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For the Development of Femto Second X‐Ray Laser Using Inner‐Shell L 23 M 1 Transition in Ca
Author(s) -
Kim Dong Eon,
Son Sang Hyun,
Kim Jae Hoon,
Tóth Csaba,
Barty Chris P. J.
Publication year - 2001
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200100064
Subject(s) - lasing threshold , undulator , chemistry , laser , atomic physics , photon , brightness , water window , radiation , optics , femto , physics , nuclear physics
Abstract A new physical scheme for femto second X‐ray lasers, where the upper lasing is pumped by X‐ray photons and the lower lasing level is depopulated via a Coster‐Kronig radiationless transition, is analyzed for Ca. The transition wave length is 4.1 nm, which is in side the water window. The peak spectral brightness of the X‐ray laser out put at 4.1 nm is predicted to be as large as 5× 10 25 photons/sec./(mm 2 mrad 2 0.1% band width), which is 4 to 5 orders of magnitude brighter than a typical undulator radiation in the similar spectral region. In addition to the high flux, the expected duration of X‐ray lasing of ∼3 fs. will be useful for the study of fast dynamics in physical and biological sciences.