High-Q Whispering-Gallery-Modes Microresonators in the Near-Ultraviolet Spectral Range

2022/11/07 by Georges Perin, Perin, Georges, Yannick Dumeige +5 · 1 citation
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Advanced Fiber Optic Sensors #FOS: Physical sciences #Optics (physics.optics) #Photonic and Optical Devices

paper · pdf · doi:10.48550/arxiv.2211.03391

openalex publication_date 2022/11/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

High-Q whispering gallery mode microresonators are cornerstones to develop compact coherent sources like single frequency lasers or frequency combs. This work reports a detailed characterization of a whispering gallery mode microsphere in the near ultraviolet. Light coupling in the resonator is obtain thanks to a robust angle-polished fiber allowing to investigate the different coupling regimes. An intrinsic Q₀-factor of 2.2 × 10⁸ and a finesse of 7.3 × 10⁴ are reported at a wavelength of 420 nm. Physical mechanisms contributing to the Q₀-factor are discussed and routes to improve the performances are drawn. Such high-Q factor and high finesse are key ingredients to ease the study of photonic devices based on WGM microresonators.

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