Investigation of femtosecond optical delay and auto correlator in X-ray region
| Project/Area Number |
23360038
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | The Institute of Physical and Chemical Research |
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Principal Investigator |
TAMASAKU Kenji 独立行政法人理化学研究所, 放射光科学総合研究センター, 専任研究員 (30300883)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥20,670,000 (Direct Cost: ¥15,900,000、Indirect Cost: ¥4,770,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2011: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
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| Keywords | X線自由電子レーザー / 非線形光学 / 内殻２重イオン化 / ２光子吸収 / パルス幅測定 / X線 / Ｘ線 / Ｘ線自由電子レーザー / 2光子吸収 |
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| Research Abstract |
We investigate X-ray auto correlator to determine the duration of femtosecond pulses from X-ray free-electron lasers. We successfully observe double core-hole creation in krypton and direct two-photon absorption in germanium, which are indispensable two-photon processes for the auto correlator. We estimate the pulse duration to be 2.5 fs by analyzing the X-ray fluorescence spectrum from the double core-hole state. We find a competition between K-shell two-photon absorption and L-shell one-photon absorption. We analyze the pulse-energy dependence of two-photon absorption including the competition effect. Finally, we successfully reproduce the observed pulse-energy dependence, and determine the cross section of two-photon absorption. The competition determines the highest intensity for the auto correlator with two-photon absorption.
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Report
(4 results)
Research Products
(19 results)
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[Journal Article] Double Core-Hole Creation by Sequential Attosecond Photoionization2013
Author(s)
K.Tamasaku, M.Nagasono, H.lwayama, E.Shigemasa, Y.Inubushi, T.Tanaka, K.Tono, T.Togashi, T.Sato, T.Katayama, T.Kameshima, T.Hatsui, M.Yabashi, T.Ishikawa
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Journal Title
Phys. Rev. Lett.
Volume: 111
Issue: 4
Pages: 43001-43001
DOI
Related Report
Peer Reviewed
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[Presentation] 非線形光学現象2012
Author(s)
玉作賢治
Organizer
放射光将来光源利用サイエンス若手シンポジウム
Place of Presentation
東京大学
Year and Date
2012-08-18
Related Report
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