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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 two consecutive unsymmetrical changes in the cladding thickness produced by MIR CO2 laser irradiation of a Corning SMF-28 fiber. (Cylindrical lens, exposure time 40 ms, 9 W laser power).
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f7-sensors-12-02654: Picture showing two consecutive unsymmetrical changes in the cladding thickness produced by MIR CO2 laser irradiation of a Corning SMF-28 fiber. (Cylindrical lens, exposure time 40 ms, 9 W laser power).

Mentions: Illustrative results are presented in Figures 5–7. The laser used is a 25 W maximum power CW CO2 laser (10.6 μm wavelength) electronically modulated, with exposure times in the order of a few hundreds of ms. Light was focused on the fiber by a 50 mm focal length spherical lens or by a 250 mm focal length cylindrical lens. The spot sizes are approximately 0.2 mm and 0.4 mm respectively, measured through the burn spot analysis method [11].


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 two consecutive unsymmetrical changes in the cladding thickness produced by MIR CO2 laser irradiation of a Corning SMF-28 fiber. (Cylindrical lens, exposure time 40 ms, 9 W laser power).
© Copyright Policy
Related In: Results  -  Collection

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

f7-sensors-12-02654: Picture showing two consecutive unsymmetrical changes in the cladding thickness produced by MIR CO2 laser irradiation of a Corning SMF-28 fiber. (Cylindrical lens, exposure time 40 ms, 9 W laser power).
Mentions: Illustrative results are presented in Figures 5–7. The laser used is a 25 W maximum power CW CO2 laser (10.6 μm wavelength) electronically modulated, with exposure times in the order of a few hundreds of ms. Light was focused on the fiber by a 50 mm focal length spherical lens or by a 250 mm focal length cylindrical lens. The spot sizes are approximately 0.2 mm and 0.4 mm respectively, measured through the burn spot analysis method [11].

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