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Enhanced temperature sensitivity of thermally regenerated direct ultraviolet written gratings in germanium doped core fiber

Enhanced temperature sensitivity of thermally regenerated direct ultraviolet written gratings in germanium doped core fiber
Enhanced temperature sensitivity of thermally regenerated direct ultraviolet written gratings in germanium doped core fiber
The use of thermally regenerated gratings for monitoring harsh environments is becoming increasingly attractive due to their thermal resilience and high precision. They are a unique type of Bragg grating created through annealing UV-laser written Fiber Bragg Gratings (FBGs) at high temperatures (above 600°C) and they have been demonstrated to operate at temperatures over 1000 °C in oxygen free environments. In this work we report two new observations. Firstly, a second phase thermal regeneration process at temperatures above 650°C and secondly an enhanced thermal response for these second phase regenerated gratings of over 140%. Uniquely, fabrication of the gratings was made through a small spot Direct Ultraviolet Writing (DUW) process. This utilizes a high precision four-axis stage system and a frequency double argon-ion continuous wave 244 nm laser that is split and recombined at a focus to form a ~7 µm diameter interferometric spot. A series of 46 different FBGs, from 1400 to 1620 nm, were written into a single non-hydrogen loaded double clad germanium doped 4 µm core fiber (Nufern GF4A). Gratings in the series were written with fluences ranging from 0.05 kJ/cm2 up to 90 kJ/cm2.&more...
Jantzen, Alexander
af05e45f-d153-4b8e-ae8b-6474fba5501a
Bannerman, Rex
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Boyd, Lewis
affc04c8-38fd-41ab-83be-cd2bb1e75d71
Smith, Peter
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Holmes, Christopher
16306bb8-8a46-4fd7-bb19-a146758e5263
Jantzen, Alexander
af05e45f-d153-4b8e-ae8b-6474fba5501a
Bannerman, Rex
7f7d5c3e-8e5d-45d5-8fd7-8d1511330e08
Boyd, Lewis
affc04c8-38fd-41ab-83be-cd2bb1e75d71
Smith, Peter
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Holmes, Christopher
16306bb8-8a46-4fd7-bb19-a146758e5263

Jantzen, Alexander, Bannerman, Rex, Boyd, Lewis, Smith, Peter and Holmes, Christopher (2017) Enhanced temperature sensitivity of thermally regenerated direct ultraviolet written gratings in germanium doped core fiber. In Conference on Lasers and Electro-Optics and European Quantum Electronics Conference. (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

The use of thermally regenerated gratings for monitoring harsh environments is becoming increasingly attractive due to their thermal resilience and high precision. They are a unique type of Bragg grating created through annealing UV-laser written Fiber Bragg Gratings (FBGs) at high temperatures (above 600°C) and they have been demonstrated to operate at temperatures over 1000 °C in oxygen free environments. In this work we report two new observations. Firstly, a second phase thermal regeneration process at temperatures above 650°C and secondly an enhanced thermal response for these second phase regenerated gratings of over 140%. Uniquely, fabrication of the gratings was made through a small spot Direct Ultraviolet Writing (DUW) process. This utilizes a high precision four-axis stage system and a frequency double argon-ion continuous wave 244 nm laser that is split and recombined at a focus to form a ~7 µm diameter interferometric spot. A series of 46 different FBGs, from 1400 to 1620 nm, were written into a single non-hydrogen loaded double clad germanium doped 4 µm core fiber (Nufern GF4A). Gratings in the series were written with fluences ranging from 0.05 kJ/cm2 up to 90 kJ/cm2.&more...

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Enhanced Temperature Sensitivity of Thermally Regenerated Direct Ultraviolet Written Gratings in Germanium Doped Core Fiber - Accepted Manuscript
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More information

Accepted/In Press date: 23 March 2017
Venue - Dates: CLEO/Europe - EQEC 2017, Munich, Germany, 2017-06-25 - 2017-06-29
Organisations: Optoelectronics Research Centre, Photonic Systems Circuits & Sensors

Identifiers

Local EPrints ID: 408597
URI: https://eprints.soton.ac.uk/id/eprint/408597
PURE UUID: c41c4867-25d1-4d7a-9f6a-487fa406d46b
ORCID for Peter Smith: ORCID iD orcid.org/0000-0003-0319-718X
ORCID for Christopher Holmes: ORCID iD orcid.org/0000-0001-9021-3760

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Date deposited: 25 May 2017 04:02
Last modified: 17 Oct 2019 00:38

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Contributors

Author: Alexander Jantzen
Author: Rex Bannerman
Author: Lewis Boyd
Author: Peter Smith ORCID iD

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