Solution of j-type dimeric magnesium phthalocyanine complex for switches of optoelectronic medical systems and vision protection

Abstract

Phthalocyanine solutions showed strong nonlinear absorption in the case of nanosecond pulses. A different picture is observed with the incidence of femtosecond laser pulses. The attenuation of radiation in this case is mainly due to the strong nonlinear expansion of the beam with the formation of rings. A diaphragm can cut off their energy. Such solution of a dimeric J-type magnesium phthalocyanine complex in dimethylformamide can be used as a part of an optical scheme consisting of two confocal lenses and a diaphragm for optoelectronic modulation of ultrashort laser radiation (140 fs). The control laser beam can be used to adjust the amplitude of the individual pulses. These studies have shown that at laser radiation intensities in the range 0.006–1 GW/cm2, nonlinear absorption is absent, and nonlinear transmission with an increase in the radiation power (intensity) is associated only with the effects of beam expansion. In this series of experiments, in the case of nanosecond and femtosecond pulses, the values of the maximum intensity ~ 1 GW/cm2 coincided, the values of the energy of single pulses were very different ~ 300 mJ and ~ 10 nJ, respectively.
This study was supported by the Ministry of Science and Higher Education of the Russian Federation No. 075-03-2020-216 from 27.12.2019.

Speaker

Mikhail Savelyev
National Research University of Electronic Technology, MIET, I.M. Sechenov First Moscow State Medical University, Sechenov University.
Russia

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