Time-resolved infrared and Terahertz spectroscopy of semiconductor quantum structures

This talk summarizes our activities in nonlinear laser spectroscopy using the free-electron laser at FZD and tabletop lasers. Our research concentrates on III-V semiconductor quantum wells and superlattices. In particular, I will focus on pump-probe spectroscopy, two-photon absorption, and photocurrent autocorrelation involving intersubband transitions in quantum wells at mid-infrared wavelengths, and discuss a concept for scalable photoconductive Terahertz emitters.