited in the angular distributions of the radiation and explained in an intuitive picture. Although, the visibility of the stochasticity signatures depends on the laser and electron beam parameters, the signatures are of a qualitative nature and robust. The stochasticity, a fundamental quantum property of photon emission, should thus be measurable rather straightforwardly with laser technology available in near future.

主讲人介绍：

栗建兴，2002年至2006年本科就读于伟德BETVLCTOR网页版，2006年至2011年研究生就读于南开大学并获得博士学位，目前是德国马普核物理所资深博士后。主要研究领域：超强激光脉冲与物质相互作用、激光等离子体加速等等。目前以第一作者或通讯作者在 Phys. Rev. Lett., Phys. Rev. A, Appl. Phys. Lett., Opt. Lett. 等相关学术杂志发表论文十余篇，2次在相关国际学术会议做邀请报告。