PLASMA-HEATING NEAR A METAL TARGET BY NAN OSECOND PULSED OF THE FIRST, 2ND, AND 4TH ND-LASERS HARMONICS

Measurements were made of the electron temperature T-e of a laser plas ma formed on the surface of a metal target by the action of nanosecond pulses of wavelengths lambda = 1060, 530, and 265 nm. The laser radia tion intensity was I approximate to 10(9)-10(13) W/cm(2). The electron temperature was determined from the emf of a double charge layer at t he plasma boundary. Within the limits of the scatter of the experiment al results, the plasma temperature was independent of the laser radiat ion wavelength (in the range 1060-265 nm). The dependence of this temp erature on the radiation intensity obeyed approximately T-e alpha I-1/ 3 throughout the investigated range.