ИСТИНА

The experimental results on the relativistic laser-plasma interactions of femtosecond laser pulse with bulk targets and contrast control by controlled nanosecond prepulse and with nanoscale structured targets are presented. In our experiments we used a ultrafast pulse of Ti:Sa laser system (pulse duration - 50 fs, energy on target - up to 30 mJ, wavelength - 800 nm, repetition rate - 10 Hz, peak intensity - up to 5 × 1018 W/cm2 ). The controlled prepulse was created by Nd:YAG laser with active Q-switching, a wavelength of 532 nm. (second harmonic - 1064 nm.), pulse duration - 6 ns., pulse energy - up to 250 mJ at the main harmonic. Ions were registered with the use time-of-flight magnet spectrometer with the charge-to-mass (Z/M) separation and Thomson parabola mass spectrometer. Development time-of-flight magnet spectrometer and Thomson parabola massspectrometer and experiments with contrast control by prepulse was supported by Russian Scientific Foundation grants No 18-32-00416 and 19-020-00104. Experiments with volume nanostructured was supported by Russian Science Foundation grant No 17-12-01283. Experiments with surface nanostructured targets was supported by Russian Science Foundation grant No 18-79-10160.