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A: Fachverband Atomphysik

A 16: Interaction with strong or short laser pulses I

A 16.6: Vortrag

Mittwoch, 11. März 2020, 12:30–12:45, a320

Intra-cavity velocity-map imaging at a rate of 100 MHz — •Jan-Hendrik Oelmann, Janko Nauta, Alexander Ackermann, Patrick Knauer, Thomas Pfeifer, and José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Velocity-map imaging of xenon [1-3] is performed in the focus of a femtosecond enhancement cavity. The 100 MHz repetition rate of our frequency comb laser enables the detection of photoelectrons from multiphoton ionization even at very low intensity levels well below 10¹² W/cm² [4]. Because of the highly nonlinear nature of the multiphoton ionization process, electron count rates would dramatically drop at such low laser intensities. For conventional amplified femtosecond laser systems at kHz repetition rates, data acquisition time then increases to technically non-manageable levels. Our setup overcomes this limitation and extends the accessible intensity range to much lower values. Recent results and developments towards the next generation of our experimental setup to study intra-cavity near-threshold ionization and multiphoton excitation will be presented.

[1] H. Helm et al., Phys. Rev. Lett. 70(21), 3221 (1993).

[2] V. Schyja et al., Phys. Rev. A 57(5), 3692 (1998).

[2] B. Wolter, Phys. Rev. X 5(2), 21034 (2015).

[4] J. Nauta et al., in preparation.