The new ultrafast laser system at the heart of the UCL Ultrafast Laser Facility is a Coherent Astrella one-box Ti:Sapphire amplifier that generates 9 mJ pulses of 800 nm light at 1 kHz with 32 fs pulse duration. The output is split to pump 3 optical parametric amplifiers (providing wavelengths from 2.7 um – 235 nm), a harmonic generator (400, 267, 200 nm) and a KM Labs XUUS high harmonic generation system to generate EUV pulses (53 – 32 nm). This facility is used for femtosecond time-resolved photoelectron spectroscopy (TRPES) measurements in molecular and ion beams, liquid-microjets and on surfaces, as well as femtosecond transient absorption spectroscopy (TAS). If you are interested to learn more about the facility please contact Professor Helen Fielding and Dr David Bacon.
Transient absorption spectroscopy measurements are carried out in our Ultrafast Systems Helios Fire spectrometer. It is possible to measure processes on the femtosecond timescale following photoexcitation in the range 235-2700 nm. The probe range is 320-1600 nm and the time window is up to 8 ns. The spectrometer is equipped with a Harrick flow cell for liquid samples and a sample holder for thin films.
If you are interested in using our facility, please use the form below or click here if the form is not displaying correctly.