Femtosecond laser inscribed helical sapphire fiber Bragg gratings

doi:10.1364/OL.439373

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	Femtosecond laser inscribed helical sapphire fiber Bragg gratings
	Q. Guo; S. Liu; X. Pan; B. Wang; Z. Tian; C. Chen; Q. Chen; Y. Yu and H. Sun
	2021
Source Publication	Optics Letters
ISSN	1469592
Volume	46 Issue:19 Pages:4836-4839
Abstract	This Letter reports a novel helical sapphire fiber Bragg grating (HSFBG) in a single crystal sapphire fiber with diameter of 60 m fabricated by a 515 nm femtosecond laser. Due to the large refractive index modulation region and high structural symmetry of the HSFBGs, high-reflectivity and high-quality spectra can be prepared and additionally have good bending resistance. The spectral properties of HSFBGs with different helical diameters are studied. When the helical diameter is 30 m, the reflectivity of HSFBG is 40%, the full width at half-maximum is 1.56 nm, and the signal-to-noise ratio is 16 dB. For the HSFBG bending test, the minimum bending radius is 5 mm, which can still maintain relatively good spectral quality. In addition, the HSFBG array with different periods has been successfully cascaded in a sapphire fiber. The experimental results of the HSFBG high-temperature test show that this HSFBG can work reliably at 1600C, and the temperature sensitivity in the high-temperature range can reach 35.55 pm/C. This HSFBG can be used in high-temperature and harsh environments, such as metal smelting and aeroengine structural health monitoring. 2021 Optical Society of America
DOI	10.1364/OL.439373
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Indexed By	SCI ; EI
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Document Type	期刊论文
Identifier	http://ir.ciomp.ac.cn/handle/181722/65250
Collection	中国科学院长春光学精密机械与物理研究所
Recommended Citation GB/T 7714	Q. Guo,S. Liu,X. Pan,et al. Femtosecond laser inscribed helical sapphire fiber Bragg gratings[J]. Optics Letters,2021,46(19):4836-4839.
APA	Q. Guo.,S. Liu.,X. Pan.,B. Wang.,Z. Tian.,...&Y. Yu and H. Sun.(2021).Femtosecond laser inscribed helical sapphire fiber Bragg gratings.Optics Letters,46(19),4836-4839.
MLA	Q. Guo,et al."Femtosecond laser inscribed helical sapphire fiber Bragg gratings".Optics Letters 46.19(2021):4836-4839.

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中国科学院长春光学精密机械与物理研究所