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20 February 2015Self-action of continuous laser radiation in a water suspension with light-absorbing particles
Water suspension of light-absorbing nano-sized particles is an example of a medium in which non-linear effects are present at moderate light intensities favorable for optical treatment of organic and biological objects. We study experimentally the phenomena emerging in a thin layer of such a medium under the action of inhomogeneous light field formed due to the Pearcey diffraction pattern near a microlens focus. In this high-gradient field, the light energy absorbed by the particles induces inhomogeneous distribution of the medium refraction index, which results in observable self-diffraction of the incident light, here being strongly sensitive to the medium position with respect to the focus.
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O. V. Angelsky, P. P. Maksimyak, A. P. Maksimyak, C. Yu. Zenkova, "Self-action of continuous laser radiation in a water suspension with light-absorbing particles," Proc. SPIE 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII, 92581M (20 February 2015); https://doi.org/10.1117/12.2070221