Metal-coated Bragg grating reflecting fibre

Chamorovskiy, Yuri K.; Butov, Oleg V.; Kolosovskiy, A.O.; Попов, С. М.; Voloshin, V. V.; Vorob'ev, Igor' L; Vyatkin, M. Y.

doi:10.1016/j.yofte.2016.12.008

Cited by 16 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The solution to the problem was the development of special OFs with extended FBG arrays, which are inscribed directly during the process of extracting the OF with UV radiation [9][10][11][12][13][14][15]. FBGs are inscribed in such an optical fiber using pulsed radiation from an excimer UV laser and a phase mask.…”

Section: Introductionmentioning

confidence: 99%

High Efficient Random Laser with Cavity Based on the Erbium-Doped Germanophosphosilicate Artificial Rayleigh Fiber

et al. 2023

View full text Add to dashboard Cite

The Erbium “random” laser, based on the artificial Rayleigh fiber, has been comparatively studied in detail under two different pump conditions: 974.5 and 1485 nm pumping wavelengths. The artificial Rayleigh 7-m-long fiber was used as a laser cavity, it was formed by the ultraviolet (UV) inscription of the uniform array of the weakly reflective fiber Bragg grating (FBG) during the fiber drawing process. The UV photosensitivity of the Erbium-doped fiber originated from the specially developed (germanophosphosilicate) core glass composition. The emission spectrum of the fabricated “random” fiber laser had a single narrow peak at the 1548 nm wavelength. It was clearly revealed that the extension of the laser cavity by the separate wavelength-matched 90%-reflective FBG resulted in a significant laser efficiency growth. The highest laser slope efficiency of 33% and the laser output power of 80 mW were reached in the FBG-modified cavity at the 974.5-nm-wavelength pumping. The continuous-wave operation mode of this laser has been confirmed. The laser linewidth value measured by the delayed self-heterodyne technique was about 550 Hz.

show abstract

Section: Introductionmentioning

confidence: 99%

High Efficient Random Laser with Cavity Based on the Erbium-Doped Germanophosphosilicate Artificial Rayleigh Fiber

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Several studies assess the temperature measurement performances of various fibers at high temperatures by using OFDR. Chamorovskiy et al and Popov et al demonstrate the possibility to make OFDR measurements at 600 °C on aluminum-coated fibers with arrays of fiber Bragg gratings [ 26 , 27 ] (the Rayleigh signal enhancement along the heated fiber Bragg gratings is 30 dB). In studies of Yan et al and Wang et al, thermally treated nanograting-based distributed fiber sensor allow a stable temperature measurement along the fiber with the heat-treated nanograting at 600 °C in a nuclear reactor, at 800 °C in a solid oxide fuel cell, or even at 1000 °C for optimized fibers [ 7 , 12 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Study of a Zirconia-Doped Fiber for Distributed Temperature Sensing by OFDR at 800 °C

Bulot

Bernard

Cieslikiewicz-Bouet

et al. 2021

Sensors

View full text Add to dashboard Cite

Optical Frequency Domain Reflectometry (OFDR) is used to make temperature distributed sensing measurements along a fiber by exploiting Rayleigh backscattering. This technique presents high spatial and high temperature resolutions on temperature ranges of several hundred of degrees Celsius. With standard telecommunications fibers, measurement errors coming from the correlation between a high temperature Rayleigh trace and the one taken as a reference at room temperature could be present at extremely high temperatures. These correlation errors, due to low backscattering signal amplitude and unstable backscattering signal, induce temperature measurement errors. Thus, for high temperature measurement ranges and at extremely high temperatures (e.g., at 800 °C), a known solution is to use fibers with femtosecond laser inscribed nanograting. These fs-laser-insolated fibers have a high amplitude and thermally stable scattering signal, and they exhibit lower correlation errors. In this article, temperature sensing at 800 °C is reported by using an annealed zirconia-doped optical fiber with an initial 40.5-dB enhanced scattering signal. The zirconia-doped fiber presents initially OFDR losses of 2.8 dB/m and low OFDR signal drift at 800 °C. The ZrO2-doped fiber is an alternative to nanograting-inscribed fiber to make OFDR distributed fiber sensing on several meters with gauge lengths of 1 cm at high temperatures.

show abstract

“…Depositing a metal coating on the FBGs prior to processing them for annealing offers an effective solution to provide them with the necessary mechanical strengthening. Moreover, the metal coating is also effective in increasing the temperature sensitivity of the regenerated FBG, which is useful if its use is intended for HT sensing [11,12,13,14,15]. Following these considerations, we tried to identify the most suitable metal for FBG coating starting from the most common and easily electrodeposited metals with a high melting temperature, such as copper (Cu) and nickel (Ni).…”

Section: Introductionmentioning

confidence: 99%

Critical Issues of Double-Metal Layer Coating on FBG for Applications at High Temperatures

Lupi

Felli

Dell’Era

et al. 2019

Sensors

View full text Add to dashboard Cite

Use of fiber Bragg gratings (FBGs) to monitor high temperature (HT) applications is of great interest to the research community. Standard commercial FBGs can operate up to 600 ∘ C. For applications beyond that value, specific processing of the FBGs must be adopted to allow the grating not to deteriorate. The most common technique used to process FBGs for HT applications is the regeneration procedure (RP), which typically extends their use up to 1000 ∘ C. RP involves a long-term annealing of the FBGs, to be done at a temperature ranging from 550 to 950 ∘ C. As at that temperature, the original coating of the FBGs would burn out, they shall stay uncoated, and their brittleness is a serious concern to deal with. Depositing a metal coating on the FBGs prior to process them for RP offers an effective solution to provide them with the necessary mechanical strengthening. In this paper, a procedure to provide the FBG with a bimetallic coating made by copper and nickel electrodeposition (ED) is proposed, discussing issues related to the coating morphology, adherence to the fiber, and effects on the grating spectral response. To define the processing parameters of the proposed procedure, production tests were performed on dummy samples which were used for destructive SEM–EDS analysis. As a critical step, the proposed procedure was shown to necessitate a heat treatment after the nickel ED, to remove the absorbed hydrogen. The spectral response of the FBG samples was monitored along the various steps of the proposed procedure and, as a final proof test for adherence stability of the bimetallic coating, along a heating/cooling cycle from room temperature to 1010 ∘ C. The results suggest that, given the emergence of Kirkendall voids at the copper–nickel interface, occurring at the highest temperatures (700–1010 ∘ C), the bimetallic layer could be employed as FBG coating up to 700 ∘ C.

show abstract

Metal-coated Bragg grating reflecting fibre

Cited by 16 publications

References 12 publications

High Efficient Random Laser with Cavity Based on the Erbium-Doped Germanophosphosilicate Artificial Rayleigh Fiber

High Efficient Random Laser with Cavity Based on the Erbium-Doped Germanophosphosilicate Artificial Rayleigh Fiber

Performance Study of a Zirconia-Doped Fiber for Distributed Temperature Sensing by OFDR at 800 °C

Critical Issues of Double-Metal Layer Coating on FBG for Applications at High Temperatures

Contact Info

Product

Resources

About