Cavity Formation Modeling of Fiber Fuse in Single-Mode Optical Fibers

Shuto, Y.

doi:10.1155/2017/5728186

Cited by 5 publications

(10 citation statements)

References 66 publications

(100 reference statements)

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“…As shown in Figure 10, φ increases with increasing P 0 and gradually approaches to a constant value of about 20 µs at P 0 > 1.3 kW. This value (20 µs) is close to the φ (19 µs) observed at P 0 > 6 W in the conventional SMFs (see Figure on page 283 in [74]).…”

Section: Fiber Fuse Calculation Of Dcfssupporting

confidence: 70%

Fiber Fuse Simulation in Double-Clad Fibers for High-Power Fiber Lasers

Shuto¹

2022

JEEE

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Rare-earth-doped optical fibers are one of the most promising solid-state lasers. In these fiber lasers, a cladding-pumping scheme using double-clad fibers is utilized to increase the overall conversion efficiency of pumping light. To maintain acceptable beam quality, the low-numerical aperture large-mode-area fibers is effective for the double-clad fibers because the effects of stimulated Raman scattering can be reduced via the corresponding reduction in the power density in the large fiber core. For the large-mode-area double-clad fibers, fiber fuse propagation was investigated theoretically by the explicit finite-difference method using the thermochemical SiO x production model. In the calculation, we assumed the fiber to be in an atmosphere and that part (40 µm in length) of the core was heated to a temperature of 2,923 K. The threshold power for the double-clad fiber with the core radius of 10 µm was 1.6 W at 1.080 µm and it was close to the experimental value. The power dependence of the velocity of fiber fuse propagation was calculated for the double-clad fibers with the core radius of 10 and 15 µm. The calculated velocities were in fair agreement with the experimental values observed in the input power range from 1 kW to 3.5 kW at 1.080 µm.

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Section: Fiber Fuse Calculation Of Dcfssupporting

confidence: 70%

Fiber Fuse Simulation in Double-Clad Fibers for High-Power Fiber Lasers

Shuto¹

2022

JEEE

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“…The irradiated heating area near the bottom surface is considered to be thermodynamically unstable owing to the large increment (≥ 5,000 K) of the local temperature. As described in [46], thermodynamic instability results in a decrease in the l / Λ value of the cavity. From the experimental results with respect to the l / Λ values described above, it can be considered that the cavity formation process in the self-guided filament is thermodynamically unstable and the instability of the process increases with increasing the pulse energy of a focused fs laser beam.…”

Section: Irradiated By Ultrashort Laser Pulsesmentioning

confidence: 93%

Electron Density Estimation and Fiber Fuse Simulation in Laser-Irradiated Bulk Glass

Shuto¹

2022

JEEE

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To clarify the formation mechanism of periodic nanometer-size cavity structure of a borosilicate glass sample, the free electron density around the exit surface was investigated when it exposed to intense femtosecond laser radiation. The electron density near the edge of the crack on the surface was estimated to be 10 20 -10 22 cm -3 . From this result, the temperature of the irradiated heating area near the edge of the crack was estimated to reach at least about 6,000 K, which was sufficient for the initiation and propagation of the fiber fuse. In this way, periodic nanosized cavities could be formed by fiber fuse propagation starting near the edge of the crack on the exit surface. Next, fiber fuse propagation in the modified zone formed by continuous-wave laser irradiation in a silica glass sample was investigated theoretically by the explicit finite-difference method using the thermochemical SiO x production model. In the calculation, we assumed the glass to be in an atmosphere and that part (40 µm in length) of the modified zone was heated to a temperature of 2,923 K. The calculated velocities of fiber fuse propagation in the modified zone were in fair agreement with the experimental values observed at 0.514 and 1.064 µm.

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“…The mechanism of the optical breakdown initiation in a fiber light guide is closely related to the nonlinear absorption of quartz glass [6][7][8]. If the power density is sufficient to sustain the optical breakdown, the resulting plasma focus flares up and begins to propagate along the fiber core [9,10]. The works of Y. Shuto [7][8][9]11] studied the phenomenon of the fuse effect, leading to the destruction of optical fibers under the influence of high-power laser pulses.…”

Section: Introductionmentioning

confidence: 99%

“…Algorithms 2023, 16, x FOR PEER REVIEW 2 of 20 sufficient to sustain the optical breakdown, the resulting plasma focus flares up and begins to propagate along the fiber core [9,10]. The works of Y. Shuto [7][8][9]11] studied the phenomenon of the fuse effect, leading to the destruction of optical fibers under the influence of high-power laser pulses.…”

Section: Introductionmentioning

confidence: 99%

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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Cavity Formation Modeling of Fiber Fuse in Single-Mode Optical Fibers

Cited by 5 publications

References 66 publications

Fiber Fuse Simulation in Double-Clad Fibers for High-Power Fiber Lasers

Fiber Fuse Simulation in Double-Clad Fibers for High-Power Fiber Lasers

Electron Density Estimation and Fiber Fuse Simulation in Laser-Irradiated Bulk Glass

Mathematical Model of Fuse Effect Initiation in Fiber Core

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