Investigation of heating of silica optical fibers with metal spiral by laser radiation transmitted in the core
Khramov I. O. 1, Ryabushkin O. A. 1
1Fryazino Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow oblast, Russia

The thermo-optical properties of passive silica optical fibers with a metal spiral applied on their lateral polymer surface are investigated. It is shown that the heating of these optical fibers by transmitted laser radiation due to microbending losses causes a change in their temperature and electrical resistance of the metal spiral. Based on this, a simple method for measuring and real-time monitoring the output power of fiber lasers is proposed. Keywords: fiber lasers, optical fibers, micro-bending losses, fibers with a metal spiral, optical power measurement. DOI: 10.61011/TPL.2023.07.56450.19601
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