Garmire E, McMahon T, Bass M
Appl Opt. 1976 Jan 1;15(1):145-50. doi: 10.1364/AO.15.000145.
Designs are described for flexible hollow waveguides with low ir loss over distances on the order of 1 m. Transmission losses at 10.6 microm are calculated, and the effect of bends and twists is discussed. A hollow combination metal-dielectric-walled rectangular waveguide is proposed that can have transmission as high as 95% for a 1-m length, while bent with a 1-m radius of curvature.
