THE ENHANCEMENT OF OPTICAL 3RD HARMONIC SUSCEPTIBILITY IN A PARABOLIC QUANTUM-WELL BY TRIPLE-RESONANCE

Abstract

The third harmonic susceptibility for the finite parabolic quantum well (PQW) is studied theoretically. An important feature of the finite PQW is that the subband eigenenergies E(n) form an equally spaced energy-level ladder. Since the eigenenergy spacing hBARomega0 can be designed to resonate with the pumping source, the third harmonic susceptibility can be greatly enhanced through the triple resonance' A third harmonic susceptibility as high as 2000 (mm/V)2 could be achieved for the finite parabolic quantum well structure. This is a more than six orders of magnitude enhancement as compared to that of the bulk GaAs.