1. A compact X-ray free-electron laser emitting in the sub-ångström region.
- Author
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Ishikawa, Tetsuya, Aoyagi, Hideki, Asaka, Takao, Asano, Yoshihiro, Azumi, Noriyoshi, Bizen, Teruhiko, Ego, Hiroyasu, Fukami, Kenji, Fukui, Toru, Furukawa, Yukito, Goto, Shunji, Hanaki, Hirofumi, Hara, Toru, Hasegawa, Teruaki, Hatsui, Takaki, Higashiya, Atsushi, Hirono, Toko, Hosoda, Naoyasu, Ishii, Miho, and Inagaki, Takahiro
- Subjects
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FREE electron lasers , *WAVELENGTHS , *ULTRAVIOLET radiation , *LIGHT sources , *GRENZ rays , *LASER beams - Abstract
The free-electron laser, first proposed by Madey in 1971, has significantly reduced laser wavelengths to the vacuum ultraviolet and soft X-ray regions. Recently, an X-ray free-electron laser (XFEL) was operated at 1.2 Å at the Linac Coherent Light Source (LCLS). Here, we report the successful generation of sub-ångström laser light using a compact XFEL source, combining a short-period undulator with an 8 GeV electron beam. The shortest wavelength attained-0.634 Å (63.4 pm)-is four orders of magnitude smaller than the 694 nm generated by Maiman's first laser. The maximum power exceeded 10 GW with a pulse duration of 10?14 s. This achievement will contribute to the widespread use of XFEL sources and provide broad opportunities for exploring new fields in science. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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