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LOLS research in technology for the development and application of new fiber-based sensors.

Coelho J, Nespereira M, Silva C, Rebordão J - Sensors (Basel) (2012)

Bottom Line: This paper presents the research made at the Laboratory of Optics, Lasers and Systems (LOLS) of the Faculty of Sciences of University of Lisbon, Portugal, in the field of fiber-based sensors.Three areas are considered: sensor encapsulation for natural aqueous environments, refractive index modulation and laser micropatterning.We present the main conclusions on the issues and parameters to take in consideration for the encapsulation process and results of its design and application.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Faculty of Sciences, University of Lisbon, Lisboa, Portugal. joao.coelho@fc.ul.pt

ABSTRACT
This paper presents the research made at the Laboratory of Optics, Lasers and Systems (LOLS) of the Faculty of Sciences of University of Lisbon, Portugal, in the field of fiber-based sensors. Three areas are considered: sensor encapsulation for natural aqueous environments, refractive index modulation and laser micropatterning. We present the main conclusions on the issues and parameters to take in consideration for the encapsulation process and results of its design and application. Mid-infrared laser radiation was applied to produce long period fiber gratings and nanosecond pulses of near-infrared Q-switch laser were used for micropatterning.

No MeSH data available.


Related in: MedlinePlus

Picture showing (a) two consecutive irradiated areas with symmetrical change in the cladding thickness and (b) a zoom of one of zones. (Spherical lens, exposure time 400 ms, 1 W laser power).
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f6-sensors-12-02654: Picture showing (a) two consecutive irradiated areas with symmetrical change in the cladding thickness and (b) a zoom of one of zones. (Spherical lens, exposure time 400 ms, 1 W laser power).

Mentions: While Figure 5 shows two consecutive refractive index changes with minimum cladding thickness change, Figures 6 and 7 shows the occurrence of symmetric and unsymmetrical changes, respectively. These two latter cases result from a balance between laser power and pulse in order to achieve melting, thus creating tapers or grooves along the fiber (i.e., zones were the cladding diameter is reduced). In these cases, based on what was reported by Wang et al. [12], we do not expect a large insertion loss because the groves are generated in the outer cladding and do not influence the light transmitted by the core.


LOLS research in technology for the development and application of new fiber-based sensors.

Coelho J, Nespereira M, Silva C, Rebordão J - Sensors (Basel) (2012)

Picture showing (a) two consecutive irradiated areas with symmetrical change in the cladding thickness and (b) a zoom of one of zones. (Spherical lens, exposure time 400 ms, 1 W laser power).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376623&req=5

f6-sensors-12-02654: Picture showing (a) two consecutive irradiated areas with symmetrical change in the cladding thickness and (b) a zoom of one of zones. (Spherical lens, exposure time 400 ms, 1 W laser power).
Mentions: While Figure 5 shows two consecutive refractive index changes with minimum cladding thickness change, Figures 6 and 7 shows the occurrence of symmetric and unsymmetrical changes, respectively. These two latter cases result from a balance between laser power and pulse in order to achieve melting, thus creating tapers or grooves along the fiber (i.e., zones were the cladding diameter is reduced). In these cases, based on what was reported by Wang et al. [12], we do not expect a large insertion loss because the groves are generated in the outer cladding and do not influence the light transmitted by the core.

Bottom Line: This paper presents the research made at the Laboratory of Optics, Lasers and Systems (LOLS) of the Faculty of Sciences of University of Lisbon, Portugal, in the field of fiber-based sensors.Three areas are considered: sensor encapsulation for natural aqueous environments, refractive index modulation and laser micropatterning.We present the main conclusions on the issues and parameters to take in consideration for the encapsulation process and results of its design and application.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Faculty of Sciences, University of Lisbon, Lisboa, Portugal. joao.coelho@fc.ul.pt

ABSTRACT
This paper presents the research made at the Laboratory of Optics, Lasers and Systems (LOLS) of the Faculty of Sciences of University of Lisbon, Portugal, in the field of fiber-based sensors. Three areas are considered: sensor encapsulation for natural aqueous environments, refractive index modulation and laser micropatterning. We present the main conclusions on the issues and parameters to take in consideration for the encapsulation process and results of its design and application. Mid-infrared laser radiation was applied to produce long period fiber gratings and nanosecond pulses of near-infrared Q-switch laser were used for micropatterning.

No MeSH data available.


Related in: MedlinePlus