title: Optical features of a LiF crystal soft X-ray imaging detector irradiated by free electron laser pulses.
abstract: Optical features of point defects photoluminescence in LiF crystals, irradiated by soft X-ray pulses of the Free Electron Laser with wavelengths of 17.2 - 61.5 nm, were measured. We found that peak of photoluminescence spectra lies near of 530 nm and are associated with emission of F3+ centers. Our results suggest that redistribution of photoluminescence peak intensity from the red to the green part of the spectra is associated with a shortening of the applied laser pulses down to pico - or femtosecond durations. Dependence of peak intensity of photoluminescence spectra from the soft X-ray irradiation fluence was measured and the absence of quenching phenomena, even at relatively high fluencies was found, which is very important for wide applications of LiF crystal X-ray imaging detectors.
authors.affiliation: Quantum Beam Science Directorate, Japan Atomic Energy Agency, Kizugawa, Kyoto 619-0215, Japan. pikuz.tatiana@jaea.go.jp
authors.forename: Tatiana
authors.initials: T
authors.lastname: Pikuz
authors.forename: Anatoly
authors.initials: A
authors.lastname: Faenov
authors.forename: Yuji
authors.initials: Y
authors.lastname: Fukuda
authors.forename: Masaki
authors.initials: M
authors.lastname: Kando
authors.forename: Paul
authors.initials: P
authors.lastname: Bolton
authors.forename: Alexander
authors.initials: A
authors.lastname: Mitrofanov
authors.forename: Alexander
authors.initials: A
authors.lastname: Vinogradov
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Nagasono
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Ohashi
authors.forename: Makina
authors.initials: M
authors.lastname: Yabashi
authors.forename: Kensuke
authors.initials: K
authors.lastname: Tono
authors.forename: Yashinori
authors.initials: Y
authors.lastname: Senba
authors.forename: Tadashi
authors.initials: T
authors.lastname: Togashi
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Ishikawa