Dependence of optical attenuation on radiation wavelength and waveguide geometry in copper-coated optical fibers

Pavel Cherpak,Oleg Ryabushkin,Renat Shaidullin,H Michinel,O Frazao,M.F Costa

doi:10.1051/epjconf/202023811013

Pavel Cherpak, Oleg Ryabushkin + Show 4 more

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https://doi.org/10.1051/epjconf/202023811013

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We demonstrate a novel approach to the determination of optical loss coefficients in metal-coated fibers in a 0.4-1.9 μm wavelength range. It is based on measuring the change of temperature-dependent electrical resistance of the metal coating caused by laser radiation transmitted through the fiber. A number of single-mode and multimode metallized fibers were investigated using several laser sources operating in visible and near infrared ranges. The spectral dependencies of optical losses of copper-coated fibers were experimentally obtained. The region that corresponds to the minimum optical losses is located near 1 μm wavelength. The increase of radiation losses in 1.5-1.9 μm region is much steeper compared to polymer-coated fibers.

Highlights

Nowadays metallized silica fibers are widely used types of specialty optical fibers
Several unique highpower fiber laser sources [3, 4] were constructed with the use of active optical fibers with the metal coating
A novel approach for the determination of optical loss coefficients of metallized fibers is based on the measurement of the change of temperature-dependent electrical resistance of metal coating conditioned by optical losses

Summary

Introduction

A number of sensors using for laser radiation power measurement [1] or for optical intensity profile measurement [2] were developed based on metal-coated optical waveguides. Several unique highpower fiber laser sources [3, 4] were constructed with the use of active optical fibers with the metal coating. Despite its advantages, metallized fibers have significantly higher optical losses compared to optical fibers with polymer coatings. There is lack of information in literature concerning the spectral behavior of optical losses of metal-coated fibers with different waveguide geometry. For different applications of fibers with metal coatings different parameters such as fiber geometry or source wavelength should be addressed. Accurate determination of optical loss at different wavelengths is required in order to optimize various devices based on metallized optical fibers

Measurements of optical attenuation

Laser type

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