POLARON EFFECTS ON THE OPTICAL 2ND-HARMONIC GENERATION IN A QUANTUM-WELL WITHIN AN ELECTRIC-FIELD

Theoretical predictions of polaron effects on the second-harmonic gene ration due to a resonant intersubband transition in a quantum well wit hin an electric field are presented. The asymmetry of the quantum well due to the electric field accounts for the nonvanishing of the second -order susceptibilities. It is shown that the second-harmonic generati on of our model is over 10 times larger than that of the model where t he electron-LO-phonon interaction is ignored. It is also found that th e optical second-harmonic generation in a quantum well with an applied electric held increases with strengthening electric field, but decrea ses with increasing well width. It is interesting that the wider the q uantum well becomes, the less influence the electric field has on the optical second-harmonic generation. Copyright (C) 1996 Elsevier Scienc e Ltd