ИСТИНА

We present results of the experimental and numerical studies of hot electron generation and high efficient gamma production by the interaction of relativistically intense laser pulses with solids. Special attention was paid to optimization of the target and laser radiation parameters. We used the Ti:Sa laser system (p-pol, 800 nm, 10 Hz, 40 mJ, 45 ± 5 fs and Imax − 5×1018W/cm2, ASE & prepulses <10−8). For some experiments contrast rations at the nanosecond and picosecond time scales were adjusted to achieve the desired phenomena. In other experiments the Nd:YAG laser (1064 or 532 nm, 30-120 mJ, 6 ns, I~ 1012W/cm2) was used to create the controlled long and dense pre-plasma layer. This laser was locked with the Ti:Sa laser system with accuracy better than 1 ns. Different targets were used: metal plates made of Fe, Mo, W, thick polymer films and plates, as well as different structured targets. We also discussed applications of our studies in nuclear physics, microelectronics, and other areas of research.