Abstract
Ultrashort pulses of intense, coherent, and tunable far-infrared (FIR) and mid-infrared (MIR) radiation, achievable with free-electron lasers (FELs) and optical parametric amplifiers (OPAs), provide unique opportunities to investigate low energy dynamics in solids. This paper reviews our recent experiments on bulk and quantum-confined semiconductors using such radiation. These experiments include: FIR spectroscopy of transient plasmas and magneto-plasmas, picosecond time-resolved cyclotron resonance, sideband and harmonic generation, the dynamical Franz-Keldysh effect, and AC ionization dynamics of quantum-well excitons.
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