Experimental Study on Effects of Pulsed γ-Ray Radiation on Optical Fibers
The general mechanism of light transmission loss in optical fibers and γ-ray radiation effects on optical fibers are introduced. In order to measure pulsed y-ray radiation-induced loss,an experimental measurement system is developed. Using the average photon energy of 0.3 MeV,pulse width of 25 ns,dose rate of 2.03xl07 Gy/s and the average photon energy of 1.0 MeV,pulse width of 25ns,dose rate of 5.32×109 Gy/s as irradiation sources,thetransient radiation-induced loss of pulsed y-ray on available single mode and multi-mode optical fibers are measured respectively. The experimental measurement system employs diode lasers with five wavelengths such as 405,660,850,1310 and 1550 nm as detecting light carriers. The transient radiation-induced loss and the relationship between losses and doses are analyzed. From the experimental results it can be seen that the transient radiation-induced loss will increase as the detecting laser wavelength shifts from near-infrared to visible regions of optical spectrum. Within the dose range of 0.1-3.5 Gy,the transient radiation-induced loss of multi-mode fiber shows an approximate linear relationship with the total dose. The conclusion can be deduced that the radiation-induced loss results from two comprehensive effects. Generations of new color centers in optical fiber matrix cause absorption losses and changes of refractive index distribution lead to additional waveguide losses respectively.
pulsed y-ray optical fiber: transient radiation-induced loss color center: defect refractive index
Liu Fuhua An Yuying Wang Ping Shao Bibao Chen Shaowu
School of Technical Physics,Xidian University,Xian,China State Key Laboratory of Laser Interaction School of Technical Physics,Xidian University,Xian,China State Key Laboratory of Laser Interaction with Matter,Northwest Institute of Nuclear Technology,Xia
国际会议
西安
英文
456-460
2011-12-23（万方平台首次上网日期，不代表论文的发表时间）