Abstract
The transmission of a Gaussian beam through a dielectric-coated hollow tapered metallic waveguide is numerically evaluated. It is shown that the tapered hollow coated circular waveguide has a low transmission loss with a large usable spectral window and that an unfocused laser beam can be launched into the waveguide with low coupling loss. A dielectric coated hollow tapered waveguide of optical quality is fabricated using a procedure involving core preparation, vacuum coating and acid etching. Efficient light transmission through a non-tapered (uniform bore) and tapered dielectric-coated hollow metallic waveguide is observed.
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