[8a-N405-1~11] 3.5 Ultrashort-pulse and high-intensity lasers

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[8a-N405-1] Development of a Soft-X-ray High-Harmonic Spectroscopy Apparatus and Its Application to Thin-Film Transmission Measurements

〇Ryunosuke Takahashi¹, Soudai Sakoda¹, Kaede Yamada¹, Nobuhisa Ishii², Hiroki Wadati^1,3 (1.Univ. of Hyogo, 2.QST KPSI, 3.ILE, Osaka Univ)

Keywords:

HHG,thin film,Ultra-short pulsed laser

We built a spectroscopic setup that generates ultrashort-pulse soft-X-ray high-order harmonics up to the 59th order (~71 eV) by focusing a 1030 nm, 200 fs PHAROS laser into argon gas with an f = 200 mm lens. The resulting EUV radiation was used to record the transmission spectrum of a Si₃N₄ thin film; comparison with theoretical calculations allowed a non-destructive determination of the film thickness. We also present preliminary transmission data for Cr and Mg thin films, underscoring the system’s promise for future materials evaluation and magnetization-dynamics studies.