Münster 1999 – scientific programme

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O: Oberflächenphysik

O 36: Poster (II)

O 36.87: Poster

Thursday, March 25, 1999, 20:00–22:30, Zelt

Synchronization of a Ti:Sapphire Laser to the BESSY Synchrotron: Time-Resolved Photoemission — •Diana Pop, B. Winter, T. Quast, I. Will, M.T. Wick, A. Liero, Ch. Pettenkofer, R. Rudolph, J. Gatzke, and I.V. Hertel — Max-Born-Institut, Rudower Chaussee 6, 12489 Berlin

The synchronization of a modelocked ultrafast Ti:sapphire laser

to the Berlin Electron Storage Ring for Synchrotron Radiation

(BESSY) is described. The technique, based on a phase-locked

loop using analog high harmonic mixing, may be easily applied

for either single, multi or hybrid bunch operation of the

synchrotron. Test experiments on the dynamics of laser-excited

carriers in InSe, specifically on the decay of the surface

photovoltage (SPV), performed at BESSY I demonstrate the

potential and reliability of this technique, and provide the

basis for future time-resolved laser/synchrotron experiments at

BESSY II. The Max-Born-Institute currently establishes a User

Facility at BESSY II, a third generation synchrotron, dedicated

to investigate the dynamics of photon-induced processes by

time-synchronized laser and synchrotron-undulator pulses in a

pump-probe scheme. Two-color two-photon photoemission (2C-2PPE)

with excitation photon energies up to 350 eV will be the main

experimental method to be applied. The facility will become

available in 1999.