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Numerical investigation of the nonlinear spectral broadening aiming at a few-cycle regime for 10 ps level Nd-doped lasers

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Chinese Physics B 2022年第9期31卷 320-325页

作者： Xi-Hang Yang Fen-Xiang Wu Yi Xu Jia-Bing Hu Pei-Le Bai Hai-Dong Chen Xun Chen Yu-Xin Leng Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

We present a cascaded nonlinear spectral broadening scheme for Nd-doped lasers,featuring with long pulse duration and high average *** scheme is based on two multi-pass cells(MPCs)and one multiple-plate supercontinuum generation(MPSG),and the numerical investigation is driven by a home-made Nd-doped fiber laser with 12 ps pulse duration,50 kHz repetition rate and 100 W average *** MPC-based first two stages allow us to broaden the pulse spectrum to 4 nm and 43 nm respectively,and subsequently,the MPSG-based third stage allows us to reach 235 nm spectral *** broadened spectrum can support a Fourier-transfer-limited pulse duration of 9.8 fs,which is shorter than three optical *** the best of our knowledge,it is the first time to demonstrate the possibility of few-cycle pulses generation based on the 10 ps level Nd-doped *** few-cycle and high average power laser sources should be attractive and prospective,benefiting from the characteristics of structure compact,low-cost and flexibility.

关键词： nonlinear spectral broadening picosecond lasers high average power

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Variation of electron density in spectral broadening process in solid thin plates at 400 nm

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Chinese Physics B 2021年第10期30卷 323-327页

作者： Si-Yuan Xu Yi-Tan Gao Xiao-Xian Zhu Kun Zhao Jiang-Feng Zhu Zhi-Yi Wei School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Material Laboratory Dongguan 523808China

The generation of continuous spectrum centered at 400 nm from solid thin plates is demonstrated in this work.A continuum covering 365 nm to 445 nm is obtained when 125-µJ frequency-doubled Ti:sapphire laser pulses are applied to six thin fused silica plates at 1-kHz repetition *** generalized nonlinear Schrodinger equation simplified for forward propagation is solved numerically,the spectral broadening with the experimental parameters is simulated,and good agreement between simulated result and experimental measurement is *** variation of electron density in the thin plate and the advantage of a low electron density in the spectral broadening process are discussed.

关键词： nonlinear spectral broadening time-dependent nonlinear Schrodinger equation self-phase modu-lation electron density

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