+++ONLINE KOLLOQUIUM+++ Multidecade nonlinear optics with ultrashort pulses in the mid-infrared (Prof. Aleksei Zheltikov)

  • Datum: 15.12.2020
  • Uhrzeit: 14:30
  • Vortragende(r): Prof. Aleksei Zheltikov
  • Physics Department, M. V. Lomonosov Moscow State University Department of Physics and Astronomy, Texas A&M University Russian Quantum Center, Moscow, Russia
  • Ort: +++ONLINE KOLLOQUIUM+++
Combined optical nonlinearity of bound and free electrons in a fast-ionizing medium driven by ultrashort, high-peak-power mid-infrared (mid-IR) pulses gives rise to a vast variety of ultrafast nonlinear-optical scenarios, producing bright and remarkably broadband radiation in spectral ranges as different as ultraviolet (UV), terahertz (THz), and microwave frequency bands. Given its enormous bandwidth, a quantitative experimental analysis of this type of nonlinear response is anything but simple.

Here, we confront this challenge by performing ultrabroad spectral measurements across the spectral range stretching from the UV to the microwave range jointly with beam-profile and radiation-pattern analysis in the THz and microwave bands along with direct time-domain field-waveform characterization based on electro-optical sampling and autocorrelation measurements. As one of the most striking results, these experiments show that the nonlinear response of a fast-ionizing gas driven by high-peak-power sub-100-fs mid-IR pulse provides a source of a bright multiband supercontinuum radiation, spanning over multiple decades, stretching from below 300 nm in the UV all the way to the subgigahertz range.

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