Flexible infrared-transmissive metal waveguides

Abstract
We report unexpectedly low‐loss optical transmission at 10.6 μm through a 1‐m‐long hollow rectangular metallic waveguide bent through 90° in a 50‐cm radius of curvature. This demonstrates that flexible infrared‐transmissive (FIT) waveguides can deliver CO2 laser power to targets nearly as conveniently as optical fibers guide visible light.

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