Demonstration of laser induced x-ray radiation in an expanding laser produced plasma

X-ray emission at 10 nm stimulated by visible laser radiation at 614.2 nm in a beryllium laser produced plasma was investigated. A method of laser induced quenching of metastable ions was applied to the He-like Be²⁺ ions in the 1s2s¹S₀ state. Laser excitation to the 1s2p¹P₁ was followed by an intense x-ray emission at a resonance 1s^{2 1}S₀-1s2p¹P₁ transition. Time, angular, and polarization characteristics of the radiation were studied and a linear polarization and a dipole type angular distribution have been found. The total energy radiated in a 1.5 ns pulse amounted to 10 μJ