is undergoing a major upgrade. We have moved the facility across the campus to new, larger, labs in the Research Complex at Harwell
, adding a new 100 kHz laser system (a joint purchase with Ultra
) and a new XUV beamline.
The new laser will use OPCPA
technology to provide mid-infrared femtosecond pulses at 100 kHz repetition rate. For Artemis, the mid-infrared will enable the generation of higher photon energy XUV pulses and the higher repetition rate allows smaller samples to be studied. For Ultra, the appeal is the ability to provide broader spectral coverage at high repetition rates, for faster data acquisition, and more efficient generation of mid- to far-IR pulses.
The smaller of the two labs holds our two laser systems, while the larger lab holds three parallel XUV beamlines, and IR spectroscopy stations for Ultra. A custom-built external plant room holds chillers, cryo-compressors and backing pumps to minimise the noise levels in the lab.
The new Artemis labs, showing the ARPES and AMO end-stations (left and centre respectively). The imaging beamline is nearest t the camera, and the 1kHz monochromatised beamline is behind it.
100 kHz IR laser
The new laser system is a 100 kHz OPCPA system from Fastlite. The system has several outputs: 170 µJ at 1700 nm and 60 µJ at 3000 nm in < 50 fs pulses at fixed wavelengths for HHG, as well as a rapidly tuneable mode with slightly lower energy, which is more suitable for IR spectroscopy experiments. The laser system is pumped by a 200 W Yb:YAG system from Trumpf Scientific, based on an industrial micro-machining system.
100 kHz OPCPA system installed in the new laser lab.
1 kHz Ti:Sapphire laser
The existing Artemis 1 kHz RedDragon laser
has been upgraded with a third amplifier stage to provide 2 x 8 mJ pulses. This will enable us to offer HHG with second or third harmonic drive in conjunction with tuneable outputs from the Topas OPA system, or to further amplify the output of the OPA or hollow fibre.
1 kHz Ti:Sapphire system being re-installed in the new laser lab.
A new XUV beamline is being built for the 100 kHz laser system. This will include a flat-field spectrometer and a monochromator. The time-resolved ARPES
experiments will be the first to move to this new beamline.
The coherent lensless imaging beamline
has been extended, to enable longer focal lengths to be used to increase the high harmonic flux, and the monochromatised XUV beamline is being fully refurbished with new optics.
IR spectroscopy stations
Ultra will develop IR spectroscopy stations, to allow us to initially evaluate the performance of the stable, broadband mid-IR (> 4 µm) output of the new system. As well as the appeal of using such a source for ultrafast IR spectroscopy, the narrowband (~ 20 cm-1) pump laser opens up new opportunities in ultrafast Raman and unique hybrid narrowband/broadband capability, such as surface sum frequency generation and multidimensional spectroscopy techniques (e.g. electronic-vibrational-vibrational).
Building work in the new labs has now finished, and we are assembling beamlines and control systems. The 100 kHz laser system has met specifications at the factory and has been installed in the new laser labs. The newly expanded Artemis team
have completed final user experiments in the old labs, and moved offices into RCaH. We are now working to upgrade the current 1 kHz laser source and end-stations and to design the new 100 kHz HHG source, OPAs and beamline. Please get in touch if you are interested in becoming one of our first users and helping with commissioning experiments.
The new Artemis labs during assembly in Feb 2020. On the left is the 100 kHz experiment area. The 1 kHz experiment area to the right houses the 1 kHz monochromatised beamline with AMO end-station, and the imaging beamline.