scholarly journals Radiation-Induced Transient Absorption In Single Mode Optical Fibers

1989 ◽  
Author(s):  
Larry D. Looney ◽  
Peter B. Lyons
Keyword(s):  
Optical Fibers ◽  
Transient Absorption ◽  
Single Mode ◽  
Radiation Induced

Gamma-radiation-induced degradation of actively pumped single-mode ytterbium-doped optical fibers

2014 ◽  
Author(s):  
B. Singleton ◽  
J. Petrosky ◽  
M. Pochet ◽  
N. G. Usechak ◽  
S. A. Francis
Keyword(s):  
Gamma Radiation ◽  
Optical Fibers ◽  
Single Mode ◽  
Radiation Induced

Radiation-Induced-Defects Localization in Single-Mode Optical Fibers

2005 ◽  
Vol 480-481 ◽  
pp. 329-332 ◽  
Author(s):  
Sylvain Girard ◽  
A. Boukenter ◽  
Y. Ouerdane ◽  
J.-P. Meunier
Keyword(s):  
Optical Fibers ◽  
Single Mode ◽  
Wavelength Dependence ◽  
Radiation Sensitivity ◽  
Color Centers ◽  
Strong Interactions ◽  
Radiation Induced ◽  
Different Color ◽  
Induced Defects

We studied the defects at the origins of the permanent radiation-induced attenuation in four g-rays irradiated single-mode germanosilicate optical fibers (~1 MeV; 1.2 kGy; 0.3 Gy/s) in the spectral range 400 - 1700 nm. We determined the wavelength dependence of the following cladding codopant influences: germanium (0.3 %), phosphorus (0.3 %), fluorine (0.3 %) on the germanosilicate (13 %) fiber radiation responses. We identified some of the different color centers produced by g-rays and we evaluated their localization in the fiber cross-section through the determination of the radial distribution of the radiation-induced absorption at 633 nm. We also evidenced the strong interactions between these three codopants. In particular, our results showed that the properties of the phosphorus-related color centers, which mainly determine the fiber infrared radiation sensitivity, are strongly influenced by the germanium- and fluorine-codoping.

scholarly journals Radiation-Induced Transient Absorption In Optical Fibers

1982 ◽  
Author(s):  
L. D. Looney ◽  
G. Turquet de Beauregard ◽  
P. B. Lyons ◽  
R. E. Kelly
Keyword(s):  
Optical Fibers ◽  
Transient Absorption ◽  
Radiation Induced

scholarly journals Real-time Ultraviolet Radiation Sensor Based on Modified Cladding Optical Fibers Technology

2021 ◽  
pp. 4667-4673
Author(s):  
Nadia F. Muhammed ◽  
Aseel I. Mahmood ◽  
Shehab A. Kadhim ◽  
Intisar A. Naseef ◽  
Ashwaq A. Jabor ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Optical Fibers ◽  
Near Infrared ◽  
Single Mode ◽  
Radiation Energy ◽  
Peak Wavelength ◽  
Fiber Sensors ◽  
Radiation Sensor ◽  
All Optical ◽  
Radiation Induced

      In this work, the performance of single-mode optical fibers (SMFs) for ultraviolet (UV) radiation monitoring and dosimetry applications is presented. In particular, this work will focus on the Radiation-Induced Absorption (RIA) phenomena in the Near-Infrared domain (NIR). Such phenomena play a very important role in the sensing mechanism for SMF. Single mode fibers with a diameter of 50 µm were used for this purpose. These fibers were dipped into germanium (Ge) solution with different concentrations (1, 3, and 5 wt%) to produce the sensing part of the sensor. For all optical fiber sensors under investigation, the results indicated the dependence of the RIA on the applied UV radiation energy. Also, a redshift in peak wavelength was obtained. The influence of Ge concentration on sensing efficiency was studied and the best results were obtained with 3 wt% concentration as compared to 1 wt % and 5 wt % concentrations. The presented sensor shows good sensitivity to UV radiation which makes it possible to be applied in medical applications.

Gamma-induced attenuation in normal single-mode and multimode, Ge-doped and P-doped optical fibers: A fiber optic dosimeter for low dose levels

2000 ◽  
Vol 78 (2) ◽  
pp. 89-97 ◽  
Author(s):  
Ping Lu ◽  
Xiaoyi Bao ◽  
Kellie Brown ◽  
Narayan Kulkarni
Keyword(s):  
Dose Rate ◽  
Optical Fibers ◽  
Fiber Optic ◽  
Visible Region ◽  
Single Mode ◽  
Dose Rates ◽  
Rate Dependent ◽  
Radiation Induced ◽  
Radiotherapy Dose ◽  
Dose Levels

Ge-doped, P-doped, normal single-mode (SM) and multimode (MM) optical fibers were exposed to Cobalt-60 gamma radiation at dose rates of 0.5 and 3.0 Gy/min, typical radiotherapy dose rates. A CCD-based fiber optic spectrometer was used to measure the real-time absorption spectra of these fibers in the visible region. Experimental results have shown that P-doped fiber is the most radiation-sensitive of the fibers tested. At the wavelength of 502 nm, the radiation-induced loss in P-doped fiber shows a linear relationship with the total dose with no dose-rate dependence. This indicates that dose rates have no influence on a fiber optic dosimeter operating at this wavelength. The radiation-induced losses in normal MM fibers, Ge-doped MM fibers, and Ge-doped SM fibers are shownto be dose-rate dependent. PACS No.: 42.62nBe, 42.81-i

Radiation-Induced Attenuation in Single-Mode Phosphosilicate Optical Fibers for Radiation Detection

2018 ◽  
Vol 65 (1) ◽  
pp. 126-131 ◽  
Author(s):  
D. Di Francesca ◽  
G. Li Vecchi ◽  
S. Girard ◽  
A. Alessi ◽  
I. Reghioua ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Radiation Detection ◽  
Single Mode ◽  
Radiation Induced

Materials Effects on the Radiation Sensitivity of Single Mode Optical Fibers, II

1991 ◽  
Vol 244 ◽  
Author(s):  
E. J. Friebele ◽  
C. G. Askins ◽  
M. A. Putnam ◽  
C. C. Harrington ◽  
M. E. Gingerich ◽  
...  
Keyword(s):  
Experimental Design ◽  
Optical Fibers ◽  
Single Mode ◽  
Radiation Sensitivity ◽  
Single Mode Fiber ◽  
Nuclear Radiation ◽  
One Dimensional ◽  
Fiber Fabrication ◽  
Radiation Induced ◽  
Deposition Conditions

ABSTRACTThe effect of varying single mode fiber fabrication factors such as core and clad dopant concentrations, deposition conditions, and draw parameters on the recovery of the nuclear radiation-induced attenuation at 1.3 μm has been studied. Statistically significant correlations of core factors have been established with a 24 experimental design, and separate one-dimensional experiments revealed the effect of clad [Ge] and [F].

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