Overview  |  Orbital and Spin angular momenta in the XUV  |  Objectives  |  Tasks  |  Equipments  | 

Laser systems

We are carrying most of our research locally, on the SLIC laser systems . There are currently two Ti:Sapphire lasers on which we run attosecond beamlines: FAB1 just getting started and LUCA. LUCA is a 20 Hz, 50 fs, 30 mJ laser, which mode is spatially filtered by a fiber (see Ge et al.)). FAB1 is working at a repetition rate of 1 KHz, and delivers pulses of about 25 fs, 13 mJ. It may be coupled to a light conversion high energy topas, yielding a full tunability between 1200 nm and 1600 nm wavelength, finally yielding a continuously accordable XUV spectrum.

We are currently moving to the new Attolab facility where FAB1 is running since July 2016 and FAB10 is getting ready. This last system works at a 10 kHz repetition rate. It will deliver 20-25 fs long pulses with 2 mJ with a stabilized carrier envelope phase. The commissioning of the associated XUV beamlines is expected late 2016/beginning 2017.

Attosecond beamlines

Our attosecond beamlines are constructed to offer the most complete diagnosis of the XUV emission. Our current setups, which are highly flexible usually look like the one depicted in the figure below. Basically, we intend to be able to measure a spectral amplitude and a spectral phase of the source using two-photon spectroscopy with the RABBIT technique (see e.g. Ruchon & Camper)) and a photon spectrometer positioned downstream. During Antoine Camper's PhD thesis, we implemented an extra option by which we can perfom comparisons as for the phase of two adjacent HHG sources, one being possibly pumped (see Antoine Camper's Thesis). The trick to get an excellent interferometric stability between the sources is to use a binary phase mask to create them. We are now building up a more steady such beamline to be implemented on FAB10 with little flexibility, while keeping two beamlines on FAB1 with a high versatility.



Typical arrangement of our attosecond beamlines. This setup allows both spectral phase and amplitude measuremements at once. It also allows comparing two sources, one of them being pumped.