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Double-clad fiber with a tapered end for confocal endomicroscopy

Biomedical Optics Express, ISSN: 2156-7085, Vol: 2, Issue: 11, Page: 2961-2972
2011
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Article Description

We present a double-clad fiber coupler (DCFC) for use in confocal endomicroscopy to reduce speckle contrast, increase signal collection while preserving optical sectioning. The DCFC is made by incorporating a double-clad tapered fiber (DCTF) to a fused-tapered DCFC for achromatic transmission (from 1265 nm to 1325 nm) of > 95% illumination light trough the single mode (SM) core and collection of > 40% diffuse light through inner cladding modes. Its potential for confocal endomicroscopy is demonstrated in a spectrally-encoded imaging setup which shows a 3 times reduction in speckle contrast as well as 5.5× increase in signal collection compared to imaging with a SM fiber. © 2011 Optical Society of America.

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