Characteristics of light reflected from a dense ionization wave with a tunable velocity

Details Characteristics of light reflected from a dense ionization wave with a tunable velocity Characteristics of light reflected from a dense ionization wave with a tunable velocity

2009-04-06

arxiv.org/abs/0904.0851v1

Physics

Plasma Physics

Scientific paper

10.1103/PhysRevLett.103.215003

An optically-dense ionization wave (IW) produced by two femtosecond laser pulses focused cylindrically and crossing each other is shown to be an efficient coherent x-ray converter. The resulting velocity of a quasi-plane IW in the vicinity of pulse intersection increases with the angle between the pulses from the group velocity of ionizing pulses to infinity allowing an easy tuning the wavelength of x-rays. The x-ray spectra of a converted, lower frequency coherent light change from the monochromatic to a high order harmonic-like with the duration of ionizing pulses and the intensity of scattered pulses; the spectrum are not symmetrical at Vc.

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