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.
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.
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
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.
