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Deposition Sciences Inc. - Difficult Coatings - LB - 8/23

Tapered Waveguide Answers Perplexing Question

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How do you create a small laser spot at the bottom of a narrow hole?

Breck Hitz

There are occasions in medicine — dentistry, in particular — when it is desirable to focus a laser beam to a small, intense spot some distance behind a small aperture. Root canal surgery is one example, and the treatment of dental caries is another. Figure 1. The inside diameter of this hollow taper was 700 μm at the input end and 200 μm at the output. Reprinted with permission of Optics Letters. Even with high-quality beams from today’s lasers, a simple lens cannot perform the task. In practice, a fiber optic tip commonly is used to get the light into the small opening,...Read full article

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    Published: May 2007
    Glossary
    tapered waveguide
    A waveguide having a characteristic that is altered continuously with the distance traveled, relative to the axis of its path.
    CoatingsResearch & Technologytapered waveguideTech PulseTohoku University

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