Maksim Melnik

Maksim Melnik
ITMO University | SPbNRU ITMO · Department of Photonics and Optical Information Technology

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12
Publications
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77
Citations

Publications

Publications (12)
Conference Paper
A detailed analysis of the applicability limits the z-scan method exhibit when employed for THz radiation is conducted. THz pulses feature critically wide spectrum and ultrashort duration, which leads to a significant decrease in the accuracy of the results obtained by z-scan method. The work presents the estimations of the z-scan method accuracy o...
Article
The nonlinear response of liquids in the terahertz regime has recently attracted significant interest, even though very few measurements have been reported. Here, we report on our measurements based on a z-scan technique of the nonlinear refractive-index coefficient n2 at terahertz frequencies for several liquids with noncentrosymmetric molecules,...
Article
Full-text available
Despite the growing interest in nonlinear devices and components for light by light control in the terahertz range, there is a shortage of such materials and media used for these purposes. Here, we present the calculated values of low-inertia nonlinear refractive index coefficient for electro-optical crystals used in THz time-domain spectroscopy sy...
Article
Full-text available
The values of the nonlinear refractive index coefficient for various materials in the terahertz frequency range exceed the ones in both visible and NIR ranges by several orders of magnitude. This allows to create nonlinear switches, modulators, systems requiring lower control energies in the terahertz frequency range. We report the direct measureme...
Preprint
Full-text available
The values of the nonlinear refractive index coefficient for various materials in the terahertz frequency range exceed the ones in both visible and NIR ranges by several orders of magnitude. We report the direct measurement of the nonlinear refractive index coefficient of liquid water by using the Z-scan method with broadband pulsed THz beam. Our e...
Article
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A modification of the Z-scan technique for measuring nonlinear refractive index n2 in the terahertz spectral region is proposed. Measurements are made at a broadband terahertz radiation intensity of 0.8 × 10⁹ W cm⁻². Coefficient n2 = 2.5 × 10⁻¹¹ cm² W⁻¹ is estimated for semiconductor crystalline ZnSe.
Article
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We used a numerical simulation to calculate the coherence time of the spectral supercontinuum generated in a microstructured fiber in which the group velocity dispersion as a function of wavelength and pump pulse width has two zeros. We determined the contribution to the total coherence time from each of the separate substructures in the resulting...
Article
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In this paper, we demonstrate experimentally for the first time (to our knowledge) the generation of spectral supercontinuum (SC) of more than two octaves with high intensity in a water jet. The spectrum of the generated SC extends from 350 to 1400 nm, with intensities up to 10¹¹ W/cm², and its generation efficiency is more than 50%. For the pump i...
Article
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We present a mathematical model of linear and nonlinear processes that takes place under the action of femtosecond laser radiation on the cutaneous covering. The study is carried out and the analytical solution of the set of equations describing the dynamics of the electron and atomic subsystems and investigated the processes of linear and nonlinea...
Conference Paper
Full-text available
In this paper the dependence of the coherence time of a femtosecond spectral supercontinuum from different initial pulse parameters - wavelength, peak intensity and duration is studied. The obtained dependences and ratio of the coherence time of the pulse to the duration of the pulse at the output are analyzed. It is shown that in the case of femto...

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Projects

Projects (3)
Project
The main goal of the project is the creation and expansion of quantum models of quantum optics elements in and their application in the basic protocols of quantum communications and quantum informatics, including for the analysis of the information resources of the quantum states they form, analysis of the quantum dynamics of multimode photonic systems as a result of their interaction with various elements, as well as their experimental confirmation.