| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Three-Dimensional Thermal Analysis of 18-Core Photonic Crystal Fiber Lasers |
| ZHENG Yi-Bo1,2**, YAO Jian-Quan1, ZHANG Lei2,3, WANG Yuan1,2, WEN Wu-Qi1, JING Lei1, DI Zhi-Gang1 |
1Institute of Laser & Otpoelectronics, College of Precision Instruments and Opto-Electronic Engineering, Key Laboratory of Opto-electronics Information and Technical Science (Ministry of Education), Tianjin University, Tianjin 300072
2Hebei Key Laboratory of Optoelectronic Information and Geo-detection Technology, Shijiazhuang University of Economics, Shijiazhuang 050031
3The College of Gems and Materials Technology, Shijiazhuang University of Economics, Shijiazhuang 050031 |
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Abstract The three-dimensional thermal properties of 18-core photonic crystal fiber lasers operated under natural convection are investigated. The temperature sensing technique based on a fiber Bragg grating sensor array is proposed to measure the longitudinal temperature distribution of a 1.6-m-long ytterbium-doped 18-core photonic crystal fiber. The results show that the temperature decreases from the pump end to the launch end exponentially. Moreover, the radial temperature distribution of the fiber end is investigated by using the full-vector finite-element method. The numerical results match well with the experimental data and the coating temperature reaches 422.7 K, approaching the critical value of polymer cladding, when the pumping power is 40 W. Therefore the fiber end cooling is necessary to achieve power scaling. Compared with natural convection methods, the copper cooling scheme is found to be an effective method to reduce the fiber temperature.
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| Keywords:
42.55.Wd
42.55.Xi
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Received: 22 September 2011
Published: 11 March 2012
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