DOUBLY RESONANT 2ND-HARMONIC GENERATION IN QUANTUM-WELLS WITH ANISOTROPIC AND TILTED VALLEYS - RESONANT SCREENING EFFECTS

Second-harmonic generation due to intersubband transitions in near-dou bly resonant systems with anisotropic and tilted valleys is discussed theoretically. Calculations are performed for the L-valley quantum wel l structures employing the perturbative density-matrix formulation wit hin the self-consistent field approximation. The results obtained show that modification of the second-harmonic generation spectrum induced by the depolarization effect depends strongly on the polarization of t he pumped and generated light. (C) 1997 American Institute of Physics.