Side-emission properties of femtosecond laser induced scattering centers in optical fibers

Fiber optical light diffusers that enable interstitial light delivery have become a useful tool for various illumination tasks, such as in photodynamic therapy. However, existing methods based on light diffusing fiber tips are not applicable for spatially selective light delivery in more complex str...

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Bibliographic Details
Published in:Optical materials express 2019-06, Vol.9 (6), p.2497
Main Authors: Reupert, Aaron, Heck, Maximilian, Nolte, Stefan, Wondraczek, Lothar
Format: Article
Language:English
Subjects:
Cladding
Diffusers
Emission analysis
Fiber optics
Light
Optical fibers
Optical properties
Photodynamic therapy
Scattering
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Summary:Fiber optical light diffusers that enable interstitial light delivery have become a useful tool for various illumination tasks, such as in photodynamic therapy. However, existing methods based on light diffusing fiber tips are not applicable for spatially selective light delivery in more complex structures. Here, we employ femtosecond laser induced scattering centers without mechanical manipulation and removal of the outer coatings for generating customized emission patterns. Tailoring of the cumulative emission profile is achieved through controlling the step-width between modification spots. An in-depth evaluation shows that the side-emission pattern is the result of an interplay of several scattering mechanisms that interact with cladding and core modes.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.9.002497