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Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double pulses



Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double pulses



Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics 65(2 Pt 2): 026403



Femtosecond laser-produced plasmas are bright ultrafast line x-ray sources potentially suitable for different applications including material science and biology. The conversion efficiency of the laser energy incident onto a solid target into the x-ray emission is significantly enhanced when a laser prepulse precedes the main pulse. The details of x-ray line emission from solid targets irradiated by a pair of ultrashort laser pulses are investigated both theoretically and experimentally. Insight into spatial and temporal characteristics of the line x-ray source is provided by numerical simulations and a simplified analytical model. Optimal time separation of the laser pulses is searched for in order to reach the maximum conversion of laser energy into the emission of selected x-ray lines. We deduced how the optimal pulse separation scales with laser and target parameters.

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Accession: 045968771

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PMID: 11863664

DOI: 10.1103/PhysRevE.65.026403


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