Artemis is based on high repetition rate, few optical cycle and widely tuneable laser sources, and ultrafast XUV (10-100 eV) pulses produced through high harmonic generation. Vacuum beamlines deliver the synchronised pulses to end-stations for condensed matter physics and gas-phase chemistry. Experiments on Artemis use high harmonic generation to investigate ultrafast dynamics in experiments on gas, liquid and solid materials. We also exploit the spatial coherence of the XUV to use coherent diffractive imaging techniques.
Applications of XUV pulses on Artemis include photoelectron spectroscopy with XUV probe pulses, high harmonic generation spectroscopy, and ultrafast demagnetisation. Artemis aims to combine femtosecond laser and synchrotron technologies to enable new science in the emerging field of ultrafast x-rays.
A key technique used on Artemis is time and angle resolved photoelectron spectroscopy, which enables the electronic structure of a material to be monitored as it responds to excitation by a laser pulse. The target material is irradiated by a short laser pulse, which induces structural changes and excitations. It is then probed at a series of time delays by a short wavelength pulse which generates photoelectrons that are then collected and analysed. The Artemis beamline was one of the first in the world to use XUV pulses from high-order laser harmonics for photoemission. The higher photon energy enables electrons with a much wider range of energy and momentum space to be detected, meaning that each snapshot of electronic structure has a much wider field of view.
Artemis has just been
upgraded and moved to new lab space in the Research Complex at Harwell. The upgrade includes a
100 kHz IR laser system and an additional XUV beamline.