学术报告通知

报告题目：Carrier-Envelope-Phase Characterization for an Isolated Attosecond

         Pulse by Angular Streaking

报告人：上海交通大学物理与天文系 何峰研究员

报告时间：2016年12月28日14：00

报告地点：10号楼126

报告摘要：The carrier envelope phase (CEP) is a crucial parameter for a few-cycle laser pulse since it substantially determines the laser waveform. Stepping forward from infrared to extreme ultraviolet (EUV) pulses, we propose a strategy to directly characterize the CEP of an isolated attosecond pulse (IAP) by numerically simulating the tunneling ionization of a hydrogen atom in a combined IAP and phase-stabilized circularly polarized IR laser pulse. The fine modulations of the combined laser fields, due to the variation of the CEP of the IAP, are exponentially enlarged onto the distinct time-dependent tunneling ionization rate. Electrons released at different time with distinct tunneling ionization rates are angularly streaked to different directions. By measuring the resulting photoelectron momentum distribution, the CEP of the IAP can be retrieved. The characterization of the CEP of an IAP will open the possibility of capturing sub-EUV-cycle dynamics.

报告人：何峰，2005年在中科院上海光机所获得博士学位后，先后在德国马普复杂物理系统研究所、美国堪萨斯州立大学从事博士后研究。2010年加入上海交通大学物理与天文系任特别研究员，主要从事超快激光物理的理论和数值模拟研究。近三年以通讯作者在Phys.Rev.Lett.， Phys.Rev.A等其他国际一流学术期刊发表论文20余篇。2013年获得国家自然科学基金优秀青年基金的资助。