Abstract
The feasibility of generating high gain inner-shell x-ray lasers photo-ionization pumped by the DESY/XFEL facility is studied. The gain characteristics are analyzed for the two representative schemes of inner-shell x-ray transitions, the self-terminated x-ray lasing (1s)−1 → (2p)−1 (λ = 4.5nm) in carbon (Z = 6) and the quasi-stationary x-ray lasing (2p)−1 → (3s)−1 (λ = 4.1 nm) in calcium (Z = 20). When the third harmonic XFEL pumping pulses of 10 fs at 284 eV and 360 eV with the pumping intensities of 6 × 1014 W/cm2 and 1 × 1017 W/cm2 for C and Ca are available, respectively, a net gain of 120 cm−1 are predicted with quite short durations of 10 fs and 2fs. Our studies show that DESY/XFEL facility is sufficient to generate the high gain photo-ionization pumped Kα radiations in low Z atoms.
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