Journal
OPTICS LETTERS
Volume 42, Issue 9, Pages 1808-1811Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.001808
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Funding
- National Institutes of Health (NIH) [1R21NS084301-01A1]
- National Science Foundation (NSF) [1151154]
- U.S. Department of the Interior (DOI) [BSEE-1040]
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [1553063] Funding Source: National Science Foundation
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A multipoint, side-firing design enables an optical fiber to output light at multiple desired locations along the fiber body. This provides advantages over traditional end-toend fibers, especially in applications requiring fiber bundles such as brain stimulation or remote sensing. This Letter demonstrates that continuous wave (CW) laser micro-ablation can controllably create conical-shaped cavities, or side windows, for outputting light. The dimensions of these cavities determine the amount of firing light and their firing angle. Experimental data show that a single side window on a 730 mu m fiber can deliver more than 8% of the input light. This can be increased to more than 19% on a 65 mu m fiber with side windows created using femtosecond laser ablation and chemical etching. Fine control of light distribution along an optical fiber is critical for various biomedical applications such as light-activated drug-release and optogenetics studies. (C) 2017 Optical Society of America
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