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The Free-Electron Laser (FEL) FLASH offers the worldwide still uniquecapability to study ultrafast processes with high-flux, high-repetition rateXUV and soft X-ray pulses. The vast majority of experiments at FLASH are ofpump-probe type. Many of them rely on optical ultrafast lasers. Here, a novelFEL facility laser is reported which combines high average power output fromYb:YAG amplifiers with spectral broadening in a Herriott-type multi-pass celland subsequent pulse compression to sub-100 fs durations. Compared to otherfacility lasers employing optical parametric amplification, the new systemcomes with significantly improved noise figures, compactness, simplicity andpower efficiency. Like FLASH, the optical laser operates with 10 Hz burstrepetition rate. The bursts consist of 800 $\mu$s long trains of up to 800ultrashort pulses being synchronized to the FEL with femtosecond precision. Inthe experimental chamber, pulses with up to 50 $\mu$J energy, 60 fs FWHMduration and 1 MHz rate at 1.03 $\mu$m wavelength are available and can beadjusted by computer-control. Moreover, nonlinear polarization rotation isimplemented to improve laser pulse contrast. First cross-correlationmeasurements with the FEL at the plane-grating monochromator photon beamlineare demonstrated, exhibiting the suitability of the laser for user experimentsat FLASH.

Ultrafast MHz-rate burst-mode pump-probe laser for the FLASH FEL  facility based on nonlinear compression of ps-level pulses from an  Yb-amplifier chain