Search

Your search keyword '"Kume, Takehiro"' showing total 3 results
Start Over Author "Kume, Takehiro" Journal journal of synchrotron radiation
3 results on '"Kume, Takehiro"'

2. Intense sub‐micrometre focusing of soft X‐ray free‐electron laser beyond 1016 W cm−2 with an ellipsoidal mirror.

Author

Motoyama, Hiroto, Owada, Shigeki, Yamaguchi, Gota, Kume, Takehiro, Egawa, Satoru, Tono, Kensuke, Inubushi, Yuichi, Koyama, Takahisa, Yabashi, Makina, Ohashi, Haruhiko, and Mimura, Hidekazu

Subjects
FREE electron lasers, SOFT X rays, X-ray lasers, NUMERICAL apertures, MIRRORS, HYBRID systems
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%. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

3. Intense sub-micrometre focusing of soft X-ray free-electron laser beyond 10 16 W cm -2 with an ellipsoidal mirror.

Author

Motoyama H, Owada S, Yamaguchi G, Kume T, Egawa S, Tono K, Inubushi Y, Koyama T, Yabashi M, Ohashi H, and Mimura H

Subjects
Calibration, Electrons, Equipment Design, Lasers, Optics and Photonics instrumentation
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 8.8×10 16  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%.

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results