The attenuation and input end heating of hollow-glass waveguides are greatly affected by the way in which the input laser energy is coupled into the guides. A theoretical discussion 0 conditions is related to waveguide loss and local heating, occur when the coupling is not optimized. Our results indicate optimum coupling for maximum transmission is not lent to optimum coupling to the lowest order HE↓(11) mode. Additionally, it is shown that the input end heating of these waveguides can be reduced substantially with minimal effect on transmission if the waveguide bore size is large. #1998 Society of Photo-Optical Instrumentation Engineers. S0091-3286(98)00809-5 Subject terms: fiber optics; hollow waveguides; hollow-glass waveguides; cou-pling efficiency; waveguide modes; beam delivery; carbon dioxide las Paper 12117 received Nov. 20, 1997; revised manuscript received Mar accepted for publication Mar. 23, 1998.
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