Enhanced photosensitivity in silicate optical fibers by thermal treatment

Brambilla, Gilberto; Pruneri, Valerio

doi:10.1063/1.2714096

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…Silica-based glass has been the subject of intense investigations due to the wide variety of applications of this material: − it showed excellent chemical stability, good mechanical properties, easy preparation processes, and doping and shaping possibilities. Indeed, silica glass recently attracted interest because it turned out to be suitable for flexible fiber-based technologies, − opening its application perspectives in the sensor, − laser, , and space fields , as a powerful tool for innovative designs.…”

Section: Introductionmentioning

confidence: 99%

Trapping Mechanisms and Delayed Recombination Processes in Scintillating Ce-Doped Sol–Gel Silica Fibers

et al. 2021

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The carrier trapping and recombination mechanisms occurring in Ce-doped silica fibers, produced by a sol−gel technique, are investigated by combining temperature-dependent steady-state X-ray-excited luminescence, wavelength-and timeresolved scintillation measurements, and wavelength-resolved thermally stimulated luminescence, focusing especially on the temperature range from 10 to 320 K. The scintillation decay features a decay time of the order of tens of nanoseconds, characteristic of the parity-and spin-allowed 5d−4f radiative transition of Ce 3+ ions. In addition, a slow and complex decay contribution in the microsecond timescale is detected. We interpret these features as due to the radiative recombination at Ce centers of carriers freed from a continuous distribution of trapping sites in the forbidden gap as well as to the occurrence of an athermal tunneling recombination process between traps and Ce 3+ ions. This interpretation is reinforced by good agreement between independent evaluations of trap depths and lifetimes obtained by both the numerical analysis of scintillation time decays and thermally stimulated luminescence experiments.

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Section: Introductionmentioning

confidence: 99%

Trapping Mechanisms and Delayed Recombination Processes in Scintillating Ce-Doped Sol–Gel Silica Fibers

et al. 2021

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“…Meanwhile, a pure quartz fiber has a different ξ of 6.67 × 10 −6 [ 14 ]. On a related note, because of the differences among different fibers—including differences in the ways that fiber gratings are etched and annealed [ 15 , 16 ]—the performances of different FBG sensors in terms of temperature sensitivity can be very different. In this study, we determined the high temperature decay mechanisms of FBGs surrounded by nitrogen gas in the context of the gas nitriding process, and measured the Bragg wavelength shift and temperature sensitivity of these FBGs.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Thermodiffusion of an FBG Sensor in the Gas Nitriding Process

2016

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In this paper, we report the numerical calculations for a thermo-optical model and the temperature sensitivity of a fiber Bragg grating (FBG) sensor. The thermally-induced behaviors of a FBG sensor in the gas nitriding process were analyzed for temperatures ranging from 100–650 °C. The FBG consisted of properly chosen photosensitive fiber materials with an optimized thermo-optic coefficient. The experimental and optimized thermo-optic coefficient results were consistent in terms of temperature sensitivity. In these experiments, the temperature sensitivity of the FBG was found to be 11.9 pm/°C.

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“…The photosensitivity enhancement in germanosilicate fibers is associated with germanium-oxygen deficient centers (GODC) whose concentration in the fiber structure depends on competing reactions, namely, the creation of GODCs and their destruction that would produce other defects in the glass network [8]. A temperature increase would shift the balance of the reactions to generate and destroy GODCs [9], which are also responsible for the absorption bands in the UV, at wavelengths used to imprint FBG, for example, at 242nm. A higher absorption in the UV band would imply a change in the refractive index values at longer wavelengths, according to the Kramers-Kronig relations [1], causing the production of the refractive index modulation and therefore the fiber Bragg grating.…”

Section: Introductionmentioning

confidence: 99%

Automated photosensitivity enhancement in optical fiber tapers

Paterno

Oliveira

Kalinowski

2011

J. Microw. Optoelectron. Electromagn. Appl.

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An alternative technique that uses a flame-brush at high temperature to enhance UV light photosensitivity in an optical fiber is described. An extreme low-cost air aspirated propane-butane mini-torch is used, which produces a lower temperature flame than the one in the flame-brush original technique. It is shown that this change in the previous technique is also capable of improving photosensitivity and allowing the fiber Bragg grating imprinting process to be accelerated. Since the flame-brush photosensitivity enhancement process is designed to operate in an automated fiber taper rig, the process was evaluated in optical fiber tapers with different diameters. In this case, changes in photosensitivity are observed in the tapers in addition to the intrinsic photosensitivity occurring in the pristine fiber without being tapered.

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Enhanced photosensitivity in silicate optical fibers by thermal treatment

Cited by 7 publications

References 22 publications

Trapping Mechanisms and Delayed Recombination Processes in Scintillating Ce-Doped Sol–Gel Silica Fibers

Trapping Mechanisms and Delayed Recombination Processes in Scintillating Ce-Doped Sol–Gel Silica Fibers

Analysis and Optimization of Thermodiffusion of an FBG Sensor in the Gas Nitriding Process

Automated photosensitivity enhancement in optical fiber tapers

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