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

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. (C) 2012 American Institute of Physics.
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Submitted on : Thursday, September 25, 2014 - 4:34:19 PM
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Jérôme Faure, J. Mauchain, E. Papalazarou, W. Yan, J. Pinon, et al.. Full characterization and optimization of a femtosecond ultraviolet laser source for time and angle-resolved photoemission on solid surfaces. Review of Scientific Instruments, American Institute of Physics, 2012, 83, pp.043109. ⟨10.1063/1.3700190⟩. ⟨hal-01068487⟩

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