Theoretical seminar | 25 May 2022

The presentation is devoted to high-Q optical glass microresonators with whispering gallery modes. In such resonators, broadband nonlinear optical transformations of a low-power CW pump are effectively implemented due to the action of Kerr and Raman nonlinearities, including the generation of optical frequency combs. In the case of using rare-earth ion doped samples, laser generation with controllable parameters is attained. Silica microspheres are a very convenient platform for studying non-linear processes and demonstrating new concepts because they can be easily fabricated from standard telecom optical fibers and their dispersion can be controlled by controlled diameter changes. Microspheres made of chalcogenide and tellurite glasses are also of great interest. These glasses are transparent in the mid-IR and have significantly higher nonlinearities compared to silica ones. Therefore tellurirte and chalcogenide microresonators can expand the opportunities of silica microdevices, which is also discussed.

Main paper/arXiv, related to the seminar, and other references

[1] G. Lin, A. Coillet, Y.K. Chembo, "Nonlinear photonics with high-Q whispering-gallery-mode resonators," Adv. Opt. Photon. 9, 828-890 (2017).
[2] E.A. Anashkina, A.V. Andrianov, “Kerr-Raman optical frequency combs in silica microsphere pumped near zero dispersion wavelength,” IEEE Access 9, 6729-6734 (2021).
[3] E.A. Anashkina, A.V. Andrianov, “Erbium-doped tellurite glass microlaser in C-band and L-band,” Journal of Lightwave Technology 39, 3568 - 3574 (2021).
[4] A.V. Andrianov, E.A. Anashkina, “Tunable Raman lasing in an As2S3 chalcogenide glass microsphere,” Optics Express 29, 5580-5587 (2021).