Reflective Optical Fiber Sensors Based on Tilted Fiber Bragg Gratings Fabricated With Femtosecond Laser

2013 ◽  
Vol 31 (3) ◽  
pp. 455-460 ◽  
Author(s):  
Chao Chen ◽  
Yong-Sen Yu ◽  
Rui Yang ◽  
Chuang Wang ◽  
Jing-Chun Guo ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Optical Fiber Sensors ◽  
Fiber Sensors

Optical Fibers on Medical Instrumentation

2013 ◽  
Vol 2 (2) ◽  
pp. 23-36
Author(s):  
J. P. Carmo ◽  
J. E. Ribeiro
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
State Of The Art ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Optical Fiber Sensors ◽  
The State ◽  
Medical Instrumentation ◽  
Fiber Sensors

This paper provides a revision with the state-of-the-art related to the use of optical fiber sensors on medical instrumentation. Two types of optical fiber sensors are the focus of review: conventional optical fibers for communications and fiber Bragg gratings (FBGs).

Fabrication of Optical Fiber Sensors Based on Femtosecond Laser Micro Machining

2020 ◽  
Vol 8 (4) ◽  
Author(s):  
Fengfeng Zhou ◽  
Seunghwan Jo ◽  
Xingyu Fu ◽  
Jung-Ting Tsai ◽  
Martin Byung-Guk Jun
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Refractive Index Change ◽  
Optical Fiber Sensors ◽  
Objective Lens ◽  
Machining Parameters ◽  
Fiber Sensors ◽  
The Core ◽  
First Time

Abstract In this research, we proposed fabrication process of optical fiber sensors using femtosecond laser and their applications. A beam of femtosecond laser was focused by an objective lens in the optical fiber. By testing different conditions, a group of machining parameters was found that achieve a minimum machining resolution of 3.2 μm. To ablate the core of the optical fiber, which is buried deep inside the cladding, precisely, part of the cladding was removed to expose the core as close as possible to the air. By making a complex pattern to modify the optical path of the laser inside an optical fiber, a sensitivity of 942.8–1015.6 nm per refractive index unit (nm/RIU) was obtained for liquid refractive index sensing. For another sensor, a sensitivity of 1.38 × 105 nm/RIU was obtained, which is high enough to detect small amount of refractive index change of air. It is known to be the first time that we fabricated a complex microstructure in an optical fiber to modify the propagation of the light using femtosecond laser. This research shows the possibility of a complex modification of light in an optical fiber using laser machining.

Quantitative morphology of femtosecond laser-written point-by-point optical fiber Bragg gratings

2021 ◽  
Author(s):  
Saurabh Bhardwaj ◽  
Toney Fernandez ◽  
Simon Gross ◽  
Michael Withford ◽  
Michael Steel
Keyword(s):  
Femtosecond Laser ◽  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Quantitative Morphology

scholarly journals Optical Fiber Sensors by Direct Laser Processing: A Review

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6971
Author(s):  
David Pallarés-Aldeiturriaga ◽  
Pablo Roldán-Varona ◽  
Luis Rodríguez-Cobo ◽  
José Miguel López-Higuera
Keyword(s):  
Femtosecond Laser ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Laser Processing ◽  
Optical Fiber Sensors ◽  
Femtosecond Laser Irradiation ◽  
Fiber Sensors ◽  
Continuous Increase ◽  
Rayleigh Backscattering ◽  
Direct Laser

The consolidation of laser micro/nano processing technologies has led to a continuous increase in the complexity of optical fiber sensors. This new avenue offers novel possibilities for advanced sensing in a wide set of application sectors and, especially in the industrial and medical fields. In this review, the most important transducing structures carried out by laser processing in optical fiber are shown. The work covers different types of fiber Bragg gratings with an emphasis in the direct-write technique and their most interesting inscription configurations. Along with gratings, cladding waveguide structures in optical fibers have reached notable importance in the development of new optical fiber transducers. That is why a detailed study is made of the different laser inscription configurations that can be adopted, as well as their current applications. Microcavities manufactured in optical fibers can be used as both optical transducer and hybrid structure to reach advanced soft-matter optical sensing approaches based on optofluidic concepts. These in-fiber cavities manufactured by femtosecond laser irradiation followed by chemical etching are promising tools for biophotonic devices. Finally, the enhanced Rayleigh backscattering fibers by femtosecond laser dots inscription are also discussed, as a consequence of the new sensing possibilities they enable.

Flexible Force Sensors Using Fiber Bragg Grating

2006 ◽  
Vol 326-328 ◽  
pp. 1343-1346
Author(s):  
Jin Seok Heo ◽  
Jong Ha Cheung ◽  
Jung Ju Lee
Keyword(s):  
Optical Fiber ◽  
Normal Force ◽  
Fiber Bragg Gratings ◽  
Tactile Sensor ◽  
Optical Fiber Sensors ◽  
Force Sensors ◽  
Fiber Sensors ◽  
Light Loss ◽  
Bridge Type ◽  
Type Transducer

In this paper, we present a newly designed flexible optical fiber force sensors which use fiber Bragg gratings and diaphragm and bridge type transducer, to detect a distributed normal force and which is the first step toward realizing a tactile sensor using optical fiber sensors (FBG). The transducer is designed such that it is not affected by chirping and light loss to enhance the performance of the sensors. We also present the design and fabrication process and experimental verification of the prototype sensors.

Active Optical Fiber Sensors Enabled By Femtosecond Laser Induced Nano-Scattering Centers

2021 ◽  
Author(s):  
Kehao Zhao ◽  
Mohan Wang ◽  
Sheng Huang ◽  
Zhaoqiang Peng ◽  
Kevin P. Chen
Keyword(s):  
Femtosecond Laser ◽  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Fiber Sensors ◽  
Scattering Centers

scholarly journals Properties of Specialist Fibres and Bragg Gratings for Optical Fiber Sensors

2009 ◽  
Vol 2009 ◽  
pp. 1-17 ◽  
Author(s):  
John Canning
Keyword(s):  
Optical Fiber ◽  
Optical Fibre ◽  
Bragg Gratings ◽  
Optical Fiber Sensors ◽  
Optical Fibres ◽  
Research Directions ◽  
Fiber Sensors ◽  
Optical Fibre Sensors ◽  
New Directions ◽  
Temperature Strain

The advent of optical fibres based on air holes running along their entirety opens up new directions in addressing various properties relevant to sensing, including the temperature/strain challenge of optical fibre sensors. This paper looks at the measurement challenges associated with temperature and strain, examines the potentially unique functionality structured fibre designs with and without gratings open up, and briefly describes some current research directions within conventional fibre and grating technologies.

Features of Femtosecond Micromachining of Solid Transparent Materials

2021 ◽  
Vol 316 ◽  
pp. 993-998
Author(s):  
Anton S. Chernikov ◽  
Ruslan V. Chkalov
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Spectral Characteristics ◽  
Fiber Bragg Gratings ◽  
Single Mode ◽  
Bragg Gratings ◽  
Femtosecond Laser Radiation ◽  
Third Order ◽  
Correction System

The paper reports the inscription of second- and third-order fiber Bragg gratings (FBGs) in single-mode optical fiber (SMF-28e+) via the line-by-line (LbL) and the point-by-point (PbP) methods using femtosecond laser radiation. The use of these methods jointly with based on an automatic spatial deviation correction system is considered. The approach allows to significantly improve spectral characteristics of FBG without the loss of fabrication performance.

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