We have developed an angle-resolved photoemission spectrometer with tunable VUV laser as a photon source. The photon source is based on the fourth harmonic generation of a near IR beam from a Ti:sapphire laser pumped by a CW green laser and tunable between 5.3eV and 7eV. The most important part of the set-up is a compact, vacuum enclosed fourth harmonic generator based on KBBF crystals, grown hydrothermally in the US. This source can deliver a photon flux of over 10^14 photons/s. We demonstrate that this energy range is sufficient to measure the kz dispersion in an iron arsenic high temperature superconductor, which was previously only possible at synchrotron facilities.
@article{arxiv.1401.5404,
title = {Tunable VUV laser based spectrometer for Angle Resolved Photoemission Spectroscopy (ARPES)},
author = {Rui Jiang and Daixiang Mou and Yun Wu and Lunan Huang and Colin D. McMillen and Joseph Kolis and Henry G. Giesber and John J. Egan and Adam Kaminski},
journal= {arXiv preprint arXiv:1401.5404},
year = {2017}
}