The attosecond beamline at MPIK
A spectrum of high harmonic radiation generated in Argon at about 200 mbar target pressure
The attosecond beamline at MPIK is designed for the investigation of the electronic response in atoms and molecules in unprecedented detail by combining a versatile HHG-source with a dedicated reaction microscope. The setup is based on a commercial TiSa laser system delivering phase-stable pulses at 800nm, where the repetition rate is adjustable between 8 and 10 kHz. The laser pulses are focused into a gas target of some millimetres thickness, where nonlinear interaction of the intense electromagnetic field with the target atoms – Argon or Neon depending on the desired wavelength – lead to the emission of high harmonic radiation.
In order to ensure the setup to be sufficiently stable for pump-probe experiments with attosecond resolution, all optics related to the pump probe scheme and the focussing of IR- and VUV pulses are mounted on the same breadboard inside the HHG-chamber. The compact design of our reaction microscope is advantageous as it allows to keep the focal distances short, hence achieving sufficiently tight focusing.
Schematic drawing of the attosecond experiment at MPIK.