Abstract
High harmonic generation (HHG) from solids driven by ultra-short and ultra- intense laser pulses is attracting more and more attention. Arising from the sub-optical-cycle electron motion, this HHG provides a new perspective for studying high-order nonlinear interactions between light and solids on a very short time scale.
Time resolved method is one of the significant tools to investigate the ultrafast electron dynamics. Ultrashort deep ultraviolet (DUV) pulses serve as indispensable tools for investigating electron dynamics on the femtosecond scale. We use the direct method to generate 266 nm ultrafast pulses from two stages of the third harmonic generation of 800 nm pulses.
Intense ultrafast pulses are required to capture the dynamics of light-matter interaction. We used a an all-solid-state nonlinear pulse compression setup, which compressed the 515 nm pulses, around 3.25uJ, from 189 fs to 25fs,using self-phase modulation in few pieces of fused silica plates.
These ultra-short and ultra-intense laser pulses with high pulse energy can be used to investigate the dynamic of electrons by pump-probe experiments. The 800 nm pulses as pump to excite and 2 um pulses as probe to collect the high order harmonics spectrum from the sample hBN, graphene, and TMDs.
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