Ultrafast Surface Science Laboratory @ LLUm

Laser type: Ti:Sapphire laser
Parameter summary: Spectral range: tunable around 260 nm, 390 nm, 500-600 nm, 780 nm, 1-1.5 um, 2.5-3 um. Pulse duration down to 20 fs at 790 nm and around 40 fs depending on the wavelenght. Pulse energy: 0.1-15 nJ/pulse.

Key experimental stations

Surface Science Station

  • Type of experiment: Time-resolved two-photon photoemission spectroscopy
  • Description: Pump probe setup for studies of materials, surfaces and interfaces. Ti:Sapphire laser or a Ti:Sapphire pumped OPO is used to excite the sample. Low energy harmonics of the Ti:Sapphire laser are used to eject photoelectrons from the sample. A 2D photoelectron spectrometer (Scienta Omicron R3000) is used for measuring the photoelectrons energy and momentum.
  • Beam parameters: 100 Hz-80 MHz repetition rate, 0.5-5 eV photon energy, 20-40 fs pulse duration, 0.1-15 nJ pulse energy
  • Auxiliary equipment: LEED/Auger spectroscopy, 6 sources for epitaxial growth of semiconductors, QCMB, alkali metal sources (K, Na, Cs), UHV gas dosers, sputter gun, RGA, sample manipulator temp from 4K up to 1800 K, pressure down to 1e-10 mBar
  • Contact person: Piotr Matyba