Dispersive delay line based on a microcylinder Nikolay A. Aprelov, Alena Yu. Kolesnikova, Natalia A. Makarova, Alexey A. Redyuk, Ilya D. Vatnik Optics Letters, 2025 We propose a microcylinder as a highly dispersive and compact delay line. The cylindrical geometry implies a large anomalous dispersion of group velocities for the whispering gallery modes circulating at the surface of the cylinder. We demonstrate the device effectiveness in spectral measurements using the dispersive Fourier transformation approach.
Soliton-comb solutions for fiber-based bottle microresonators A. Kolesnikova, I. Vatnik, B. Sturman, E. Podivilov Optics Letters, 2025 We predict a stable generation of optical solitons and related low-repetition frequency combs in high-Q fiber-based bottle resonators of different shapes. The modal localization effect is controlled by the shaping of the fiber radius. The solitons consist of axial resonator modes, belong to a single azimuth modal number, and possess anomalously small velocities. They are remarkably similar to each other for different resonator shapes and strongly different from conventional azimuth soliton-comb states: instead of the modal dispersion, the soliton width and amplitude are controlled by the critical self-focusing power.
Modulation-instability analysis of axial-azimuthal modes in surface nanoscale axial photonic microresonators Alena Yu. Kolesnikova, Ilya D. Vatnik Physical Review A, 2024 We study the initiation of primary comb generation in surface nanoscale axial photonic (SNAP) microcavities within the framework of modulation instability theory. In such cylindrical microcavities, the whispering gallery modes exhibit different effective volumes as well as varying overlap integrals with the excitation field, which poses a challenge to the process of nonlinear mode generation. We derive the threshold power for the nonlinear generation and find it considerably diverse for modes with different sideband numbers. We also suggest special dispersion control, effectively reducing the threshold and simplifying the generation in cylindrical cavities.
Solitons in SNAP microresonator with various shape A.Yu. Kolesnikova, I.D. Vatnik 2024 International Conference Laser Optics Iclo 2024 Proceedings, 2024 We investigate the optical frequency comb generation based on axial mode interaction in a cylindrical microresonator with various shapes of effective radius variation. We argue that, regardless of the form of effective radius variation, there will be an anomalous dispersion of group velocities in the system, and therefore a soliton solution will always exist. As an example, we demonstrate the generation of an optical frequency comb in a microcavity with a rectangular radius variation.
Cylindrical microresonator-based dispersion line for dispersive Fourier transformation Nikolay А. Aprelov, Alena Y. Kolesnikova, Ilya D. Vatnik Proceedings of SPIE the International Society for Optical Engineering, 2024 We propose using a cylindrical microresonator as a highly dispersive compact delay line for the spectral measurements relying on the dispersive Fourier transformation method. The cylindrical geometry implies a large anomalous dispersion of group velocities for the whispering gallery modes propagating next to the surface of the cylinder. To prove the concept, we demonstrate the frequency-to-time mapping of an optical soliton dispersed by the microcavity made of standard telecom fiber SMF-28.
Kerr solitons generation in cylindrical microresonators Alena Y. Kolesnikova, Ilya D. Vatnik, Nikolay Aprelov, Boris I. Sturman, Evgeniy V. Podivilov Proceedings of SPIE the International Society for Optical Engineering, 2024
Theory of nonlinear whispering-gallery-mode dynamics in surface nanoscale axial photonics microresonators Alena Yu. Kolesnikova, Ilya D. Vatnik Physical Review A, 2023 We present a comprehensive model describing the Kerr nonlinear dynamics of an electric field in a cylindrical microresonator with a small effective radius variation, known as a surface nanoscale axial photonics (SNAP) device. The proposed system of equations for coupled azimuthal modes takes into account full azimuthal dispersion as well as the impact of the radiation source on the microresonator parameters. The model comprises coupling coefficients determined experimentally and appears to be a powerful tool for studying nonlinear effects, including the generation of axial-azimuthal modes and optical frequency comb generation in SNAP devices. We highlight the features of nonlinear dynamics that are specific to the SNAP platform and illustrate the power of the proposed model with optimization of the coupling point of the light source, getting two-orders-of-magnitude improvement for the nonlinear threshold.
Nonlinear threshold in cylindrical microresonators with small radius variations in the presence of a disturbing coupler Alena Kolesnikova, Ilya Vatnik Proceedings of SPIE the International Society for Optical Engineering, 2023 We present the theory of the power threshold of nonlinear effects in a cylindrical microresonator with a small effective radius variation. We demonstrate the fundamental dependence of decrements on the taper position along z. This feature makes it possible to achieve critical coupling without ultra-precise control of the distance between the microresonator and the taper. The power optimization performed in this way allows us to reduce the nonlinear threshold from tens of watts to hundreds of milliwatts.
NORBY CubeSat nanosatellite: Design challenges and the first flight data V Yu Prokopyev, S S Bakanov, V K Bodrov, E N Chernodarov, A A Doroshkin, V N Gorev, A Yu Kolesnikova, A S Kozlov, O. N. Kus, A V Melkov, A A Mitrokhin, A A Morsin, A E Nazarenko, I V Neskorodev, A V Pelemeshko, Yu M Prokopyev, D A Romanov, A M Shilov, M V Shirokih, A A Sidorchuk, A S Styuf, A M Zadorozhny Journal of Physics Conference Series, 2021
