# A tunable low-energy photon source for high-resolution angle-resolved photoemission spectroscopy

## TL;DR

This paper introduces a tunable, low-energy photon source based on a laser-driven xenon plasma lamp with a monochromator, suitable for high-resolution angle-resolved photoemission spectroscopy, offering high brightness and spectral precision.

## Contribution

The paper presents a novel, tunable photon source combining a xenon plasma lamp with a monochromator, achieving high brightness and narrow spectral bandwidth for laboratory photoemission studies.

## Key findings

- Photon source delivers >10^12 photons/sec at ~7 eV
- Spectral bandwidth as narrow as 10 meV
- Comparable performance to helium plasma lamps and synchrotron sources

## Abstract

We describe a tunable low-energy photon source consisting of a laser-driven xenon plasma lamp coupled to a Czerny-Turner monochromator. The combined tunability, brightness, and narrow spectral bandwidth make this light source useful in laboratory-based high-resolution photoemission spectroscopy experiments. The source supplies photons with energies up to ~7 eV, delivering under typical conditions >10^12 ph/s within a 10 meV spectral bandwidth, which is comparable to helium plasma lamps and many synchrotron beamlines. We first describe the lamp and monochromator system and then characterize its output, with attention to those parameters which are of interest for photoemission experiments. Finally, we present angle-resolved photoemission spectroscopy data using the light source and compare its performance to a conventional helium plasma lamp.