Second-harmonic generation in GaAs-based quantum-cascade lasers

摘要

We report second-harmonic (SH) and sum-frequency generation in GaAs-based quantum-cascade lasers. A doping dependence study of the second-order susceptibility in one of the investigated structure is shown. We also demonstrate that grating-coupled surface emission is a highly efficient way to couple out the SH radiation. (c) 2006 Elsevier B.V. All rights reserved.