Determination of a refractive index distribution along a SNAP microresonator from its single spectrum: temperature distribution measurement

Gabriella Gardosi; Brian J. Mangan; Misha Sumetsky

doi:10.1117/12.3009970

13 March 2024 Determination of a refractive index distribution along a SNAP microresonator from its single spectrum: temperature distribution measurement

Gabriella Gardosi, Brian J. Mangan, Misha Sumetsky

Author Affiliations +

Proceedings Volume PC12871, Laser Resonators, Microresonators, and Beam Control XXVI; PC128710K (2024) https://doi.org/10.1117/12.3009970
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We show, both theoretically and experimentally, that it is possible to determine a nonuniform temperature distribution along a SNAP microresonator from a single measurement of its spectrum. In our experiment, we use a silica microcapillary containing a SNAP microresonator. The microcapillary is filled with water and locally heated with a moving heating source (light-pumped microfiber) introducing the temperature distribution parameterized as T(z)=T_0 exp(-|z-z_Q+iw|/L), where z is the coordinate along the microcapillary axis, z_Q is the heating source position, and w≪L is the width of the source. At each heating source position z_Q, we restore the parameters of this distribution from the SNAP microresonator spectrum. Our theoretical calculations are in a good agreement with the experimental data.

Conference Presentation

Citation Download Citation

Gabriella Gardosi, Brian J. Mangan, and Misha Sumetsky "Determination of a refractive index distribution along a SNAP microresonator from its single spectrum: temperature distribution measurement", Proc. SPIE PC12871, Laser Resonators, Microresonators, and Beam Control XXVI, PC128710K (13 March 2024); https://doi.org/10.1117/12.3009970

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