Asymmetry of the Stokes and anti-Stokes components of the nonlinear response of high-temperature superconductors in the method of picosecond biharmonic pumping

It is shown in the model of the nonlinear response of high-temperature superconductors (HTSCs) caused by interband transitions in the electronic spectrum with a metastable energy gap that the Stokes and anti-Stokes components of the HTSC response to picosecond biharmonic pumping are asymmetric, and for the excitation-pulse frequency detuning exceeding 100 cm^-1, the efficiency of self-diffraction in the directions corresponding to these two components is different.