Emil Wolf
Emil Wolf (July 30, 1922 – June 2, 2018)[1] was a Czech-born American physicist who made advancements in physical optics, including diffraction, coherence properties of optical fields, spectroscopy of partially coherent radiation, and the theory of direct scattering and inverse scattering.[3] After brief periods in Italy and France (where he worked for the Czech government in exile), he moved to the United Kingdom in 1940.Technically, he found that two non-Lambertian sources that emit beamed energy, can interact in a way that causes a shift in the spectral lines.A subsequent 1999 article by Sisir Roy et al. have suggested that the Wolf effect may explain discordant redshift in certain quasars.[7] He also authored Introduction to the Theory of Coherence and Polarization of Light and Selected Works of Emil Wolf with Commentary (World Scientific Publishing, 2001, ISBN 981-281-187-7).