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Oswald Leroy
Oswald Jozef Leroy (Passendale, Belgium, 1936) is a Belgian mathematician known for his contributions to theoretical acousto-optics. Leroy's biggest achievement was a theoretical study of the interaction of light with two adjacent ultrasonic beams under different conditions in terms of beam shape, frequency content and intensity.〔Sliwinski A., "Acoustooptics and its perspectives in research and applications", ultrasonics 28(4), 195–213, 1990〕〔Poon T. C., Chatterjee M. R., Banerjee P. P., "multiple plane-wave analysis of acoustooptic diffraction by adjacent ultrasonic beams of frequency ratio 1 : ''m''", Journal of the Optical Society of America a-optics image science and vision 3(9), 1402–1406, 1986〕〔Balakshii V. I., Nagaeva I. A., "Diffraction of light by two collinear acoustic waves of different frequencies: the mode competition", Journal of Communications Technology and Electronics 45(5), 543–547, 2000〕〔Gondek G., Katkowski T., Kwiek P., "diffraction of light by two ultrasonic beams of frequency ratio 1 : 2, beyond the Raman-Nath diffraction regime", ultrasonics 38(1-8), 845–848, 2000〕 Understanding of this phenomenon was very important in the 1970s when new acousto-optic devices were developed (mainly due to novel developments in laser technology) that utilized adjacent ultrasonic beams. Such devices were being used in optical modulators,〔Pinnow D. A., IEEE J. Quant. Electr. QE-6, 223–238, 1970〕 optical scanners,〔Uchida N., Niizeki N., Proc. IEEE 61, 1073–1092, 1973〕 information processing〔Kashiwaga E., Sakurai K., in ‘Ultrasonic imaging and holography – Medical, sonar and optical applications’, Eds. G. W. Stroke, W. E. Kock, Y. Kikuchi, J. Tsujiuchi, Plenum press NY, 201–228, 1874〕〔Korbukov T. E., Kulakov S. V., Acousto-Optical methods in information processing. Mackinostroene, Leningrad, 1978〕〔Korpel A., in ‘Optical information processing’, Eds Yu E. Nesterikhin, G. W. Stroke, W. E. kock, Plenum Press, NY, 171–193, 1976〕
, optical filtering〔Chang T. C., Opt. Eng. 16, 455–460, 1977, also SPIE 90, 12–22, 1976〕 and frequency-spectrum analysis.〔Damon R. W., Maloney W. T., McMahon D. H., in ‘Physical acoustics : Principles and Methods VII’, Eds W. P. Mason and R. N. Thurston, Academic Press, NY, 273–366, 1970〕〔Hecht D. L., Opt. Eng. 16, 461–466, 1977; also in SPIE 90, 148–163, 1976〕〔Maloney W. T., IEEE Spectrum 6, 40–48, 1969〕 Before his contribution only the interaction of light with one ultrasonic beam was understood. Since then, acousto-optic devices have been used in telecommunication and military applications.
==Career==
Leroy received his PhD from Ghent University in the group of Robert A. Mertens〔( Oswald J. Leroy, Robert A. Mertens, "Theoretical Acousto-Optics in Belgium", Opt. Eng. 31(10), 2048–2061 (Oct 01, 1992). doi:10.1117/12.58876 )〕 for his thesis entitled ''Diffraction of light by ultrasound''. He worked as an assistant professor at Ghent University from 1966 to 1972 and has been a tenured professor at the Catholic University of Leuven since 1972. New developments in laser physics formed the ground for collaborations between the team of Leroy and different other laboratories. He was a guest professor at the Paris Diderot University and Université de Bordeaux, the University of Tennessee and the Tokyo Institute of Technology. Furthermore, he has collaborated with the University of Gdansk, Georgetown University, and the University of Houston. He retired in 2001 and received the title of emeritus professor.
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