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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.


Example of two holes opened on the lateral side of a Corning SMF-28 fiber by multiple-pulse irradiation with a focused NIR laser beam. (a) Front and (b) lateral views taken with an optical microscope. (20 pulses with 3 mJ/pulse).
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f11-sensors-12-02654: Example of two holes opened on the lateral side of a Corning SMF-28 fiber by multiple-pulse irradiation with a focused NIR laser beam. (a) Front and (b) lateral views taken with an optical microscope. (20 pulses with 3 mJ/pulse).

Mentions: Tests demonstrated that the achieved depth has a direct relation with the number of pulses, about 1 μm depth per pulse [27]. It also turned out that neither moving the fiber after each pulse (towards the focusing lens) nor changing the beam size on the focusing lens (but keeping the fluence constant) has major influence on the results. Changing the beam’s energy between 1 mJ and 2.5 mJ was shown to increase the hole diameter on top of the fiber by about 5 μm but not significantly altering its depth (considering the associated measurement errors). Figure 11 shows the results for lateral laser shooting with the same beam parameters.


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)

Example of two holes opened on the lateral side of a Corning SMF-28 fiber by multiple-pulse irradiation with a focused NIR laser beam. (a) Front and (b) lateral views taken with an optical microscope. (20 pulses with 3 mJ/pulse).
© Copyright Policy
Related In: Results  -  Collection

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

f11-sensors-12-02654: Example of two holes opened on the lateral side of a Corning SMF-28 fiber by multiple-pulse irradiation with a focused NIR laser beam. (a) Front and (b) lateral views taken with an optical microscope. (20 pulses with 3 mJ/pulse).
Mentions: Tests demonstrated that the achieved depth has a direct relation with the number of pulses, about 1 μm depth per pulse [27]. It also turned out that neither moving the fiber after each pulse (towards the focusing lens) nor changing the beam size on the focusing lens (but keeping the fluence constant) has major influence on the results. Changing the beam’s energy between 1 mJ and 2.5 mJ was shown to increase the hole diameter on top of the fiber by about 5 μm but not significantly altering its depth (considering the associated measurement errors). Figure 11 shows the results for lateral laser shooting with the same beam parameters.

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.