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Phys Rev Lett. 2011 Jun 10;106(23):235002. Epub 2011 Jun 6.

Efficiency enhancement for Kα x-ray yields from laser-driven relativistic electrons in solids.

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Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.


High-irradiance short-pulse lasers incident on solid density thin foils provide high-energy, picosecond-duration, and monochromatic K(α) x-ray sources, but with limited conversion efficiency ϵ of laser energy into K(α) x-ray energy. A novel two-stage target concept is proposed that utilizes ultrahigh-contrast laser interactions with primary ultrathin foils in order to efficiently generate and transport in large quantities only the most effective K(α)-producing high-energy electrons into secondary x-ray converter foils. Benchmarked simulations with no free numerical parameters indicate an ϵ enhancement greater than tenfold over conventional single targets may be possible.

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