フェムト秒光パルス励起衝撃波波面からのテラヘルツ波放射

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2023/10/02

タイトル(英語): Terahertz Radiation from Shockwave Front Irradiated with Femtosecond Optical Pulses

著者名: 長島　健（摂南大学理工学部），?　心慧（中央研究院應用科學研究中心），畑中　耕治（中央研究院應用科學研究中心）

著者名(英語): Takeshi Nagashima (Faculty of Science and Engineering, Setsunan University), Hsinhui Huang (Research Center for Applied Sciences, Academia Sinica), Koji Hatanaka (Research Center for Applied Sciences, Academia Sinica)

キーワード: テラヘルツパルス，プラズマ，衝撃波，ダブルパルス照射　　terahertz pulse，plasma，shockwave，double pulse irradiation

要約(英語): Femtosecond double optical pulse experiments with nanosecond time delay were conducted in air. Terahertz pulses were generated from laser plasmas produced by the irradiation with the main pulses on shockwave excited by the pre-pulse illumination. Intensity of the terahertz pulses depends on the time difference Δt and relative position Δy between the pre- and main pulses. We found a characteristic dependence of the intensity of the terahertz pulses on Δy at a longer time delay, Δt=14.7 ns, which has two maxima while only one maximum was observed when delay times were at and shorter than 9.7 ns. The results are discussed taking into account air density distribution of the shockwave. The terahertz emission spectroscopy shown here can be a useful technique for investigating density structure and its time variation of shockwave with high temporal resolution.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.143 No.10 （2023） 特集：未来社会に向けた先端光応用・視覚技術II

本誌掲載ページ: 308-313 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/143/10/143_308/_article/-char/ja/