Laser-plasma diagnostics near one-quarter of the critical density
Avrov A.I., Bychenkov V.Yu., Krokhin O.N., Pustovalov V.V., Rupasov A.A., Silin V.P., Sklizkov G.V., Tikhonchuk V.T., Shikanov A.S.
Results are presented of experimental measurements of the generation of the harmonic 3ω0/2 in spherical heating of hollow glass microspheres by intense neodymium-laser radiation. It is shown, on the basis of parametric-turbulence theory, that it is possible to determine the electron temperature and the characteristic dimension of the plasma inhomogeneity of the plasma in the region of one-quarter of the critical density from the spectrum and intensity of the 3ω0/2 harmonic.