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Characteristics of Gas Breakdown in Hollow-Core Fibers

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4 Author(s)
Shi, X. ; Hong Kong Polytech. Univ., Hong Kong ; Wang, X.B. ; Jin, W. ; Demokan, M.S.

We succeeded in obtaining gas discharge in 250-, 150-, and 50-mum inner-diameter (i.d.) hollow-core fibers (HCFs) by using longitudinal direct current excitation. Stable glow discharges of at least several minutes were observed for these HCFs. A flash glow was also observed for an HCF with an i.d. of ~20 mum. Breakdown of helium and argon gases in a 26.2-cm-long 250-mum-i.d. HCF was achieved with a voltage of less than 30 kV. Breakdown voltages of helium and argon gases were measured for various bore sizes, fiber lengths, and a pressure range from below 1 to 50 Torr. Experimental results deviated from previous theoretical models and further theoretical and experimental investigations are needed to understand the unique characteristics of gas-discharge in HCFs with i.d. below 250 mum.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 8 )

Date of Publication:

April15, 2008

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