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31 October 1994 Dynamic gratings on solid surface arising from waveguide mode generation by laser radiation (Abstract Only)
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Proceedings Volume 1991, Diffractometry and Scatterometry; (1994) https://doi.org/10.1117/12.192039
Event: International Conference on Diffractometry and Scatterometry, 1994, Warszawa, Poland
Abstract
Efficient generation ofwaveguide modes and exponential increaseof optically induced gratings can take place under the scattering of laser radiation on a rough surface of semiconductor or insulator. In this paper, the following non-stationary self-consistent problem is considered. Laser radiation generates waveguide modes and interferes with them. Arising interference, thermal source results in thermoelastic deformation determining the amplitude of waveguide modes. Analytical expression for the coefficient of laser radiation transformation into waveguide mode is obtained. An analytical solution for the evolution of dynamic gratings and temperature fields is found. An analysis for this solution shows that the average surface temperature turns out to be constant for large times. The periodical temperature profile and dynamic grating either increase or decrease exponentially depending on relation between the space frequency of initial surface roughness and the threshold frequency determined by the parameters of the solid and laser radiation intensity.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. A. Shiryaev "Dynamic gratings on solid surface arising from waveguide mode generation by laser radiation (Abstract Only)", Proc. SPIE 1991, Diffractometry and Scatterometry, (31 October 1994); https://doi.org/10.1117/12.192039
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