Tunable vacuum ultraviolet laser based spectrometer for angle resolved photoemission spectroscopy

Rui Jiang; Daixiang Mou; Yun Wu; Lunan Huang; Colin D McMillen; Joseph Kolis; Henry G Giesber 3rd; John J Egan; Adam Kaminski

doi:10.1063/1.4867517

Tunable vacuum ultraviolet laser based spectrometer for angle resolved photoemission spectroscopy

Rev Sci Instrum. 2014 Mar;85(3):033902. doi: 10.1063/1.4867517.

Authors

Rui Jiang¹, Daixiang Mou¹, Yun Wu¹, Lunan Huang¹, Colin D McMillen², Joseph Kolis², Henry G Giesber 3rd³, John J Egan³, Adam Kaminski¹

Affiliations

¹ Division of Materials Science and Engineering, Ames Laboratory, Ames, Iowa 50011, USA.
² Department of Chemistry, Clemson University, Clemson, South Carolina 29634, USA.
³ Advanced Photonic Crystals LLC, Fort Mill, South Carolina 29708, USA.

PMID: 24689595
DOI: 10.1063/1.4867517

Abstract

We have developed an angle-resolved photoemission spectrometer with tunable vacuum ultraviolet 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 5.3 eV and 7 eV. The most important part of the set-up is a compact, vacuum enclosed fourth harmonic generator based on potassium beryllium fluoroborate crystals, grown hydrothermally in the US. This source can deliver a photon flux of over 10(14) photon/s. We demonstrate that this energy range is sufficient to measure the k(z) dispersion in an iron arsenic high temperature superconductor, which was previously only possible at synchrotron facilities.