Polarization-sensitive terahertz time-domain spectroscopy system without mechanical moving parts

TL;DR

This paper introduces a polarization-sensitive terahertz time-domain spectroscopy system that operates without mechanical moving parts, combining dual laser sources and electro-optic modulation for robust and precise measurements.

Contribution

It presents a novel, fully optical system for polarization-sensitive terahertz spectroscopy that eliminates mechanical components, enhancing stability and applicability.

Findings

Successfully demonstrated polarization measurement without mechanical parts

Achieved stable and accurate terahertz electric-field waveform detection

System enables practical applications in science and industry

Abstract

We report on the measurement of terahertz electric-field vector waveforms by using a system that contains no mechanical moving parts. It is known that two phase-locked femtosecond lasers with different repetition rates can be used to perform time-domain spectroscopy without using a mechanical delay stage. Furthermore, an electro-optic modulator can be used to perform polarization measurements without rotating any polarizers or waveplates. We experimentally demonstrate the combination of these two methods and explain the analysis of data obtained by such a system. Such a system provides a robust platform that can promote the usage of polarization-sensitive terahertz time-domain spectroscopy in basic science and practical applications. For the experimental demonstration, we alter the polarization of a terahertz wave by a polarizer.