摘要
Temporal contrast directly affects the interaction between ultraintense and ultrashort pulse lasers with matter.Seed laser sources with broad bandwidth and high temporal contrast are significant for overall temporal contrast enhancement.The technique of cascaded nonlinear processes with optical parametric amplification and second-harmonic generation is demonstrated for high temporal contrast seed source generation.Within 40 ps before the main pulse,the temporal contrast reaches over 10^(11).The pulse energy and duration of the high-contrast pulse are 112μJ and 70 fs,respectively.Considering its high beam quality and stability,this laser source can serve as a high-quality seed for Nd:glass-based ultraintense and ultrashort pulse laser facilities.
基金
supported by the National Key R&D Program of China(2017YFE0123700)
the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB1603)
the National Natural Science Foundation of China(61925507,62075227,12004402)
the Program of Shanghai Academic/Technology Research Leader(18XD1404200)
the Shanghai Municipal Science and Technology Major Project(2017SHZDZX02)
the Youth Innovation Promotion Association CAS(2020248)
the Shanghai Sailing Program(20YF1455000)
the Shanghai Rising-Star Program(21QA1410200)
