Abstract
High-power lasers in the FIR allow nonlinearity studies of a range of fundamental solid-state excitations. Some of these excitations, e.g. lattice vibrations or ballistic carrier motion, are specifically probed in the FIR but are not accessible by the more advanced visible nonlinear spectroscopy. This paper reviews the development of FIR nonlinear spectroscopy which took place essentially in the past decade, and gives examples on the one hand of harmonic generation which leads to evaluate nonlinear potentials of lattice ions and mobile carriers, and on the other hand describes laser-induced population changes in electronic states which result in both saturated absorption and saturated photoconductance.
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