摘要
We demonstrate the simultaneous temporal contrast improvement and pulse compression of a Yb-doped femtosecond laser via nonlinear elliptical polarization rotation in a solid state multi-pass cell.The temporal contrast is improved to 109,while the pulse is shortened from 181 to 36 fs,corresponding to a compression factor of 5.The output beam features excellent beam quality with M^(2) values of 1.18×1.16.The total efficiency of the contrast enhancement system exceeds 50%.This technique will have wide applications in high temporal contrast ultra-intense femtosecond lasers.
基金
supported by the National Key R&D Program of China(No.2017YFE0123700)
the National Natural Science Foundation of China(Nos.61925507 and 62075227)
the Shanghai Rising-Star Program(No.21QA1410200)
the Youth Innovation Promotion Association CAS(No.2020248).
