[20a-C301-1~9] 3.5 Ultrashort-pulse and high-intensity lasers

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)English Presentation

[20a-C301-4] Enhancement of high harmonic generation in liquid water by resonant excitation in mid-infrared

〇Tianqi Yang¹, Takayuki Kurihara¹, Yangyang Hua¹, Tomoya Mizuno¹, Teruto Kanai¹, Yoshihisa Harada¹, Jiro Itatani¹ (1.ISSP, Univ. Tokyo)

Keywords:

high harmonic generation

We produced high harmonics of liquid water up to 11^th by tightly focusing the MIR beam, and the transition from perturbative to non-perturbative scaling is confirmed. In the MIR-pump HHG-probe experiments, we observe the persistent enhancement of HHG yield by a factor of 3 when the water sample is pre-excited ~2 ps prior to the strong probe pulse. Furthermore, the enhancement ratio is found to match the absorption peak of liquid water. In this talk, we will discuss the possible mechanism linking the resonant excitation and the HHG.