Sergey Aleksandrovich Tikhomirov (b. 28.07.1953, v. Provedeniye, Chukotka district, Khabarovsk Territory, Russia) - a scientist in the field of molecular spectroscopy, nonlinear optics and laser physics. Corresponding Member (2014), Doctor of Physico-Mathematical Sciences (2001).
Scientific works in the field of ultrafast kinetic spectroscopy and photophysics. He made a significant contribution to the development and creation of original laser systems emitting pico- and femtosecond pulses. Based on the development of methods for ultrafast spectroscopy, he carried out system studies of a number of fast photophysical and photochemical processes in complex molecules, biologically important compounds, semiconductor and plasmon nano-sized structures and other atomic-molecular systems. Established the dynamics and mechanisms of molecular bond dissociation and reverse geminal recombination for a number of biologically important compounds and model systems of practical interest when searching for new compounds with an increased quantum yield of active particles. Received the generation of stimulated emission by radicals of organic compounds, which opened the possibility of creating photochemical lasers with optical pumping on the basis of free radicals of organic compounds. He discovered and explained the formation of anomalously wideband amplification spectral contours during stimulated Raman scattering in a crystalline medium excited by femtosecond pulses. He established the physical mechanisms underlying the complex time kinetics of the nonlinear-optical response to the excitation by femtosecond pulses of various nanocomposite structures, and implemented on this base a number of promising fast-switching optical devices. Received a highly stable generation of femtosecond pulses under pulsed pumping conditions and the use of new solid-state passive gates on quantum dots and created on this basis a powerful compact femtosecond laser system. He proposed a laser-optical method for the formation of subpicosecond time marks of the interaction of ionizing radiation with crystalline scintillation materials.
Author of more than 300 scientific papers, including 2 monographs, 6 copyright certificates.
Prize of the National Academy of Sciences of Belarus (2015) for the series of works “Investigation of the dynamics and mechanisms of fast photophysical and photochemical processes in complex atomic-molecular systems based on the development and application of methods of ultrahigh kinetic spectroscopy”.