Generatsiya Vysokikh Opticheskikh Garmonik Pri Vzaimodeystvii Femtosekundnykh Lazernykh Impul'sov Srednego IK-diapazona S Poverkhnost'yu Tverdotel'nykh Misheney

We obtained the spectra of high optical harmonics produced by subrelativistic femtosecond pulses on the surface of polystyrene, CaF2, BK7, and Al solid targets. High harmonics of up to the 51st order of radiation with central 3.85 µm wavelength were observed. The highest order harmonics were generated from the polystyrene target surface. The harmonics energy versus their numbers is shown to fit well a decaying power law with the exponent ranging from 4 to 8/3.