Abstract

Ultrashort pulses of intense, coherent, and tunable far-infrared and mid-infrared radiation, achievable with free-electron lasers and optical parametric amplifiers, 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: far-infrared spectroscopy of transient plasmas, picosecond time-resolved cyclotron resonance, terahertz sideband generation, and the dynamic Franz-Keldysh effect. PACS codes: 78J0.-e, 78.30. Fs, 78.20. Jq, 78.20. Ls

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