Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Posters 1: Ultrafast Spectroscopy

MO 13.16: Poster

Tuesday, March 6, 2018, 16:15–18:15, Orangerie

Generating laser-pulse enantiomers — Andreas Steinbacher^1,2, •Heiko Hildenbrand¹, Sebastian Schott¹, Johannes Buback¹, Marco Schmid¹, Patrick Nuernberger³, and Tobias Brixner¹ — ¹Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — ²Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA — ³Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum

We developed an optical setup capable of mirroring an arbitrary, potentially time-varying, polarization state of an ultrashort broadband laser pulse [1]. This is achieved by splitting up the incident beam in two separate beams of which one is mirrored by reflection off a mirror in normal incidence. Afterwards, both beams are recombined in time and space such that two collinearly propagating ultrashort laser pulses with mutually mirrored polarization, i.e., laser-pulse enantiomers, leave the setup. Via this approach, wave plates are not needed and broadband pulses in a large wavelength range can be processed.

Since the two beams travel separately through the optical system, shot-to-shot chopping and detection schemes can be applied. These capabilities are desired, e.g., for circular dichroism, ellipsometry, anisotropy or chiral quantum control experiments. As an application example, the latest progress on time-resolved circular dichroism and transient absorption spectroscopy on the early photochemistry of oxygenated myoglobin is presented.

[1] Steinbacher et al., Opt. Express 25, 21736 (2017)