Limitation of laser radiation power by carbon materials with a nonlinear optical threshold effect at a flat-top pulse shape
Savelyev M. S. 1,2, Vasilevsky P. N. 1, Shaman Yu. P. 3, Tolbin A. Yu. 4, Gerasimenko A. Yu. 1,5, Selishchev S. V. 1
1Institute of Biomedical Systems, National Research University of Electronic Technology, MIET, Moscow, Zelenograd, Russian Federation
2 Institute for Regenerative Medicine, Sechenov First Moscow State Medical University, Sechenov University, Moscow, Russia
3 Scientific-Manufacturing Complex “Technological Centre”, Moscow, Zelenograd, Russia
4 Institute of Physiologically Active Compounds at Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
5Institute for Bionic Technologies and Engineering, Sechenov First Moscow State Medical University, Sechenov University, Moscow, Russia
Email: savelyev@bms.zone, pavelvasilevs@yandex.ru, shaman.yura@gmail.com, tolbin@inbox.ru, gerasimenko@bms.zone, selishchev@bms.zone

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The possibilities of using multivariate determination of carbon nanotubes properties based on the dependence data of the normalized transmission logarithm on the sample displacement in the case of Z-scan with an open aperture as well as on the total pulse energy in the case of fixed sample position measurements are studied. The radiation transfer equation for the threshold dependence of the absorption coefficient on the intensity of a flat-top laser beam is used. The data of physical and computational experiments showed the sensitivity of the measured curves with respect to the values of the constants of the optical and threshold energy fluence, as well as the beam waist radius. The possibility of multivariate determination of the properties of liquid carbon nanotube-based dispersed media with a nonlinear optical threshold effect and beam waist radius inside such samples has been established. Keywords: optical limiting, multivariate analysis, carbon nanotubes, Z-scan
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