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17 March 2023 Anomalous resonance shifts, distance calibration, and lasing in WGM resonators
Farhan Azeem, Josh Christensen, Luke S. Trainor, Nicholas Lambert, Dmitry Strekalov, Harald G. L. Schwefel
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Proceedings Volume PC12407, Laser Resonators, Microresonators, and Beam Control XXV; PC1240703 (2023) https://doi.org/10.1117/12.2657200
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
Dielectric whispering-gallery-mode (WGM) resonators can confine light via total internal reflection. Small perturbations in the local environment usually lead to a frequency shift of the resonator modes directly proportional to the polarizability of the perturbation. Here, we report experimental observations and a theoretical model of strong frequency shifts that can be opposite and even exceed the contribution of the perturbations' polarizability [1]. We also report on a new, independent way of calibrating the prism distance based on Newton’s rings [2] and report on results from ultra-low threshold lasing from a titanium doped sapphire WGM resonator, showing that lasing as well as linewidth narrowing is possible [3]. [1] F. Azeem, …, and H.G.L. Schwefel, Opt. Lett. 46, 2477(2021). [2] J. T. Christensen, …, and H. G. L. Schwefel, arXiv:2208.00667(2022). [3] F. Azeem, …, and H.G.L. Schwefel, Adv. Optical Materials 10, 2102137(2022).
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Farhan Azeem, Josh Christensen, Luke S. Trainor, Nicholas Lambert, Dmitry Strekalov, and Harald G. L. Schwefel "Anomalous resonance shifts, distance calibration, and lasing in WGM resonators", Proc. SPIE PC12407, Laser Resonators, Microresonators, and Beam Control XXV, PC1240703 (17 March 2023); https://doi.org/10.1117/12.2657200
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KEYWORDS
Resonators
Calibration
Polarizability
Dielectrics
Prisms
Sapphire
Titanium
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