The influence of permanent dipole moments on second harmonic generation in asymmetric semiconductor quantum wells

The influence of permanent dipole moments on intersubband double resonance second harmonic generation in asymmetric quantum wells is analyzed. It is found that in realistic QW´s matched for 10.6 μm pump the permanent dipole moments may have modest to significant influence on the conversion efficiency, especially at higher pump powers. At longer wavelengths, however, their influence increases, and should be taken into account in modeling the device performance. Energy level separation shifting due to electron spatial redistribution along the interaction path (self-consistent method) is shown to influence SHG even at moderate doping concentrations