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Abstract <p>It was demonstrated that it is possible to perform precise femtosecond laser writing of single and ordered defects in locally thinned regions of optical fibers, so-called tunnel-type sensing elements (fiber tapers), which inherently possess high amplitude sensitivity to bending and deformation. It was shown that the controlled formation of single defects allows modulation of the transmission coefficient of the fiber waist, increasing its sensitivity to static bending deformations by 60% without compromising the mechanical strength of the waveguide. The fundamental feasibility of direct laser inscription of a system of periodic defects forming a Bragg grating directly within the fiber waist is demonstrated, opening prospects for the creation of new multiparameter fiber-optic sensors with amplitude and phase signal modulation and optimized performance characteristics.</p>

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High-Precision Femtosecond Laser Writing in Fiber-Optic Tapers

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • S. O. Gurbatov,
  • A. V. Dostovalov,
  • A. A. Kuchmizhak

摘要

Abstract

It was demonstrated that it is possible to perform precise femtosecond laser writing of single and ordered defects in locally thinned regions of optical fibers, so-called tunnel-type sensing elements (fiber tapers), which inherently possess high amplitude sensitivity to bending and deformation. It was shown that the controlled formation of single defects allows modulation of the transmission coefficient of the fiber waist, increasing its sensitivity to static bending deformations by 60% without compromising the mechanical strength of the waveguide. The fundamental feasibility of direct laser inscription of a system of periodic defects forming a Bragg grating directly within the fiber waist is demonstrated, opening prospects for the creation of new multiparameter fiber-optic sensors with amplitude and phase signal modulation and optimized performance characteristics.