The major research equipment of the Attosecond Light Pulse Source of the Extreme Light Infrastructure (ELI-ALPS) are driven by laser pulses of few cycle duration operating in the 100 W average power regime. The peak power and the repetition rate span from 1 TW at 100 kHz up to PW at 10 Hz. The systems are designed for stable and reliable operation, yet to deliver pulses with unique parameters, especially with unmatched fluxes and extreme bandwidths. This exceptional performance will enable the generation of secondary sources with exceptional characteristics, including light sources ranging from the THz to the X-ray spectral ranges, and particle sources.
The experimental activities in the building complex to be inaugurated early 2017 will start with the installation of the two 100 kHz repetition rate, CEP stabilized lasers in May 2017. The MIR laser produces 0.15mJ, shorter than 4-optical-cylce pulses tunable between 2.5-3.9 µm. The first stage of the HR laser will provide pulses around 1 µm with 1 mJ energy and pulse duration less than 6.2 fs. The systems will be optically synchronized to each other with a temporal jitter below 1 fs.
Along with the installation of the lasers, we will also start the assembly of the high harmonic beamlines and the THz laboratory, as well as nanoplasmonic experiments. The XUV bursts of light with attosecond duration are expected to be generated by the end of 2017.
In this work we have measured the group-delay dispersion of an empty Michelson interferometer for s- and p-polarized
light beams applying two different non-polarizing beam splitter cubes. The interference pattern appearing at the output of
the interferometer was resolved with two different spectrometers. It was found that the group-delay dispersion of the empty
interferometer depended on the polarization directions in case of both beam splitter cubes. The results were checked by
inserting a glass plate in the sample arm of the interferometer and similar difference was obtained for the two polarization
directions. These results show that to reach high precision, linearly polarized white light beam should be used and the
residual dispersion of the empty interferometer should be measured at both polarization directions.