Microchanneled Chirped Fiber Bragg Grating Formed by Femtosecond Laser-Aided Chemical Etching for Refractive Index and Temperature Measurements

Fu, Hongyan; Zhou, Kaiming; Saffari, Pouneh; Mou, Chengbo; Zhang, Lin; He, Sailing; Bennion, I.

doi:10.1109/lpt.2008.2002727

Cited by 12 publications

(9 citation statements)

References 7 publications

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“…3(b), where a good linear relationship with the linearity of 99.9% is obtained. The RI sensitivity obtained is ~994 nm/RIU, which is comparable to that of FPIs reported by other groups [1][2][3]7], superior to that of the fiber RI sensors based on fiber Bragg gratings [19,20], long-period fiber gratings [21] and conventional fiber interferometers [22][23][24], and much lower than that of the fiber open-cavity MZI, which reaches ~9370 nm/RIU [17]. This is due to the fact that for FPI, the sensitivity is inversely proportional to the RI value of the cavity medium, whereas for MZI, it is inversely proportional to the RI difference of the cavity medium and the fiber core, which is much smaller than the RI of the cavity medium itself.…”

Section: Resultssupporting

confidence: 79%

Optical fiber Fabry-Perot interferometer cavity fabricated by femtosecond laser micromachining and fusion splicing for refractive index sensing

Liao¹,

Hu²,

Wang³

2012

Opt. Express

233

104

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Abstract:We demonstrate a fiber in-line Fabry-Perot interferometer cavity sensor for refractive index measurement. The interferometer cavity is formed by drilling a micro-hole at the cleaved fiber end facet, followed by fusion splicing. A micro-channel is inscribed by femtosecond laser micromachining to vertically cross the cavity to allow liquid to flow in. The refractive index sensitivity obtained is ~994 nm/RIU (refractive index unit). Such a device is simple in configuration, easy for fabrication and reliable in operation due to extremely low temperature cross sensitivity of ~4.8 × 10

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Section: Resultssupporting

confidence: 79%

Optical fiber Fabry-Perot interferometer cavity fabricated by femtosecond laser micromachining and fusion splicing for refractive index sensing

Liao¹,

Hu²,

Wang³

2012

Opt. Express

233

104

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“…High sensitivity to alignment is also reported [7,52] as one of the major drawbacks in fs-NIR technique regarding LPFGs, not only using masks but also in point-by-point writing. Nevertheless, the latter technique is being researched towards its application in the development of non-uniform (or "chirped") Bragg gratings [53] and direction-sensitive bending sensors [54].…”

Section: Multi-photonic Nir Laser Writing Of Fg Sensorsmentioning

confidence: 99%

Advances in Optical Fiber Laser Micromachining for Sensors Development

Coelho¹,

Nespereira²,

Silva³

et al. 2013

Current Developments in Optical Fiber Technology

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/52745. Introduction "oth lasers and optical fibers technology appeared in the s, being, from the start, close related. Even though the latter gained increased visibility in telecommunications, first experiments using optical fiber sensors are reported from early s. From then on, research in optical fiber sensors has increased taking advantage of their potential when comparing with traditional sensors. "lthough there are many well established techniques to manufacture optical fiber sensors, the use of laser technology as increased as their cost diminishes at least for older, well matured laser sources technology and new laser sources appeared. This new tool has the advantage of producing well controlled light beams.Nowadays, laser processing of optical fibers in the production of fiber-based sensors is an important research theme. In particular, the use of infrared radiation has directed attention as new applications were found and new short pulsed laser technology have been developed. In this chapter we will describe the main technology used and the physical principles involved. The key parameters in laser radiation interaction with the fiber materials will be described as well as the most common types of fiber-based sensors that can be produced. The application of ultraviolet UV , near-infrared NIR and mid-infrared MIR radiation in the fabrication of fiber grating FG sensors is analysed. The physical principles are described and a comparison between theoretical modelling and experimental results is presented for MIR radiation writing of long-period fiber sensors LPFG . Micromachining with nanosecond ns pulsed near-infrared laser radiation is presented and illustrate an ongoing research in the use of this type of laser to produce new cavity-based optical sensors. Experimental work is presented and its potential application is analysed. . Laser interaction with optical fiber materialsLaser interaction with the materials in general and optical fiber material in particular, depends on several parameters. These are related with the laser source its wavelength and emission regime, mainly and also on the characteristics of the material itself.Generally speaking, the common fibers used as sensors are made of glass materials. "lthough plastic and polymeric materials are also used, usually sensors are produced from fibers made of ultra pure chemicals like silicon tetrachloride SiCl , germanium tetrachloride GeCl and also phosphorus oxychloride POCl . The improvement of their optical properties is accomplished by doping with germanium, erbium and ytterbium among other rare earths. Nevertheless, in the purpose of this chapter, fused silica pure or doped will be considered as the typical bulk material for laser interaction regarding fiberbased optical sensors.The most common lasers emit either in the UV, visible or infrared IR . However, UV and IR lasers have been the major players in the field of processing optical fibers given that th...

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“…With the development of femtosencond laser (fs), based on fs micro-machine technique, the researchers have achieved a series of micro-structures in an optical fiber [12]. In our previous works, we have successfully achieved micro-holes and micro-slots in optical fibers by fs laser inscription assisted chemical etching [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel

et al. 2012

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We report a linear response optical refractive index (RI) sensor, which is fabricated based on a micro-channel created within a Fabry Perot (F-P) cavity by chemical etching assisted by femtosecond laser inscription. The experimental results show the F-P resonance peak has a linear response with the RI of medium and the measuring sensitivity is proportion to the length of micro-channel. The sensor with 5 μm-long micro-channel exhibited an RI sensitivity of 1.15nm/RIU and this sensitivity increased to 9.08nm/RIU when widening the micro-channel to 35μm. Furthermore, such micro-channel FP sensors show a much broader RI sensing dynamic range (from 1.3 to 1.7) than other reported optical fiber sensors.

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Microchanneled Chirped Fiber Bragg Grating Formed by Femtosecond Laser-Aided Chemical Etching for Refractive Index and Temperature Measurements

Cited by 12 publications

References 7 publications

Optical fiber Fabry-Perot interferometer cavity fabricated by femtosecond laser micromachining and fusion splicing for refractive index sensing

Optical fiber Fabry-Perot interferometer cavity fabricated by femtosecond laser micromachining and fusion splicing for refractive index sensing

Advances in Optical Fiber Laser Micromachining for Sensors Development

Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel

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