Ultrafast spectrochronography and high-harmonic spectroscopy with ultrashort pulses in the mid-infrared
This talk will provide an overview of recent experiments performed with the use of the recently developed sources of ultrashort pulses in the mid-infrared, demonstrating new approaches in ultrafast nonlinear spectroscopy of molecular modes in the gas phase and electron wave-packet dynamics in solids. We show that the Wigner distribution function of ultrashort mid-infrared laser probes provides an informative time – frequency map that serves to reveal new, often unexpected aspects of the ultrafast optical response of complex molecular mixtures. As an application of this ultrafast spectrochronography technique, experimental studies of atmospheric air will be presented, with the Wigner maps of ultrashort mid-infrared laser probes helping identify anomalous group-velocity dispersion in atmospheric air. We will also show that below-the-bandgap high-order harmonics generated by mid-infrared ultrashort driver pulses are ideally suited to probe the intraband electron wave-packet dynamics in solids, enabling an all-optical mapping of the electron band structure in bulk solids.
Physics Department, International Laser Center, M. V. Lomonosov Moscow State University
Department of Physics and Astronomy, Texas A&M University
Russian Quantum Center
Aleksei Zheltikov is a professor at M.V. Lomonosov Moscow State University since 2000, professor at Texas A&M University since 2010, the head of Laboratory of Neurophotonics at Kurchatov Institute Russian Research Center since 2010, and the head of Advanced Photonics international laboratory at the Russian Quantum Center since 2012. He is a winner of the Russian Federation State Prize for young researchers (1997), Lamb Award for achievements in quantum electronics (2010), Shuvalov Prize for research at Moscow State University (2001), and Kurchatov Prize for achievements in neurophotonics (2014).