The second optical harmonic generation in quadratic nonlinear crystal structure is theoretically investigated. The structure consists of regularly modulated inhomogeneous layers that are divided by homogeneous layers of random thickness. The dependence of the process efficiency on the layer number and dispersion of the layer thickness is determined.
$^1$Kirensky Institute of Physics SB RAS. Krasnoyarsk 660036, Russia
$^2$Siberian Federal University. Krasnoyarsk 660041, Russia
$^3$Faculty of Physics and International Laser Center, Lomonosov Moscow State University Moscow 119991, Russia