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- Title
Intense sub‐micrometre focusing of soft X‐ray free‐electron laser beyond 10<sup>16</sup> W cm<sup>−2</sup> with an ellipsoidal mirror.
- Authors
Motoyama, Hiroto; Owada, Shigeki; Yamaguchi, Gota; Kume, Takehiro; Egawa, Satoru; Tono, Kensuke; Inubushi, Yuichi; Koyama, Takahisa; Yabashi, Makina; Ohashi, Haruhiko; Mimura, Hidekazu
- Abstract
Intense sub‐micrometre focusing of a soft X‐ray free‐electron laser (FEL) was achieved by using an ellipsoidal mirror with a high numerical aperture. A hybrid focusing system in combination with a Kirkpatrick–Baez mirror was applied for compensation of a small spatial acceptance of the ellipsoidal mirror. With this system, the soft X‐ray FEL pulses were focused down to 480 nm × 680 nm with an extremely high intensity of 8.8×1016 W cm−2 at a photon energy of 120 eV, which yielded saturable absorption at the L‐edge of Si (99.8 eV) with a drastic increase of transmittance from 8% to 48%.
- Subjects
FREE electron lasers; SOFT X rays; X-ray lasers; NUMERICAL apertures; MIRRORS; HYBRID systems
- Publication
Journal of Synchrotron Radiation, 2019, Vol 26, Issue 5, p1406
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S1600577519007057