Development and research of a fiber-optic Fabry–Perot interferometer with an air cavity between the resonator mirrors

Konnov, D.A., Varzhel, S.V., Konnov, K.A.

For Russian citation (Opticheskii Zhurnal):

Коннов Д.А., Варжель С.В., Коннов К.А. Разработка и исследование волоконно-оптического интерферометра Фабри–Перо с воздушной полостью между зеркалами резонатора // Оптический журнал. 2025. Т. 92. № 9. С. 14–23. http://doi.org/10.17586/1023-5086-2025-92-09-14-23

Konnov D.A., Varzhel S.V., Konnov K.A. Development and research of a fiber-optic Fabry–Perot interferometer with an air cavity between the resonator mirrors [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 9. P. 14–23. http://doi.org/10.17586/1023-5086-2025-92-09-14-23

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Fiber-optic Fabry–Perot interferometer with an air cavity between the resonator mirrors. Aim of study. Development of the design of a fiber-optic Fabry–Perot interferometer with an air cavity between the resonator mirrors and its manufacturing technology, increasing the visibility of the interference pattern and the free spectral range. Method. The Fabry–Perot interferometer contains two collimating structures with resonator mirrors coaxially placed and separated along the optical axis, each of which includes a coaxially connected optical fiber and a fiber gradient lens representing a section of a multimode gradient optical fiber. The opposite polished end of the gradient lens with a reflective coating thereon forms the reflective surface of the interferometer resonator. Main results. Samples were fabricated with an interferometer base in air from 0.5 to 5 mm in 0.5 mm increments. The visibility of the interference pattern in the wavelength range from 1300 to 1310 nm was 0.989 to 0.679, and the free dispersion region lies in the range from 1.707 to 0.178 nm. Practical significance. The developed interferometer allows its use as a sensitive element of a refractometer for measuring the refractive index of gases and liquids in the range from 1 to 1.47 with a sensitivity of 190.4 pm/RIU.

Keywords:

gradient lens, refractive index gradient fiber, Fabry–Perot interferometer, interference pattern, refractive index sensor

Acknowledgements:

the research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (Project № FSER-2024-0006).

OCIS codes: 535.417.2

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Электронный ресурс URL: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=11167 (Thorlabs / Каталог оптики для микроскопии).

Electronic resource URL: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=11167 (Thorlabs / Catalog of optics for microscopy).

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