Full characterization and optimization of a femtosecond ultraviolet laser source for time and angle-resolved photoemission on solid surfaces

J Faure; J Mauchain; E Papalazarou; W Yan; J Pinon; M Marsi; L Perfetti

doi:10.1063/1.3700190

Full characterization and optimization of a femtosecond ultraviolet laser source for time and angle-resolved photoemission on solid surfaces

Rev Sci Instrum. 2012 Apr;83(4):043109. doi: 10.1063/1.3700190.

Authors

J Faure¹, J Mauchain, E Papalazarou, W Yan, J Pinon, M Marsi, L Perfetti

Affiliation

¹ Laboratoire d'Optique Appliquée, ENSTA-CNRS-Ecole Polytechnique, UMR 7639, 91761 Palaiseau, France.

PMID: 22559517
DOI: 10.1063/1.3700190

Abstract

A novel experimental apparatus for time and angle-resolved photoemission on solid surfaces is presented. A 6.28 eV laser source operating at 250 kHz repetition rate is obtained by frequency mixing in nonlinear beta barium borate crystals. This UV light source has a high photon flux of 10(13) photons/s with relatively low number of photons/pulse so that Fermi surface mapping over a wide region of the Brillouin zone is possible while mitigating space charge effects. The UV source has been fully characterized spatially, spectrally, and temporally. Its potential for time and angle-resolved photoemission is demonstrated through Fermi surface mapping and photoexcited electron dynamics in Bismuth. True femtosecond time resolution <65 fs is obtained while the energy resolution of 70 meV appears to be mainly limited by the laser bandwidth.