At present, laser sources are widely used in many fields. Not only in laboratories, but also in sphere of medicine,manufacturing and military. Lasers are potentially dangerous to the eyes or sensitive optical devices, therefore it isnecessary to develop optical limiters. One of the significant properties of carbon nanotubes is their optical limitation oflaser radiation. Many works of scientific groups are devoted to materials for limiters, which include carbon nanotubes.However, they still have an increased interest. A particular role is given to such mechanism of nonlinear attenuation asscattering and absorption. Moreover, it is important not only their combined effect to increase the effectiveness of thelimiters as a whole, but also the contribution of each of them with their combined effect. It is equally important toaccurately determinate the concentration in which there is a strong attenuation of high-intensity laser radiation andminimal attenuation at low intensity. The nonlinear and linear optical properties of water-dispersed media with differentconcentrations of single-walled carbon nanotubes (SWCNTs) were obtained by optical density spectra, experimental Zscandata with an open aperture and a fixed location of the limiter. Radiation in single mode with duration of 16 ns atwavelength of 1064 nm from Nd:YAG laser was used. The linear transmittance of the prepared water dispersions of theSWCNTs ranged from 60% to 70%. Limiter with such working substances had attenuation coefficient 10 and 14 for theconcentration of nanotubes 3.125 mg/l and 6.25 mg/l, respectively.
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