Invitation to online seminar Matthias Wollenhaupt, University of Oldenburg, Germany on "Multiphoton Ionization with Shaped Femtosecond Laser Pulses"

[ICTP/director]

*/On behalf of Prof. Alfonso Franciosi, President and Chief Executive 
Officer of Elettra-Sincrotrone Trieste, we wish to extend this 
invitation to your scientific community/*

You are most cordially invited to the online seminar of Matthias 
Wollenhaupt, University of Oldenburg, Germany on "Multiphoton Ionization 
with Shaped Femtosecond Laser Pulses" onThursday 7 October at 10:00 am 
CET (Ref.  Kevin Prince).

Link to connect to the videoconference:

*https://us02web.zoom.us/j/83096936794?pwd=SDI4TXNlemtOcFhNNUFJakRYOXhOUT09*

We look forward to seeing you online!

With best regards,

Office of the Chief Executive Officer, Elettra-Sincrotrone Trieste

**

*Abstract***

In this talk, we give a brief introduction to frequency-domain 
femtosecond pulse shaping and applications for coherent control of 
perturbative and non-perturbative multiphoton ionization (MPI) of atoms 
and small molecules. An overview of some of our work can be found in [1].

We begin our discussion of coherent control with established pulse 
shapes such as phase-locked double- and multipulse sequences as well as 
chirped pulses. More advanced pulse shapes are presented including the 
generalized spectral step function and Airy pulses. In our recent 
experiments we sculpture multichromatic fields from a 
carrier-envelope-phase stable over-octave spanning white light 
supercontinuum by spectral amplitude and phase modulation. Using 
additional broadband polarizers and lambda plates in our pulse shaper we 
achieve fully polarization-tailored multichromatic fields.

Applications of the shaped pulses in atomic and molecular MPI include 
the manipulation of dressed states [2], control of coupled 
electron-nuclear dynamics [3], spin-orbit [4] and Rydberg [5] wave 
packet dynamics along with directional photoemission [6] and the 
generation of free electron vortices with even [7] and odd [8] numbered 
rotational symmetry.

[1] K. Eickhoff, L. Englert, T. Bayer and M. Wollenhaupt, Front. Phys. 
*9*,675258 (2021)
[2] T. Bayer, M. Wollenhaupt, H. Braun and T. Baumert, Adv. Chem. Phys. 
*159, *235–282 (2016)
[3] T. Bayer, H. Braun, C. Sarpe, R. Siemering, P. von den Hoff, R. de 
Vivie-Riedle, T. Baumert and M. Wollenhaupt, Physical Review Letters 
*110*,123003 (2013)
[4] T. Bayer, D. Gräfing, S. Kerbstadt, D. Pengel, K. Eickhoff, L. 
Englert and M. Wollenhaupt, New J. Phys. *21*,033001 (2019)
[5] K. Eickhoff, S. Kerbstadt, T. Bayer and M. Wollenhaupt, Phys. Rev. A 
*101*,013430 (2020)
[6] S. Kerbstadt, D. Pengel, L. Englert, T. Bayer and M. Wollenhaupt, 
Phys. Rev. A97, 063402 (2018)
[7] D. Pengel, S. Kerbstadt, D. Johannmeyer, L. Englert, T. Bayer and M. 
Wollenhaupt, Phys. Rev. Lett. *118*,053003 (2017)
[8] S. Kerbstadt, K. Eickhoff, T. Bayer and M. Wollenhaupt, Nature 
Communications *10*, 658 (2019)