Large-core tube-leaky waveguide for delivery of high-powered Er:YAG laser

S. Kobayashi; T. Katagiri; Y. Matsuura

doi:10.1117/12.2037467

20 February 2014 Large-core tube-leaky waveguide for delivery of high-powered Er:YAG laser

S. Kobayashi, T. Katagiri, Y. Matsuura

Proceedings Volume 8938, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIV; 89381A (2014) https://doi.org/10.1117/12.2037467
Event: SPIE BiOS, 2014, San Francisco, California, United States

Abstract

A tube-leaky fiber that consists of only dielectric thin-film tubing for delivery of Er:YAG laser light is presented. The tube-leaky fiber confines light in the airy core when the film thickness is properly chosen for target wavelength. Transmission properties of the fibers are derived by using a ray optic method and designed the optimum wall thickness for the Er:YAG laser wavelength of 2.94 micron. In fabrication of the tube leaky fiber, we use a microstructural tube made of glass to enhance mechanical strength. The central bore and surrounding glass thin layer that is held by the microstructure function as a tube-leaky fiber. We fabricate a large-core fiber for delivery of high-power medical lasers by stack-and-draw method and we use borosilicate-glass as a fiber material for low cost fabrication. Fabricated fibers have a diameter over 400 μm and from the loss measurements for Er:YAG laser, and the fibers deliver laser light with a transmission loss of 0.85 dB/m that is comparable to 0.7 dB/m of conventional hollow-optical fibers. The fibers withstand transmission of laser pulses with energy higher than 120 mJ. We confirm that these energies are enough to ablate biological tissues in surgical operations.

Citation Download Citation

S. Kobayashi, T. Katagiri, and Y. Matsuura "Large-core tube-leaky waveguide for delivery of high-powered Er:YAG laser", Proc. SPIE 8938, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIV, 89381A (20 February 2014); https://doi.org/10.1117/12.2037467

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KEYWORDS

Glasses

Er:YAG lasers

Waveguides

Dielectrics

Structured optical fibers

Absorption

Capillaries

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