Effect of intense laser field on the nonlinear optical susceptibilities in an asymmetric single quantum well

• The effect of a THz laser source ion an asymmetric quantum well is calculated.
• The effective well width increases with increasing laser dressing parameter.
• The Fourier series method is adopted for calculating energies, wave functions and linewidths.
• The nonlinear susceptibilities such as optical rectification and second harmonic generation have been studied.
• The susceptibilities are found to get enhanced when the laser dressing parameter increases.

In the present paper, the effect of a high-frequency laser field on a single asymmetric rectangular quantum well is studied in the Fourier series method. The effect of laser field on the confining potential of the quantum well is taken through the laser dressing parameter which depends upon the strength of intensity and the magnitude of frequency of the laser field. The step type confining potential of the rectangular asymmetric well is modified by the laser dressing parameter to a smooth function. In this quantum well, linear, third-order nonlinear, nonlinear optical rectification and second harmonic generation susceptibilities under another laser source with low frequency are calculated using the density matrix method. The linewidths for susceptibilities are estimated taking the electron scattering with the longitudinal optic phonon. Compared to laser undressed well, the nonlinear optical properties in the laser dressed well are blue shifted and enhanced due to larger energy separations and oscillator strengths, respectively.