Fabrication and Gamma-Ray Irradiation Effect on Optical and Mechanical Properties of Germano-Silicate Glass Fibers with Inner Cladding of B and F Doped Silica Glasses

Ju, Seongmin; Watekar, Pramod R.; Ryu, Yong-Tak; Lee, Y.; Kang, Sung Gwon; Kim, Y.; Linganna, K.; Han, Won‐Taek

doi:10.1080/01468030.2019.1598520

Cited by 8 publications

(6 citation statements)

References 34 publications

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“…In Figure 5B, after γ‐ray irradiation, the RD effects in undoped BGG glass samples can be observed, which introduces a broad and intense additional absorption band from 320 to 700 nm in the BGG glass. As confirmed before, the RD effects came from the formation of Ge‐related color centers defects after γ‐ray irradiation 21,53 . Two kinds of γ‐ray‐induced defects of Ge‐related electron center (GEC) and non‐bridging oxygen hole center (Ge‐NBOHC) were found in the BGG glass based on thermoluminescence and EPR measurements 21 .…”

Section: Resultssupporting

confidence: 59%

“…As confirmed before, the RD effects came from the formation of Ge-related color centers defects after γ-ray irradiation. 21,53 Two kinds of γray-induced defects of Ge-related electron center (GEC) and non-bridging oxygen hole center (Ge-NBOHC) were found in the BGG glass based on thermoluminescence and EPR measurements. 21 The absorption band of GEC defect centers is around 315 nm, and the absorption peak of Ge-NBOHC defect is at 375 nm.…”

Section: 2mentioning

confidence: 99%

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Heat treatment to regulate bismuth valence toward enhanced radiation resistance in barium gallo‐germanate glass

et al. 2022

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Due to the excellent infrared transparency, low phonon energy, and high rare‐earth solubility, germanate laser glass has attracted much attention in mid‐infrared fiber lasers for potential coherent laser radar systems, optical detection, remote sensing, and laser surgery. However, radiation‐induce darkening often occurs in fiber lasers that operate in radiation environment. Here, we report a useful strategy to improve the radiation resistance by adding multivalence Bi ions and discuss its radiation resistance mechanism. In order to study the effect of valence states on the radiation resistance of barium gallo‐germanate glass, we adjust the valence states of Bi ions by heat treatment, the potential mechanism of which is discussed in detail based on the absorption, photoluminescence (PL), and Raman spectra. The absorption, electron paramagnetic resonance, and photoluminescence spectra have proved the interconversion of Bi ions between low and high valence, which inhibits the formation of Ge‐related electron center (GEC) and non‐bridging oxygen hole center defects in the irradiation process. In addition, the Bi3+ content increased by heat treatment is beneficial to serve as electron‐trapping centers in γ‐ray irradiation, thus further reducing the formation of GEC. This study provides a simple method to achieve Bi valence regulation, so as to improve the radiation resistance.

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Section: Resultssupporting

confidence: 59%

Section: 2mentioning

confidence: 99%

Heat treatment to regulate bismuth valence toward enhanced radiation resistance in barium gallo‐germanate glass

et al. 2022

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“…Note that when B was present in the optical fiber core, it acted as an impurity and was affected by the primary RIA. However, when B existed in the cladding, it did not affect the RIA to increase directly but it affected the light interaction characteristics at the interface between the core and the outer cladding for radiation hardening [58,59]. Also, the presence of B in the depressed-index inner cladding increased light transmission by increasing the evanescent field coupling due to the change in the refractive index by the γ-ray irradiation [60].…”

Section: Discussionmentioning

confidence: 99%

Effect of Temperature and Gamma-Ray Irradiation on Optical Characteristics of Fiber Bragg Grating Inscribed Radiation-Resistant Optical Fiber

Kim

Linganna

et al. 2019

Photonic Sens

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A new radiation-hard germano-silicate glass optical fiber with a pure silica glass buffer and a boron-doped silica glass inner cladding was fabricated for temperature sensor application based on the fiber Bragg grating (FBG) under -ray irradiation environment. The temperature dependences of optical attenuation at 1550.5 nm and Bragg reflection wavelength shift from 18 ℃ to 40 ℃ before the γ-ray irradiation were about 4.5710-4 dB/ ℃ and 5.48 pm/ ℃ , respectively. The radiation-induced optical attenuation at 1550.5 nm and the radiation-induced Bragg reflection wavelength shift under the γ-ray irradiation with the total dose of 22.85 kGy at 35 ℃ were about 0.03 dB/m and 0.12 nm, respectively, with the γ-ray irradiation sensitivity of 5.2510-3 pm/Gy. The temperature and the γ-ray irradiation dependence of optical attenuation at 1550.5 nm in the FBG written fiber with boron-doped silica glass inner cladding were about 6 times and 4 times lower than that in the FBG written fiber without boron-doped silica glass inner cladding under a temperature change from 18 ℃ to 40 ℃ and the γ-ray irradiation with the total dose of 22.85 kGy at 35 ℃, respectively. Furthermore, the effect of temperature increase on the Bragg reflection wavelength of the FBG written fiber with boron-doped silica inner cladding was much larger about 1000 times than that of the γ-ray irradiation. However, no influence on the reflection power of the Bragg wavelengths and the full width at half maximum (FWHM) bandwidth under temperature and the γ-ray irradiation change was found. Also, after the γ-ray irradiation with the dose of 22.85 kGy, no significant change in the refractive index was found but the residual stresses developed in the fiber were slightly relaxed or retained.

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“…The mechanism of the RD in BGG glasses has been investigated in previous studies. [15][16][17][18][19][20][21] It has been verified that the RD effects came from the formation of Ge-related color centers defects after γ-ray irradiation. Two kinds of γ-ray inducing defects, Ge-related non-bridging oxygen hole center (Ge-NBOHC) and Ge-related electron center (GEC), were founded in the BGG glass based on thermoluminescence and EPR measurements.…”

Section: Absorption Spectrummentioning

confidence: 99%

Radiation resistance property of barium gallo-germanate glass doped by Nb₂O₅

Liu¹,

Chen²,

Liu³

et al. 2022

Chinese Phys. B

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Effects of Nb2O5 dopant on the radiation response of barium gallo-germanate (BGG) glass are studied mainly by electron paramagnetic resonance and absorption spectroscopy. Owing to the Nb5+↔Nb3+ interconversion in doped samples, formations of Ge-related non-bridging oxygen hole center and Ge-related electron center defects after γ-ray irradiation are inhibited. Thereby, Nb2O5 dopant can enhance radiation resistance of BGG glass, and 1.0% Nb2O5 concentration is the best.

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Fabrication and Gamma-Ray Irradiation Effect on Optical and Mechanical Properties of Germano-Silicate Glass Fibers with Inner Cladding of B and F Doped Silica Glasses

Cited by 8 publications

References 34 publications

Heat treatment to regulate bismuth valence toward enhanced radiation resistance in barium gallo‐germanate glass

Heat treatment to regulate bismuth valence toward enhanced radiation resistance in barium gallo‐germanate glass

Effect of Temperature and Gamma-Ray Irradiation on Optical Characteristics of Fiber Bragg Grating Inscribed Radiation-Resistant Optical Fiber

Radiation resistance property of barium gallo-germanate glass doped by Nb₂O₅

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Fabrication and Gamma-Ray Irradiation Effect on Optical and Mechanical Properties of Germano-Silicate Glass Fibers with Inner Cladding of B and F Doped Silica Glasses

Cited by 8 publications

References 34 publications

Heat treatment to regulate bismuth valence toward enhanced radiation resistance in barium gallo‐germanate glass

Heat treatment to regulate bismuth valence toward enhanced radiation resistance in barium gallo‐germanate glass

Effect of Temperature and Gamma-Ray Irradiation on Optical Characteristics of Fiber Bragg Grating Inscribed Radiation-Resistant Optical Fiber

Radiation resistance property of barium gallo-germanate glass doped by Nb2O5

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Radiation resistance property of barium gallo-germanate glass doped by Nb₂O₅