Investigation of glow discharge of gas in hollow-core fibers |
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| Authors: | X. Shi X.B. Wang W. Jin M.S. Demokan |
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| Affiliation: | (1) Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;(2) School of Optoelectronic Science and Engineering, The Huazhong University of Science and Technology, Wuhan, P.R. China |
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| Abstract: | For the purpose of constructing novel waveguide gas lasers based on hollow-core fibers, we carried out a series of discharge experiments and succeeded in obtaining sustained glow discharge of gas in a 150-μm-inner-diameter (i.d.) hollow-core fiber with the length of 13.7 cm and in a 50-μm-i.d. hollow-core fiber with the length of 2.9 cm by using longitudinal direct current excitation. A flash glow is also observed in hollow-core photonic bandgap fiber with 20-μm i.d. and 2.6-cm length. Initial measurements of current–voltage (I–V) characteristics have been carried out for fibers of various hollow-core sizes filled with various gases at different pressures. Theoretical I–V characteristics are presented and compared with experimental results. Gas discharges in miniature-bore hollow-core fibers were found to exhibit unique characteristics that are different from the traditional larger-bore-diameter tubes. The glow-discharge spectrum of helium gas in a 150-μm-i.d. and 8-cm-length hollow-core fiber is also presented. PACS 42.55.Wd; 42.55.Lt; 52.80.-s |
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