Single-crystal sapphire fibers are produced by the laser heated pedestal growth technique. The fibers have attenuation coefficients of less than 2 dB/m at the Er:YAG laser wavelength of 2.94 μm and are used to deliver over 600 mJ of Er:YAG laser energy. Mechanical testing of these fibers and the sapphire fibers produced by the edge-defined, film-fed growth technique results in a measured 0.4% strain to failure when testing is done under a 4-point load. Teflon-FEP (perfluorinated ethylene propylene) is applied to sapphire fibers as a cladding. The cladding is extremely effective in preventing leakage of energy from the fibers into absorbing environments that may surround the fiber.
© 1993 Optical Society of America
Original Manuscript: April 29, 1992
Published: June 20, 1993
Glenn N. Merberg and James A. Harrington, "Optical and mechanical properties of single-crystal sapphire optical fibers," Appl. Opt. 32, 3201-3209 (1993)