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.
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Machida et al. (1991) studied this question.
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