摘要
High-order harmonic generation(HHG)is currently utilized for developing compact table-top radiation sources to provide highly coherent extreme ultraviolet(XUV)and soft X-ray pulses;however,the low repetition rate of fundamental lasers,which is typically in the multi-kHz range,restricts the area of application for such HHG-based radiation sources.Here,we demonstrate a novel method for realizing a MHz-repetition-rate coherent XUV light source by utilizing intracavity HHG in a mode-locked oscillator with an Yb:YAG thin disk laser medium and a 100-m-long ring cavity.We have successfully implemented HHG by introducing two different rare gases into two separate foci and picking up each HH beam.Owing to the two different HH beams generated from one cavity,this XUV light source will open a new route to performing a time-resolved measurement with an XUV-pump and XUV-probe scheme at a MHzrepetition rate with a femtosecond resolution.
基金
the support from the special postdoctoral researcher program of RIKEN
the financial support from Grants-in-Aid for Scientific Research Nos.26247068,26220606,and 19H05628
supported by the Photon Frontier Network Program
the Special Coordination Funds for Promoting Science and Technology
the Center of Innovation Science program of the Ministry of Education,Culture,Sports,Science and Technology.
