Abstract
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.
Highlights
A laser pulse copropagating with an electron bunch in an undulator modulates the electron energy if the resonance condition L U 2 2 K2 2 (1)is fulfilled, i.e., if the laser wavelength L equals the wavelength of spontaneous undulator radiation
The oscillatory energy modulation has a period length equal to L and an envelope corresponding to the laser pulse shape enlarged by LNU, the distance by which electrons slip relative to the laser field over NU undulator periods
Laser-induced energy modulation has a number of promising applications, among them seeding schemes for free-electron lasers (FELs) such as high-gain harmonic generation (HGHG) [1], enhanced self-amplified spontaneous emission (ESASE) [2] or sideband seeding [3]
Summary
A laser pulse copropagating with an electron bunch in an undulator modulates the electron energy if the resonance condition. Laser-induced energy modulation has a number of promising applications, among them seeding schemes for free-electron lasers (FELs) such as high-gain harmonic generation (HGHG) [1], enhanced self-amplified spontaneous emission (ESASE) [2] or sideband seeding [3]. It is the basis of ‘‘femtoslicing,’’ a method to produce subpicosecond synchrotron radiation pulses in storage rings [4,5], and of schemes to generate subfemtosecond x-ray pulses in FELs [6 –8]. Femtoslicing serves as a test case for FEL seeding schemes, allowing to study the dependence of the energy modulation process on various parameters
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