A Self-Diffraction Temporal Filter for Contrast Enhancement in Femtosecond Ultra-High Intensity Laser
Xian-Zhi Wang1,2 , Zhao-Hua Wang1,4* , Yuan-Yuan Wang1,2 , Xu Zhang1,2 , Jia-Jun Song1,2 , and Zhi-Yi Wei1,2,3*
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China2 University of Chinese Academy of Sciences, Beijing 100049, China3 Songshan Lake Materials Laboratory, Dongguan 523808, China4 CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
Abstract ：We demonstrated a nonlinear temporal filter based on the self-diffraction (SD) process. Temporal contrast enhancement, angular dispersion and spectrum broadening properties of the SD process are investigated in experiment and simulation. Driven by spectral phase well compensated laser pulses with bandwidth of 28 nm, the filter produced clean pulses with a temporal contrast higher than $10^{10}$ and excellent spatial profile, the spectrum of which was smoothed and broadened to 64 nm. After implementing this filter into a home-made 30 TW Ti:sapphire amplifier, temporal contrast of the amplified pulses was enhanced to $10^{10}$ within the time scale of $-400$ ps.
收稿日期: 2021-03-16
出版日期: 2021-07-05
:
42.60.-v
(Laser optical systems: design and operation)
42.65.-k
(Nonlinear optics)
42.65.Re
(Ultrafast processes; optical pulse generation and pulse compression)
87.57.cj
(Contrast)
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2021, Vol. 38 
