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====== Femtosecond Coherent Imaging ======


Observation of ultrafast phenomena in atomic- or nano-scale requires ultrafast camera. When an object is illuminated by flash light in a time scale shorter than the object movement time, snap shot images can be recorded without blurring. The flash duration of synchrotron radiation is typically a few ten pico-second, and was not enough fast to observe ultrafast phenomena in atomic- or nano-scale. X-ray free-electron laser realizes much shorter flash duration in femtosecond scale.
 

X-rays has much shorter wavelengths than visible light, and thus enables us to observe much smaller objects such as atoms. Furthermore, x-rays would enables us to observe much faster phenomena than visible light, when x-rays with ultimately short flash duration become available. Together it means that x-rays has great potential to record atomic movie. A time series of coherent x-ray diffraction patterns will unvail structural dynamics deep inside the sample.

<tab>{{:en:research:pump_probe_e_0.png?300|Femtosecond Coherent Imaging}}

<tab>**Fig.　Schematic of Femtosecond Coherent Imaging Using X-ray Free-Electron Laser**

===== References =====


    - **Femtosecond Snapshot Holography with Extended Reference Using Extreme Ultraviolet Free-Electron Laser** \\  __Yoshinori Nishino__, Yoshihito Tanaka, Makoto Okada, Motohiro Okaya, Yoshihito Uozaki, Kimihiko Nozaki, Makina Yabashi, Mitsuru Nagasono, Kensuke Tono, Hiroaki Kimura, Haruhiko Ohashi, Shinji Matsui, Tetsuya Ishikawa, and Eiichiro Matsubara \\  [[http://apex.jsap.jp/link?APEX/3/102701/|Applied Physics Express 3 (2010) 102701]].