Immanuil Lazarevich Fabelinsky (born 27.01.1911) Soviet physicist, a corresponding member of the USSR Academy of Sciences (1979). Born in the town of Grajewo (now in the Białystok Region). Graduated from Moscow University (1936). In 1936 — 41 he worked at Moscow University, and from 1943 he was head of a sector at the Physical Institute of the USSR Academy of Sciences.
His research was in the fields of physical optics, nonlinear optics and molecular acoustics. He discovered stimulated scattering in the wing of the Rayleigh line, stimulated entropy (temperature) scattering of light, the splitting of the line of stimulated scattering caused by the interaction of acoustic waves with the modes of orientational motion of the molecules of the medium, stimulated Mandelstam—Brillouin scattering in gases, supercooled liquids and glasses, and powerful long-wavelength infrared radiation in quartz at helium temperatures. He studied the process of the breakdown of transparent dielectrics by intense light and the kinetics of this phenomenon. He detected the dispersion of the speed of sound in liquids, the fine structure of the spectrum of depolarised light scattering, and the narrowing of the spectrum of depolarised Rayleigh and Raman scattering of light in the region of the critical point of phase separation of solutions. He established the laws governing the propagation of ultrasound and hypersound in viscous media.
M. V. Lomonosov Prize (1966).