Evgeny Savelyev

Background

About Evgeny Savelyev

I have been working in the field of fiber optics since 2012. In particular, I developed a method for studying the changes occurring in glasses doped with rare-earth activators by the SPCVD method during the melting stage. It was the first time in the world discovered in the presence of nanocrystals YbPO4 quartz glass with a high content of ytterbium and phosphorus manufactured SPCVD method and the correlation between the cluster size with high content of ytterbium and luminescence lifetime of Yb3+ ions. I was part of a research team that developed a unique technique for manufacturing thinned fiber light guides. They are actively used to create passive Q-switches for pulsed lasers and sensitive elements for fiber refractometers. Passive Q-switches based on fiber tapers made by chemical etching and coated with a polymer-nanopowder mixture of a saturable absorber or a saturable absorber/polymer film coated with a two-layer coating are studied. Based on them, fiber pulsed lasers with passive Q-switching operating in the range of 1.06 and 1.56 μm were developed and studied. The effect of an increase in the transmittance of passive Q-switches with an increase in the ambient temperature was discovered and explained. Since 2019 I have been developing and manufacturing fiber-optic sensors operating on the basis of the LMR (Lossy Mode Resonance) phenomenon, which is a counterpart and analogue of SPR-based fiber-optic sensors. I implemented a scheme for controlling the transmission and reflection of optical fibers inside the MOCVD reactor. This made it possible to detect the LMR during the deposition of nanoscale films of zinc chalcogenides on the lateral surface of fiber tapers, and to monitor its development in real time. Using Python, I wrote a program that allows processing a large number of spectra recorded during the deposition of films on the surface of an optical fiber and thus obtaining spectral response and transmission dependence on thickness at a specific wavelength. In the course of the conducted research, I was directly involved in the development, manufacture and characterization of fiber-optic sensors for measuring the refractive index of various aqueous solutions, including acids, alkalis, glucose and table salt. To calculate the parameters of LMR sensors, I independently learned how to use the COMSOL software, which allows to obtain the parameters of vector modes propagating in an optical fiber with high precision. Currently, I am actively working on optimizing the parameters of fiber-optic LMR-based sensors.