Answers are grounded in this paper and cite their sources.
The structure of fiber Bragg gratings inscribed point-by-point by an infrared femtosecond laser is studied by quantitative phase microscopy. Results show that these gratings present a central region with a depressed refractive index surrounded by an outer corona with increased refractive index. The refractive index profile suggests the presence of microvoids embedded in a region of the core
No takes yet. Share an insight, caveat, or question.
Martinez et al. (2006) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: