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Abstract
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving mu J/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.
Original language | English |
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Article number | 135004 |
Pages (from-to) | - |
Number of pages | 5 |
Journal | Physical Review Letters |
Volume | 108 |
Issue number | 13 |
DOIs | |
Publication status | Published - 30 Mar 2012 |
Keywords
- x-ray harmonic comb
- harmonic comb
- relativistic electron spikes
- electron spikes
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Dive into the research topics of 'Soft-x-ray harmonic comb from relativistic electron spikes'. Together they form a unique fingerprint.Projects
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KEY PHYSICS FOR INERTIAL CONFINEMENT DIAGNOSED BY ION EMISSION
McKenna, P. (Principal Investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/10/07 → 30/09/11
Project: Research