The authors demonstrate the generation of multicycle narrow-bandwidth terahertz pulses in periodically inverted GaAs structures using optical rectification of 2 mu m, 100 fs pump pulses. Three different types of orientation-inverted samples are employed: optically contacted multilayer, orientation-patterned, and diffusion-bonded GaAs. The terahertz pulses are characterized by two-color (pump at 2 mu m and probe at 0.8 mu m) terahertz time-domain spectroscopy and terahertz Michelson interferometry. (c) 2006 American Institute of Physics.
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