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Hollow sapphire fibers for the delivery of CO2 laser energy

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Abstract

Hollow sapphire tubing has been used to deliver nearly single-mode CO2 laser energy. The hollow single-crystal Al2O3 fiber has an n < 1 cladding at 10.6 μm. Measured losses at 10.6 μm are as low as 0.49 dB/m, and the minimum bend radius of the 580 μm × 380 μm fiber is 14 cm. Bending losses are shown to vary as 1/R, and essentially only the HE11 mode propagates in the bent guide.

© 1990 Optical Society of America

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