Effect of enclosed space pressure on thermal regeneration of hydrogen-loaded fiber Bragg gratings

IF 4.6 2区 物理与天体物理 Q1 OPTICS
Jiajin Zheng , Rubing Bai , Yundi Wang , Junyu Lu , Jianwen Zhou , Zengya Zhang , Shanshan Cao , Wei Li , Kehan Yu , Wei Wei
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Abstract

The type-I fiber Bragg grating (FBG) was annealed at high temperature to obtain a thermally regenerated fiber Bragg gratings, which can operate reliably in the environments above 1100 °C without any decay of the grating spectrum. However, the underlying thermal regeneration mechanism of FBG has remained unclear until now. Here the thermal regeneration mechanism of FBG was discussed by studying the phenomenon of high-temperature decay and regeneration of FBG in an enclosed space. The thermal decay and regeneration processes of FBGs encapsulated in different volumes were investigated experimentally. The experimental results confirm that hydrogen stored in the hydrogen-loaded fiber diffuses out and then increasing pressure of the enclosed space during the high-temperature regeneration and annealing process of packaged FBG. Once this pressure reaches 0.9 MPa, FBG cannot be regenerated successfully. Comparative analysis with existing regeneration mechanisms reveals that the fundamental cause of thermal regeneration for FBG tends to follow a stress-induced model. However, external pressure affects the periodic distribution of refractive index associated with stress-induced regeneration. When pressure within the confined space reaches a certain critical value, the periodic distribution of stress for FBG will be affected, thus inhibiting the regeneration of FBG.
封闭空间压力对含氢光纤布拉格光栅热再生的影响
通过对I型光纤布拉格光栅(FBG)进行高温退火处理,可以获得热再生光纤布拉格光栅,这种光栅可以在1100 °C以上的环境中可靠运行,且光栅光谱不会出现任何衰减。然而,FBG的热再生机理至今仍不清楚。本文通过研究 FBG 在密闭空间中的高温衰减和再生现象,探讨了 FBG 的热再生机制。实验研究了不同体积封装的 FBG 的热衰减和再生过程。实验结果证实,在封装 FBG 的高温再生和退火过程中,储存在含氢光纤中的氢会扩散出来,进而增加封闭空间的压力。一旦压力达到 0.9 兆帕,FBG 就无法成功再生。与现有再生机制的对比分析表明,FBG 热再生的根本原因往往遵循应力诱导模型。然而,外部压力会影响与应力诱导再生相关的折射率周期性分布。当密闭空间内的压力达到某个临界值时,FBG 的应力周期分布将受到影响,从而抑制 FBG 的再生。
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来源期刊
CiteScore
8.50
自引率
10.00%
发文量
1060
审稿时长
3.4 months
期刊介绍: Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems
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