Terahertz wave rectification in a ferroelectric triglycine sulfate single crystal

The effect of optical rectification (OR) in the terahertz range (THz rectification, TR) is experimentally demonstrated. The effect consists of generating a DC voltage on the faces of a ferroelectric triglycine sulfate (TGS) single crystal under the action of pulsed radiation with a frequency of 1.57 and 1.96 THz and an electric field strength per pulse of 1.3 and 1.5 MV/m, respectively. The FLARE FELIX free-electron laser system (Radboud University, The Netherlands) was used as a THz radiation source. The TR effect makes it possible to directly determine the nonlinear susceptibilities of media (including those under conditions of strong absorption) without any reference or optical channel calibration and also without the need of Fourier transform.(c) 2023 Optica Publishing Group

Automated summary

This study demonstrates the effect of optical rectification (OR) in the terahertz range (THz rectification, TR). By applying pulsed radiation with specific frequencies and electric field strengths, a direct current voltage is generated on the surfaces of a ferroelectric triglycine sulfate (TGS) single crystal. The TR effect allows for the direct determination of the nonlinear susceptibilities of media, even under strong absorption conditions, without reference or optical channel calibration, and without the need for Fourier transform.