Femtosecond laser micromachining of Fabry-Perot cavity in fibre Bragg grating

2015 ◽  
Author(s):  
Rodrigo Fiorin ◽  
Fernando N. Cidade ◽  
Jociel L. S. Adachi ◽  
Lucieli Rossi ◽  
Valmir de Oliveira ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Micromachining ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Femtosecond Laser Micromachining ◽  
Fabry Perot

scholarly journals Investigation of a Bragg Grating-Based Fabry–Perot Structure Inscribed Using Femtosecond Laser Micromachining in an Adiabatic Fiber Taper

2020 ◽  
Vol 10 (3) ◽  
pp. 1069 ◽  
Author(s):  
Aayush Madan ◽  
Stephanie Hui Kit Yap ◽  
Varghese Paulose ◽  
Wonkeun Chang ◽  
Perry Ping Shum ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Micromachining ◽  
Bragg Grating ◽  
Outer Diameter ◽  
Core Diameter ◽  
Femtosecond Laser Micromachining ◽  
Fiber Taper ◽  
Fabry Perot ◽  
Potential Applications ◽  
Fs Laser

This paper presents the fabrication of a fiber Bragg grating (FBG)-based Fabry–Perot (FP) structure (7 mm total length) in an adiabatic fiber taper, investigates its strain and temperature characteristics, and compares the sensing characteristics with a standard polyimide coated FBG sensor. Firstly, a simulation of the said structure is presented, followed by the fabrication of an adiabatic fiber taper having the outer diameter reduced to 70 μ m (core diameter to 4.7 μ m). Next, the sensing structure, composed of two identical uniform FBG spaced apart by a small gap, is directly inscribed point-by-point using infrared femtosecond laser (fs-laser) micromachining. Lastly, the strain and temperature behavior for a range up to 3400 μ ε and 225 ° C, respectively, are investigated for the fabricated sensor and the FBG, and compared. The fabricated sensor attains a higher strain sensitivity (2.32 pm/ μ ε ) than the FBG (0.73 pm/ μ ε ), while both the sensors experience similar sensitivity to temperature (8.85 pm/ ° C). The potential applications of such sensors include continuous health monitoring where precise strain detection is required.

scholarly journals Low threshold Fabry-Perot optofluidic resonator fabricated by femtosecond laser micromachining

2016 ◽  
Vol 24 (15) ◽  
pp. 17416 ◽  
Author(s):  
F. Simoni ◽  
S. Bonfadini ◽  
P. Spegni ◽  
S. Lo Turco ◽  
D.E. Lucchetta ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Micromachining ◽  
Femtosecond Laser Micromachining ◽  
Fabry Perot ◽  
Low Threshold

scholarly journals Miniature Fabry-Perot Cavity Based on Fiber Bragg Gratings Fabricated by Fs Laser Micromachining Technique

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2505
Author(s):  
Luohao Lei ◽  
Hongye Li ◽  
Jing Shi ◽  
Qihao Hu ◽  
Xiaofan Zhao ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Specific Area ◽  
Bragg Gratings ◽  
Laser Micromachining ◽  
High Precision Measurement ◽  
Femtosecond Laser Micromachining ◽  
Fabry Perot ◽  
Fs Laser ◽  
First Time

Fabry-Perot cavity (FPC) based on Fiber Bragg gratings (FBGs) is an excellent candidate for fiber sensing and high-precision measurement. The advancement of the femtosecond laser micromachining technique provides more choices for the fabrication of FBGs-based FPCs. In this paper, we fabricate miniature FBGs-based FPCs, using the femtosecond laser line-by-line scanning writing technique for the first time. By this method, the FBGs can be limited to a specific area in the fiber core region. The grating length, position, and the distance between two successive FBGs can be conveniently controlled to achieve the desired transmission spectrum. For future applications in sensing, the temperature and strain responses of the fabricated FBGs-based FPCs were studied experimentally. This work provides a meaningful guidance for the fabrication and application of miniature FPCs based on FBGs.

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