A Modified $8f$ Geometry With Reduced Optical Aberrations For Improved Time Domain Terahertz Spectroscopy

TL;DR

This paper introduces a modified 8f optical geometry for time domain terahertz spectroscopy that significantly reduces optical aberrations and focal spot size, enhancing measurement precision.

Contribution

The study presents a simple rearrangement of off-axis parabolic mirrors in the 8f setup, leading to nearly 40% smaller THz focal spots and reduced aberrations, improving TDTS performance.

Findings

40% reduction in THz focal spot size

Significant reduction of optical aberrations

Improved spectral measurement quality

Abstract

We present a modified $8f$ geometry for time domain terahertz (THz) spectroscopy (TDTS) experiments. We show, through simulations and data, that a simple rearranging of the off-axis parabolic mirrors, which are typically used to focus and direct THz radiation in TDTS experiments, results in a nearly 40% reduction in the THz focal spot diameter. This effect stems from significant reduction of the principle optical aberrations which are enhanced in the conventional $8f$ geometry but partially compensated in the modified $8f$ experimental setup. We compare data from our home-built TDTS spectrometer in the modified $8f$ geometry to that of previous iterations that were designed in the conventional $8f$ geometry to demonstrate the effect.