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Journal Article

Transient-gain photoionization x-ray laser

MPS-Authors
/persons/resource/persons185052

Weninger,  Clemens
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Center for Free Electron Laser Science, 22607 Hamburg, Germany;
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons145791

Rohringer,  Nina
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Center for Free Electron Laser Science, 22607 Hamburg, Germany;

External Ressource
Fulltext (public)

PhysRevA.90.063828.pdf
(Publisher version), 3MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Weninger, C., & Rohringer, N. (2014). Transient-gain photoionization x-ray laser. Physical Review A, 90(6): 063828. doi:10.1103/PhysRevA.90.063828.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-E290-5
Abstract
We present a generalized theory based on one-dimensional Maxwell-Bloch equations to study the amplification process of an inner-shell photoionization-pumped atomic x-ray laser. Focusing an x-ray free-electron laser beam in an elongated neon-gas target results in a strong exponential amplification of Kα fluorescence, as recently demonstrated [N. Rohringer et al., Nature (London) 481, 488 (2012); C. Weninger et al., Phys. Rev. Lett. 111, 233902 (2013)]. Here, we present an in-depth theoretical study of the amplification process that goes beyond the previous theory based on a rate-equation approach. We study the evolution of the pulse characteristics during the amplification process for transform-limited Gaussian and broadband self-amplified spontaneous-emission pump pulses. We discuss the impact of the gain-dependent group velocity on the emitted x-ray radiation and the resulting gain-guiding effects. A thorough analysis of the spectral and temporal properties of the emitted radiation is presented, including higher-order field-correlation functions, to characterize the ensemble of emitted x-ray pulses.