Open AccessHigh-field THz pulses from a GaAs photoconductive emitter for non-linear THz studies
Author(s) -
Abhishek Singh,
Jiang Li,
Alexej Pashkin,
Rakesh Rana,
Stephan Winnerl,
Manfred Helm,
Harald Schneider
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.427247
Subject(s) - terahertz radiation , optics , materials science , optoelectronics , optical rectification , laser , common emitter , electric field , terahertz spectroscopy and technology , photoconductivity , photomixing , femtosecond , far infrared laser , nonlinear optics , physics , terahertz metamaterials , quantum mechanics
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.