I work with the Blackett Laser Consortium on attosecond, strong field, and ultrafast physics. By using extremely short and/or fast laser pulses, we can examine extremely fast quantum dynamics. With a new generation of laser sources and laser technologies boasting high intensities, short wavelengths, and ultrafast durations, we are now able to image and control matter at an unprecedented level.
My work with the Laser Consortium has two main thrusts - developing new sources for attosecond physics, and using them to track charge migration inside molecules. We have developed new few-cycle duration IR driving sources for generation of soft X-ray attosecond pulses, and generated attosecond pulses in the so-called water window region (284-540 eV).
More recently I have been focused on using ultrafast optical and X-ray sources to examine correlated materials (such as superconductors). More information at http://allansjohnson.net/
et al., 2018, High-flux soft x-ray harmonic generation from ionization-shaped few-cycle laser pulses, Science Advances, Vol:4, ISSN:2375-2548
et al., 2017, Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning, Nature Communications, Vol:8, ISSN:2041-1723
et al., 2016, Measurement of sulfur L2,3 and carbon K edge XANES in a polythiophene film using a high harmonic supercontinuum, Structural Dynamics, Vol:3, ISSN:2329-7778
et al., 2013, Direct Determination of Absolute Molecular Stereochemistry in Gas Phase by Coulomb Explosion Imaging, Science, Vol:341, ISSN:0036-8075, Pages:1096-1100
et al., 2013, Trajectory-Resolved Coulomb Focusing in Tunnel Ionization of Atoms with Intense, Elliptically Polarized Laser Pulses, Physical Review Letters, Vol:111, ISSN:0031-9007
et al., 2013, Full characterization of polarization states of light via direct measurement, Nature Photonics, Vol:7, ISSN:1749-4885, Pages:316-321