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High-field THz pulses from GaAs photoconductive emitter for non-linear THz studies

Singh, A.; Li, J.; Pashkin, O.; Rana, R.; Winnerl, S.; Helm, M.; Schneider, H.

We report the emission of high-field terahertz pulses from a GaAs large-area photoconductive emitter pumped with a Ti:Sapphire amplifier laser system at 800 nm wavelength and 1 kHz repetition rate. The maximum estimated terahertz electric field at the focus is ≳ 230 kV/cm. We also demonstrate the capability of the terahertz field to cause a non-linear effect, which usually requires high-field terahertz pulses generated through optical rectification or an air plasma. A significant drop in the optical conductivity of optically pumped GaAs due to Γ-L inter-valley scattering of free electrons caused by the strong THz field is found.

Keywords: Terahertz sources; Nonlinear THz; Photoconductive emitter

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Permalink: https://www.hzdr.de/publications/Publ-32614
Publ.-Id: 32614