Optical laser pulses, matched with and synchronized to the FEL pulse train are provided for time-resolved pump-probe experiments. The EuXFEL laser group has developed a pump-probe laser based on non-collinear optical parametric amplification (NOPA). Currently available parameters:
| wavelength | pulse duration | repetition rate | pulse energy |
| 800 nm | 15 fs | 1.1 MHz | 0.2 mJ |
| 800 nm | 15 fs | 188 kHz | 1.0 mJ |
| 800 nm | 15 fs | 100 kHz | 1.8 mJ |
| 400 nm | 50 fs | 188 kHz | 0.3 mJ |
| 266 nm | 50 fs | 188 kHz | 6 μJ |
| 1030 nm | 50 fs | 1.1 MHz | 2.0 mJ |
| 1030 nm | 900 fs | 1.1 MHz | 2.5 mJ |
| 1030 nm | 400 ps | 1.1 MHz | 2.5 mJ |
Additional wavelength conversion to the MIR region is possible with a commercial Optical Parametric Amplifier based on the 1030nm parameters. Additional harmonics of the 800 and 1030 nm light can be considered for experiments, but must be discussed with the SQS Laser team first to determine feasibility. We are continuously aiming to extent the available parameters for experiments.
For pump-probe experiments, an optical synchronization system maintains the overall timing jitter of <10 fs RMS between oscillators seeding the optical laser amplifiers, the injector laser and multiple optical references in our linear accelerator. The latter can be used to measure the relative arrival time of the electron bunches on a single-shot basis, reducing the overall timing jitter to a few tens of femtoseconds.
Do not hesitate to contact Dirk for more information or any special requests!