Soft X-ray harmonic comb from relativistic electron spikes
A. S. Pirozhkov, M. Kando, T. Zh. Esirkepov, P. Gallegos, H. Ahmed, E., N. Ragozin, A. Ya. Faenov, T. A. Pikuz, T. Kawachi, A. Sagisaka, J. K. Koga,, M. Coury, J. Green, P. Foster, C. Brenner, B. Dromey, D. R. Symes, M. Mori,, K. Kawase, T. Kameshima, Y. Fukuda, L. Chen
TL;DR
This paper introduces a novel high-order harmonic generation method in the water window region using relativistic electron spikes formed by intense laser-plasma interactions, supported by experiments and simulations.
Contribution
It reveals a new harmonic generation mechanism involving electron spikes at plasma cavity boundaries, explained by catastrophe theory and validated through simulations.
Findings
Hundreds of harmonic orders resolved
Generation of uJ/sr harmonic pulses
Mechanism confirmed by particle-in-cell simulations
Abstract
We demonstrate a new high-order harmonic generation mechanism reaching the `water window' spectral region in experiments with multi-terawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving uJ/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.
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