Sapphire fiber Bragg gratings inscribed with a femtosecond laser line-by-line scanning technique

Xu, Xizhen; He, Jun; Liao, Changrui; Yang, Kaiming; Guo, Kuikui; Li, Chi; Zhang, Yunfang; Ouyang, Zhengbiao; Wang, Yiping

doi:10.1364/ol.43.004562

Cited by 65 publications

(20 citation statements)

References 21 publications

(49 reference statements)

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“…Narrow peak was obtained from the reflection spectrum as the diameter of the SF was etched to 9.6 μm. Furthermore, a line-by-line scanning technique was proposed to increase the total reflectivity of an SFBG [52].…”

Section: Fbgs On Sfmentioning

confidence: 99%

Fiber-Optic Microstructure Sensors: A Review

Ran

Rao

et al. 2021

Photonic Sens

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This paper reviews a wide variety of fiber-optic microstructure (FOM) sensors, such as fiber Bragg grating (FBG) sensors, long-period fiber grating (LPFG) sensors, Fabry-Perot interferometer (FPI) sensors, Mach-Zehnder interferometer (MZI) sensors, Michelson interferometer (MI) sensors, and Sagnac interferometer (SI) sensors. Each FOM sensor has been introduced in the terms of structure types, fabrication methods, and their sensing applications. In addition, the sensing characteristics of different structures under the same type of FOM sensor are compared, and the sensing characteristics of the all FOM sensors, including advantages, disadvantages, and main sensing parameters, are summarized. We also discuss the future development of FOM sensors.

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Section: Fbgs On Sfmentioning

confidence: 99%

Fiber-Optic Microstructure Sensors: A Review

Ran

Rao

et al. 2021

Photonic Sens

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“…A variety of optical fiber sensors have been fabricated to gather information of multifarious physical and chemical parameters, such as temperature [1], pressure [2], curvature [3,4], humidity [5], and refractive index (RI) [6]. In order to fabricate these sensors, various kinds of fibers are adopted, such as photonic crystal fiber (PCF) [7,8], polarization-maintaining fiber [9,10], twin-core fiber [11], sapphire optical fiber [12], micro-fiber [13], and D-shaped fiber [14]. The measurement principle of the sensors depends on the devices, such as the fiber Bragg grating (FBG) [15], long period grating [16], tapered fiber [17], Mach-Zehnder interferometer (MZI) [18], Fabry-Perot interferometer (FPI) [19], and Sagnac loop interferometer [20].…”

Section: Introductionmentioning

confidence: 99%

A Probe-Shaped Sensor With FBG and Fiber-Tip Bubble for Pressure and Temperature Sensing

et al. 2021

Self Cite

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A probe-shaped sensor for simultaneous temperature and pressure measurement was reported in this article. The effective length of the sensor was ∼2mm, consisting of a fiber Bragg grating (FBG) and a Fabry-Perot interferometer (FPI) with a nano silica diaphragm. The response sensitivities of the sensor for pressure and temperature were measured as −0.98 nm/MPa and 11.10 pm/°C, respectively. This sensor had an extremely low cross-sensitivity between pressure and temperature, which provided a significant potential in dual-parameter sensing.

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“…Besides, due to a larger overlap between refractive index modulation and mode profile compared with PBP-FBGs, the LBL technique was suitable for large core FBG inscription. For example, Xu et al fabricated sapphire FBGs via the femtosecond laser LBL technique, and a reflectivity of 6.3% was realized by optimizing fabrication parameters [15]. By inscribing an LBL-FBG with a reflectivity of 13.2% on an Yb-doped large core area double-clad fiber as a cavity mirror, a fiber laser with a spectral full width at a half-maximum of 0.56 nm was obtained [16].…”

Section: Introductionmentioning

confidence: 99%

Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings

Zhao

Rao

et al. 2021

Sensors

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Line-by-line direct writing by femtosecond laser has been proved to be a simple and effective method for the fabrication of low-loss fiber Bragg gratings (FBGs), and is more flexible compared with the traditional ultraviolet exposure method. In this paper, the line-position-dependent characteristics of cladding modes coupling in line-by-line FBGs have been studied, to the best of our knowledge, for the first time. Both theoretical and experimental results show that off-center inscribing could compress the bandwidth of the Bragg resonance and excite more abundant cladding mode coupling, in which the core-guided fundamental mode would couple to the cladding-guided LP0n and LP1n simultaneously. By aligning the line positions across the core region, the first apodized line-by-line FBG was achieved. This work enriches the theories of line-by-line FBGs and provides an inscription guidance to meet different application requirements.

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Sapphire fiber Bragg gratings inscribed with a femtosecond laser line-by-line scanning technique

Cited by 65 publications

References 21 publications

Fiber-Optic Microstructure Sensors: A Review

Fiber-Optic Microstructure Sensors: A Review

A Probe-Shaped Sensor With FBG and Fiber-Tip Bubble for Pressure and Temperature Sensing

Line Position-Dependent Effect in Line-by-Line Inscribed Fiber Bragg Gratings

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