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Mueller, F.     [Müller, F.]

Paper Title Page
TUPB42 A Compact Single Shot Electro-Optical Bunch Length Monitor for the SwissFEL 263
 
  • B. Steffen, V. Schlott
    PSI, Villigen
  • F. Müller
    IAP Univ. Bern, Bern
 
 

The knowledge and control of electron bunch lengths is one of the key diagnostics in XFEL accelerators to reach the desired peak current in the electron beam. A compact electro-optical monitor was designed and build for bunch length measurements at the Swiss FEL. It is based on a mode locked ytterbium fiber laser probing the field-induced birefringence in an electro-optically active crystal (GaP) with a chirped laser pulse. The setup allows the direct time resolved single-shot measurement of the Coulomb field (THz-radiation) of the electron beam -and therefore the bunch length- with an accuracy as good as 200fs. Simulations of the signals expected at the SwissFEL and the results of first test at the SLS linac will be presented.

 
TUPD31 Ytterbium Fiber Laser for Electro-Optical Pulse Length Measurements at the SwissFEL 366
 
  • F. Müller, S. Hunziker, V. Schlott, B. Steffen, D.M. Treyer
    PSI, Villigen
  • T. Feurer, F. Müller
    IAP Univ. Bern, Bern
 
 

Pulsed Yb fiber lasers emit at 1030 nm which provides a better phase matching in standard EO crystals (GaP, ZnTe) than Ti:Sa lasers (800nm). We present a mode locked ytterbium fiber laser which is phase locked to the RF. A subsequent fiber amplifier is used to boost the power and to broaden the spectrum due to nonlinear effects. The produced pulses have a spectral width of up to 100 nm and are therefore suitable for EO bunch length measurements, especially for spectral decoding. The laser delivers a chirped pulse of some ps, the fourier limited pulse duration of ~30 fs can be almost reached by an additional shaper setup with a spatial light modulator in the Fourier plane.

 
TUPD31 Ytterbium Fiber Laser for Electro-Optical Pulse Length Measurements at the SwissFEL 366
 
  • F. Müller, S. Hunziker, V. Schlott, B. Steffen, D.M. Treyer
    PSI, Villigen
  • T. Feurer, F. Müller
    IAP Univ. Bern, Bern
 
 

Pulsed Yb fiber lasers emit at 1030 nm which provides a better phase matching in standard EO crystals (GaP, ZnTe) than Ti:Sa lasers (800nm). We present a mode locked ytterbium fiber laser which is phase locked to the RF. A subsequent fiber amplifier is used to boost the power and to broaden the spectrum due to nonlinear effects. The produced pulses have a spectral width of up to 100 nm and are therefore suitable for EO bunch length measurements, especially for spectral decoding. The laser delivers a chirped pulse of some ps, the fourier limited pulse duration of ~30 fs can be almost reached by an additional shaper setup with a spatial light modulator in the Fourier plane.