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13 March 2024 Sub-picometer precise tuneability of the free spectral range of a parabolic microresonator
Manuel Crespo-Ballesteros, Misha Sumetsky
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Proceedings Volume PC12871, Laser Resonators, Microresonators, and Beam Control XXVI; PC128710D (2024) https://doi.org/10.1117/12.3008438
Event: SPIE LASE, 2024, San Francisco, California, United States
Abstract
Commonly, the spectra of high Q-factor microresonators are fixed or only weakly tunable, which limits their versatility. To address this limitation, we demonstrate continuous tunability of the axial Free Spectral Range (FSR) of parabolic microresonators created by bending a 125 μm radius optical fiber segment. By controlling the bent fiber profile with linear stages affixed to its ends, we vary its FSR between 1.9 pm and 2.7 pm for more than 65 equally spaced eigenmodes. We show that the FSR tunability can be achieved with precision better than 0.2 pm. The demonstrated tunability, together with the inherently small FSR of our parabolic microresonators, unlock their potential applications including optical frequency comb generation and frequency conversion.
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Manuel Crespo-Ballesteros and Misha Sumetsky "Sub-picometer precise tuneability of the free spectral range of a parabolic microresonator", Proc. SPIE PC12871, Laser Resonators, Microresonators, and Beam Control XXVI, PC128710D (13 March 2024); https://doi.org/10.1117/12.3008438
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KEYWORDS
Microresonators
Optical fibers
Frequency combs
Frequency conversion
Lithium
Optical limiting
Photonics
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