Femtosecond-precision synchronization of the pump-probe optical laser for user experiments at FLASH

S. Schulz; M. K. Czwalinna; M. Felber; P. Prędki; S. Schefer; H. Schlarb; U. Wegner

doi:10.1117/12.2021572

3 May 2013 Femtosecond-precision synchronization of the pump-probe optical laser for user experiments at FLASH

S. Schulz, M. K. Czwalinna, M. Felber, P. Prędki, S. Schefer, H. Schlarb, U. Wegner

Proceedings Volume 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation; 87780R (2013) https://doi.org/10.1117/12.2021572
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

In this paper, we present the long-term stable synchronization of the FLASH pump-probe Ti:sapphire oscillator to an optical reference with sub-10 fs (rms) timing jitter employing a balanced optical cross-correlator. The reference pulse train, transmitted over an actively transit time-stabilized 500m long fiber link, is generated by the FLASH master laser oscillator. This laser also provides the reference for several electron bunch arrival time monitors with sub-10 fs resolution, which in turn enables a longitudinal feedback reducing the electron bunch arrival time jitter to below 25 fs (rms). Combining the precise synchronization of the laser and the longitudinal accelerator feedback enabled a proof-of-principle pump-probe experiment at FLASH, ultimately showing a significant reduction of the timing jitter between the optical laser and the XUV pulses generated by the FEL, compared to the present standard operation.

Citation Download Citation

S. Schulz, M. K. Czwalinna, M. Felber, P. Prędki, S. Schefer, H. Schlarb, and U. Wegner "Femtosecond-precision synchronization of the pump-probe optical laser for user experiments at FLASH", Proc. SPIE 8778, Advances in X-ray Free-Electron Lasers II: Instrumentation, 87780R (3 May 2013); https://doi.org/10.1117/12.2021572

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