Abstract
We present fiber Bragg gratings (FBGs) fabricated using adaptive optics aberration compensation for the first time to the best of our knowledge. The FBGs are fabricated with a femtosecond laser by the point-by-point method using an air-based objective lens, removing the requirement for immersion oil or ferrules. We demonstrate a general phase correction strategy that can be used for accurate fabrication at any point in the fiber cross-section. We also demonstrate a beam-shaping approach that nullifies the aberration when focused inside a central fiber core. Both strategies give results which are in excellent agreement with coupled-mode theory. An extremely low wavelength polarization sensitivity of 4pm is reported.
Highlights
We present fiber Bragg gratings (FBGs) fabricated using adaptive optics aberration compensation for the first time to the best of our knowledge
Deployed FBGs are typically fabricated by exposing photosensitive optical fibers to ultra-violet (UV) radiation by interfering two beams [2] or using a phase mask [3]
While the quality of femtosecond FBGs is typically inferior to their UV counterparts, they may be written in standard silica single mode fiber (SMF) without pre-processing such as hydrogenation, reducing time and cost
Summary
We present fiber Bragg gratings (FBGs) fabricated using adaptive optics aberration compensation for the first time to the best of our knowledge. Aberration correction and beam-shaping, are used to enable high quality FBGs with good spectral response and low polarization sensitivity, without the use of ferrules or oil immersion optics.
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