Ultrafast detection and autocorrelation of picosecond THz radiation pulses with a GaAs/AlAs superlattice
- 16 November 1998
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 73 (20) , 2983-2985
- https://doi.org/10.1063/1.122651
Abstract
We used a wide miniband GaAs/AlAs superlattice (at room temperature) for detection and autocorrelation of picosecond THz radiation pulses (frequency 4.3 THz) from a free-electron laser. The detection was based on a THz-field induced change in conductivity of the superlattice, and the correlation on the nonlinearity of the conductivity change at strong THz-pulse-power. The nonlinear conductivity change was due to two effects, which we attribute to dynamical localization of miniband electrons and to ionization of deep impurity centers.Keywords
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