Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double pulses.
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.
Andreev
A A
AA
Institute for Laser Physics, S.C. Vavilov State Optical Institute, Birzhevaya line 12, 193232 St. Petersburg, Russia.
Limpouch
J
J
Iskakov
A B
AB
Nakano
H
H