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Required Laser Properties for Efficient High-Order Harmonic Generation from Relativistic Electron Spikes
https://repo.qst.go.jp/records/73306
https://repo.qst.go.jp/records/733065c2980bc-498f-4c30-8cda-bb9babc0865f
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-12-20 | |||||
| タイトル | ||||||
| タイトル | Required Laser Properties for Efficient High-Order Harmonic Generation from Relativistic Electron Spikes | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
ピロジコフ, アレキサンダー
× ピロジコフ, アレキサンダー× Timur, Esirkepov× A., Pikuz T.× Ya., Faenov A.× Ogura, Koichi× Hayashi, Yukio× Kotaki, Hideyuki× N., Ragozin E.× Neely, D.× Kiriyama, Hiromitsu× Kevin, Koga James× Fukuda, Yuuji× Sagisaka, Akito× Nishikino, Masaharu× Imazono, Takashi× Hasegawa, Noboru× Kawachi, Tetsuya× Daido, Hiroyuki× Kato, Yoshiaki× Bulanov, Sergey× Kondo, Kiminori× Kando, Masaki× ピロジコフ アレキサンダー× エシロケポフ ティムル× 小倉 浩一× 林 由紀雄× 小瀧 秀行× 桐山 博光× コーガ ジェームズ× 福田 祐仁× 匂坂 明人× 錦野 将元× 今園 孝志× 長谷川 登× 河内 哲哉× 加藤 義章× ブラノフ セルゲイ× 近藤 公伯× 神門 正城 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We have recently discovered high-order harmonics from relativistic electron spikes [1, 2] produced by multi-terawatt relativistic-irradiance (>10^18 W/cm^2) femtosecond lasers focused onto gas jet targets with typical electron densities ~ a few x10^19 cm^-3. These harmonics represent a new source of bright coherent x-rays. Our experiments with the J KAREN laser [3] demonstrated a strong dependence of the harmonics generation efficiency on the laser pulse energy and quality, in particular on the focal spot shape. \nHere we discuss laser requirements for efficient harmonics generation. In addition to the obvious need for a higher power, the focal spot quality should approach the diffraction limit, so that the Strehl ratio exceeds 0.5. We consider two typical reasons of the spot degradation. First, it is the noise-like high-frequency wavefront distortions. The above stated quality requirement corresponds to the rms wavefront error of much smaller than 100 nm. Second, it is the angular dispersion, which must be kept smaller than a fraction of the diffraction divergence. For typical 100 to 300 mm beam diameters and 50 nm bandwidths, the angular dispersion should not exceed a urad level and the angular chirp should be less than ~10^-2 urad/nm. We show our recent progress in satisfying these requirements with the J-KAREN-P laser. \n[1] A. S. Pirozhkov, et al., "Soft-X-Ray Harmonic Comb from Relativistic Electron Spikes," Phys. Rev. Lett. 108, 135004-5 (2012). \n[2] A S. Pirozhkov, et al., "High order harmonics from relativistic electron spikes," New J. Phys. 16, 093003-30 (2014). \n[3] H. Kiriyama, et al., "High-Contrast, High-Intensity Petawatt-Class Laser and Applications," IEEE J. Sel. Topics Quantum Electron. 21, 1601118-18 (2015). |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | The Optics & Photonics International Congress OPIC-2016, International Conference on High-Energy Density Sciences HEDS-2016 | |||||
| 発表年月日 | ||||||
| 日付 | 2016-05-19 | |||||
| 日付タイプ | Issued | |||||
