Low-loss lead fluoride-coated square waveguides for CO 2 laser light transmission

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Abstract
Small-core (1mm × 1mm) phosphor bronze square waveguides whose inner two or four walls are coated with a thin lead fluoride layer have been fabricated by using vacuum-evaporation and assembly techniques. Straight waveguide transmissions as high as 80% are obtained even when the waveguides are bent with a bending radius of 50cm in 1m long waveguides.