Phase-sensitive Photoelectron Metrology – Dr. P. Hockett, presentation at DAMOP 2017 from femtolab.ca on Vimeo.
quantum metrology
Angle-resolved RABBIT: theory and numerics
Update 28/06/17 – Now published in J. Phys. B, special issue on Correlations in Light-Matter Interactions.
New manuscript:
Angle-resolved RABBIT: theory and numerics
P. Hockett
Angle-resolved (AR) RABBIT measurements offer a high information content measurement scheme, due to the presence of multiple, interfering, ionization channels combined with a phase-sensitive observable in the form of angle and time-resolved photoelectron interferograms. In order to explore the characteristics and potentials of AR-RABBIT, a perturbative 2-photon model is developed; based on this model, example AR-RABBIT results are computed for model and real systems, for a range of RABBIT schemes. These results indicate some of the phenomena to be expected in AR-RABBIT measurements, and suggest various applications of the technique in photoionization metrology.
Paul Hockett 2017 J. Phys. B: At. Mol. Opt. Phys. 50 154002
Pre-print available via Authorea, DOI: 10.22541/au.149037518.89916908.
See also the recent AR-RABBIT presentation for a brief intro to this topic.
Angle-resolved RABBIT: new work and presentation
The above image shows simulated velocity map images (left, middle) and angle and time-resolved measurements (right) for angle-resolved RABBIT measurements. In this type of measurement, XUV and IR pulses are combined, and create a set of 1 and 2-photon bands in the photoelectron spectrum. The presence of multiple interfering pathways to each final photoelectron band (energy) results in complex and information rich interferograms, with both angle and time-dependence.
A manuscript detailing this work is currently in preparation, and a recent presentation detailing some aspects of the work can be found on Figshare.
Update 24th March – new manuscript, Angle-resolved RABBIT: theory and numerics, pre-print available.
Coherent quantum control & metrology
UPDATE March 2016 – The article has been chosen for the JPB Highlights of 2015 selection, which features articles selected for their “outstanding quality and impact within the field”. The articles in the collection will be open access for the year.
Our recent paper on coherent control & quantum metrology is now published in J. Phys. B:
Coherent control of photoelectron wavepacket angular interferograms
P Hockett, M Wollenhaupt and T Baumert
J. Phys. B: At. Mol. Opt. Phys. 48 (2015) 214004.
doi: 10.1088/0953-4075/48/21/214004
Coherent control over photoelectron wavepackets, via the use of polarization-shaped laser pulses, can be understood as a time and polarization-multiplexed process, where the final (time-integrated) observable coherently samples all instantaneous states of the light–matter interaction. In this work, we investigate this multiplexing via computation of the observable photoelectron angular interferograms resulting from multi-photon atomic ionization with polarization-shaped laser pulses. We consider the polarization sensitivity of both the instantaneous and cumulative continuum wavefunction; the nature of the coherent control over the resultant photoelectron interferogram is thus explored in detail. Based on this understanding, the use of coherent control with polarization-shaped pulses as a methodology for a highly multiplexed coherent quantum metrology is also investigated, and defined in terms of the information content of the observable.
The work is part of the special issue on Coherence and Control in the Quantum World.
The manuscript is also available on the arxiv.
UPDATE Nov. 2015 – Chosen for the cover of the 14th November 2015 print edition.
Maximum-information photoelectron metrology
Two new articles, on quantum metrology via polarization-shaped pulses (mostly theory) and maximum-information photoelectron metrology via tomographic measurements (mostly experiment), have just been published in PRA.
P. Hockett, M. Wollenhaupt, C. Lux, and T. Baumert
Phys. Rev. A 92, 013411 – Published 13 July 2015
(also available at arXiv:1503.08247 (2015))
Maximum-information photoelectron metrology
Phys. Rev. A 92, 013412 – Published 13 July 2015
(also available at arXiv:1503.08308 (2015))