# Bow-Tie Cavity for Terahertz Radiation

## TL;DR

This paper presents the development and testing of a bow-tie resonant cavity for terahertz radiation, achieving high finesse and quality factor, with detailed theoretical and experimental analysis.

## Contribution

It introduces a novel bow-tie cavity design for THz radiation with improved performance metrics and comprehensive theoretical and experimental evaluation.

## Key findings

- Measured finesse F=123
- Quality factor Q=5.1x10^5
- Good agreement between simulated and experimental spectra

## Abstract

We report on the development, testing, and performance analysis of a bow-tie resonant cavity for terahertz (THz) radiation, injected with a continuous-wave 2.55 THz quantum cascade laser. The bow-tie cavity employs a wire-grid polarizer as input/output coupler and a pair of copper spherical mirrors coated with an unprotected 500 nm thick gold layer. The improvements with respect to previous setups have led to a measured finesse value F=123, and a quality factor Q = 5.1x10^5. The resonator performances and the relevant parameters are theoretically predicted and discussed, and a comparison among simulated and experimental spectra is given.

---
Source: https://tomesphere.com/paper/1904.13143