We analyze experimentally light scattering from χ^(2) nonlinear gratings and observe two
types of second-harmonic frequency-scattering processes. The first process is identified as …

We study the second-harmonic (SH) parametric processes in unpoled crystals of Strontium
Barium Niobate (SBN) with disordered structures of ferroelectric domains. Such crystals …

We observe experimentally a novel type of nonlinear diffraction in the process of two-wave
mixing on a nonlinear quadratic grating. We demonstrate that when the nonlinear grating is …

We investigate systematically the evolution of second harmonic generation in strontium
barium niobate with different degrees of disorder of its χ^ 2 nonlinearity. These different …

We study parametric frequency conversion in quadratic nonlinear media with disordered
ferroelectric domains. We demonstrate that disorder allows realizing broadband third …

Random quasi-phase-matching (RQPM) of the second-harmonic generation process is
investigated experimentally and theoretically in a strongly randomized spontaneously grown …

Radiation in the range 187. 5-215 nm was generated via random quasi-phase-matched
frequency doubling of femtosecond laser pulses in nonlinear photonic crystals of strontium …

We study theoretically and numerically the second harmonic generation in a nonlinear
crystal with random distribution of ferroelectric domains. We show that the specific features …

We report on experimental and theoretical studies of Čerenkov-type second-harmonic
generation in random nonlinear photonic structures with different two-dimensional …

We demonstrate experimentally the generation of second-harmonic conical waves via
parametric frequency doubling in a two-dimensional annular periodically poled nonlinear …