Optimized laser-written ZBLAN fiber Bragg gratings with high reflectivity and low loss

Optimized laser-written ZBLAN fiber Bragg gratings with high reflectivity and low loss

We report the direct femtosecond laser inscription of type-I fiber Bragg gratings (FBGs) into the core of soft-glass ZBLAN fibers. We investigate and compare various fabrication methods such as single pass (line by line), double pass, and stacking (plane by plane) to create the highest reflectivity...

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Veröffentlicht in:Optics letters 2019-01, Vol.44 (2), p.423-426
Hauptverfasser: Bharathan, Gayathri, Fernandez, Toney Teddy, Ams, Martin, Woodward, Robert I, Hudson, Darren D, Fuerbach, Alex
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Bragg gratings
Coupling coefficients
Reflectance
Refractivity
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container_end_page 426
container_issue 2
container_start_page 423
container_title Optics letters
container_volume 44
creator Bharathan, Gayathri
Fernandez, Toney Teddy
Ams, Martin
Woodward, Robert I
Hudson, Darren D
Fuerbach, Alex
description We report the direct femtosecond laser inscription of type-I fiber Bragg gratings (FBGs) into the core of soft-glass ZBLAN fibers. We investigate and compare various fabrication methods such as single pass (line by line), double pass, and stacking (plane by plane) to create the highest reflectivity FBGs (99.98%) for mid-infrared (mid-IR) applications. In addition, we experimentally demonstrate how the parameters that influence the coupling coefficient, i.e., refractive index modulation and overlap factor, can be controlled in these gratings to specifically tailor the FBG properties. The performance of the direct-written type-I gratings after 6 h of annealing is further analyzed, and the reflectivity increases by approximately 10 dB. To the best of our knowledge, this is the first demonstration of temperature-stable mid-IR FBGs with highest coupling coefficient (464  m ) and lowest loss (
doi_str_mv 10.1364/OL.44.000423
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subjects Bragg gratings
Coupling coefficients
Reflectance
Refractivity
title Optimized laser-written ZBLAN fiber Bragg gratings with high reflectivity and low loss
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