Characterization of laser-electron interaction at the BESSY II femtoslicing source

The energy modulation of 1.7-GeV electrons by femtosecond laser pulses was studied at the BESSY II ``femtoslicing'' source, a facility commissioned in 2004 for the purpose of producing sub-100 fs x-ray pulses. As a test case for future seeded free-electron lasers, the laser-electron interaction was investigated as function of various laser and electron beam parameters using different experimental methods.