Presentation Information
[9p-P02-3]Cumulative effect on extreme ultraviolet high harmonics generated by high repetition rate Yb-based amplifier
〇(M1)Hotaka Yamada1,2, Kohei Nagai2, Takuya Okamoto2, Yasushi Shinohara2, Haruki Sanada2, Ikufumi Katayama1, Jun Takeda3, Katsuya Oguri2 (1.Yokohama Natl. Univ., 2.NTT-BRL, 3.Shibaura Inst. of Tech.)
Keywords:
high harmonic generation
In this study, we investigated the repetition-rate dependence of high-harmonic generation (HHG) using a Yb-based regenerative amplifier with a tunable repetition rate from 0.1 to 100 kHz. The harmonic intensity decreased monotonically above 1 kHz and dropped to approximately 57% at 100 kHz compared to that at 40 kHz. This behavior is consistent with previous reports indicating gas heating and rarefaction under high-repetition-rate irradiation, suggesting that the reduced gas density is a contributing factor to the intensity drop. These findings offer important insights for the development of high-brightness HHG sources.