Focused optical and acoustic beams in media with nonlinear absorption

O. V. Rudenko; A. A. Sukhorukov

doi:10.1117/12.257385

8 November 1996 Focused optical and acoustic beams in media with nonlinear absorption

O. V. Rudenko, A. A. Sukhorukov

Proceedings Volume 2965, ALT '96 International Symposium on Laser Methods for Biomedical Applications; (1996) https://doi.org/10.1117/12.257385
Event: ALT '96 International Symposium: Laser Methods for Biomedical Applications, 1996, Heraklion, Crete, Greece

Abstract

Optical and acoustic beams are known to be useful for medical and biological applications, such as diagnostics, surgery, etc. At high intensities both nonlinear lens effects and nonlinear absorption can be significant for the beams. The nonlinear absorption arises due to two-photon optical processes or acoustic shock wave formation. The present work is devoted to the theoretical description of nonlinear beam propagation and focal spot formation taking into account the competition between focusing, diffraction and absorption. We derived a new nonlinear integro- differential equation describing the spatial evolution of the beam width. The general analytical solution of this equation is obtained for arbitrary boundary conditions. The simple formulas are derived for the angle divergence in the far field, as well as for beam width at nonlinear waist. The results of the analysis of these key parameters in different situations are presented.

Citation Download Citation

O. V. Rudenko and A. A. Sukhorukov "Focused optical and acoustic beams in media with nonlinear absorption", Proc. SPIE 2965, ALT '96 International Symposium on Laser Methods for Biomedical Applications, (8 November 1996); https://doi.org/10.1117/12.257385

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