Structural characteristics of internal microcavities produced in optical fiber via the fuse effect

Konin, Yuri A.; Scherbakova, Victoria A.; Bulatov, M. I.; Malkov, Nikita A.; Lucenko, A. S.; Starikov, Sergey S.; Grachev, N.A.; Perminov, A. V.; Petrov, Andrey A.

doi:10.1364/jot.88.000672

Cited by 4 publications

(3 citation statements)

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“…Experiments show that the size of the plasma spark moving along the fiber and the defects resulting from this motion do not exceed the size of the fiber core [18]. This circumstance suggests that optical breakdown, as a process of the plasma spark motion, begins at the moment when the temperature front of the plasma formation reaches the coreshell S12 boundary.…”

Section: Resultsmentioning

confidence: 96%

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Mathematical Model of Fuse Effect Initiation in Fiber Core

et al. 2023

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This work focuses on the methods of creating in-fiber devices, such as sensors, filters, and scatterers, using the fiber fuse effect. The effect allows for the creation of structures in a fiber core. However, it is necessary to know exactly how this process works, when the plasma spark occurs, what size it reaches, and how it depends on external parameters such as power and wavelength of radiation. Thus, this present study aims to create the possibility of predicting the consequences of optical breakdown. This paper describes a mathematical model of the optical breakdown initiation in a fiber core based on the thermal conductivity equation. The breakdown generates a plasma spark, which subsequently moves along the fiber. The problem is solved in the axisymmetric formulation. The computational domain consists of four elements with different thermophysical properties at the boundaries of which conjugation conditions are fulfilled. The term describing the heat source in the model is determined by the wavelength of radiation and the refractive indices of the core and the shell and also includes the radiation absorption on the released electrons during the thermal ionization of the quartz glass. The temperature field distributions in the optical fiber are obtained. Based on the calculations, it is possible to estimate the occurrence times of various phase states inside the fiber, in particular, the plasma spark occurrence time.

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Section: Resultsmentioning

confidence: 96%

“…As mentioned above, these structures can be used as a sensing element for a fiber optic sensor based on a Fabry-Perot interferometer or a fiber optic radiation scatterer [16,17]. For different sensors and optical radiation scatterers, there are different requirements for the geometrical parameters of the internal structure [18,19].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model of Fuse Effect Initiation in Fiber Core

et al. 2023

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“…To create micro-cavities inside the optical fiber, optical radiation from a laser (YFL-1100) with an optical power of 2 W and a wavelength of 1080 nm is used. Plasma heating is initiated by putting the end face of the optical fiber into contact with a darkened surface; for example, with black-colored ABS plastic [40]. A plasma cluster forms on the end face of the fiber, which moves back along the core, creating micro cavities.…”

Section: Open Cavity Formation At the End Face Of An Optical Fibermentioning

confidence: 99%

Fiber-Optic Hydraulic Sensor Based on an End-Face Fabry–Perot Interferometer with an Open Cavity

Morozov,

Agliullin,

Sakhabutdinov

et al. 2023

Photonics

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The paper describes the design and manufacturing process of a fiber optic microphone based on a macro cavity at the end face of an optical fiber. The study explores the step-by-step fabrication of a droplet-shaped macro cavity on the optical fiber’s end surface, derived from the formation of a quasi-periodic array of micro-cavities due to the fuse effect. Immersing the end face of an optical fiber with a macro cavity in liquid leads to the formation of a closed area of gas where interfacial surfaces act as Fabry–Perot mirrors. The study demonstrates that the macro cavity can act as a standard foundational element for diverse fiber optic sensors, using the droplet-shaped end-face cavity as a primary sensor element. An evaluation of the macro cavity interferometer’s sensitivity to length alterations is presented, highlighting its substantial promise for use in precise fiber optic measurements. However, potential limitations and further research directions include investigating the influence of external factors on microphone sensitivity and long-term stability. This approach not only significantly contributes to optical measurement techniques but also underscores the necessity for the continued exploration of the parameters influencing device performance.

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