SAMOP 2023 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: Interaction with Strong or Short Laser Pulses III (joint session A/MO)
MO 19.3: Talk
Thursday, March 9, 2023, 15:15–15:30, F107
Intra-cavity multiphoton processes in a standing wave frequency comb — •Tobias Heldt1, Jan-Hendrik Oelmann1, Lennart Guth1, Janko Nauta1, Prachi Nagpal1, Nick Lackmann1, Nele Griesbach1, Christoph Düllmann2, Thomas Pfeifer1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Johannes Gutenberg-Universität, 55099 Mainz, Germany
The coherence of frequency combs gives rise to a wide field of powerful spectroscopic techniques. Additionally, the high repetition rate of a comb leads to experimentally manageable count rates even for processes with low cross-sections. We use these properties to study the nonlinear regime of atomic and solid-state light-matter interaction. To reach the necessary field strengths, we enhance a frequency comb at 100 MHz in a cavity to intensities of over 1013 W/cm2. The polarization insensitive bow-tie ring cavity supports counterpropagating pulses which collide in the focus, where they generate a standing wave for the time of the pulse overlap. This geometry is promising because not only does it reduce the interaction volume, enhancing the resolution of our velocity map imaging (VMI) spectrometer [1], but it also allows Doppler-free excitation of atoms. The polarization of both pulses can be controlled independently and an additional third pulse renders versatile pump-probe experiments possible. Further, we plan to probe the field with nanometric tips and we investigate how plasmons could lead to an excitation of the nuclear isomeric state of thorium-229 on such tips. [1] J.-H. Oelmann et al., Rev. Sci. Instrum., accepted (2022)