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Hans Georg Limberger

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Publications associées (43)

Distributed strain measurements using fiber Bragg gratings in small-diameter optical fiber and low-coherence reflectometry

Hans Georg Limberger, John Botsis, Dragan Coric, Marco Lai, Aiping Luo

Optical low coherence reflectometry and fiber Bragg gratings written in small diameter (50 micrometer) optical fibers were used for measurements of non-homogenous internal strain fields inside an epoxy specimen with sub-grating length resolution. The resul ...

Optical Society of America2010

Fabrication of fiber Bragg gratings in 40 mm diameter low GeO2 silica fiber using cw-Ar+-laser

Hans Georg Limberger, Georgios Violakis

Mean index changes >10-3 were obtained in non-hydrogen-loaded 3% GeO2-doped silica fibers with a 9/40 micrometer core/cladding diameter using a cw 244-nm-Ar+-laser. Core stress changes are positive indicating a compaction contribution to the index change. ...

Optical Society of America2010

Influence of Humidity and Temperature on Polymer Optical Fiber Bragg Gratings

Hans Georg Limberger, René Salathé, Nico Gérard Harbach

Water sorption of 100% changes the POFBG peak wavelength by 8.1 nm (at 1.54 micrometer). The temperature sensitivity depends on water content and is -10, -34, and -138 pm/K in dry, wet, and ambient conditions. ...

2010

Formation of Bragg gratings in pristine SMF-28e fibre using cw 244-nm Ar+-laser

Hans Georg Limberger, Georgios Violakis

The formation of short Bragg gratings in SMF-28e non-hydrogen loaded pristine fibre using a cw Ar+ laser operating at 244 nm is reported. Mean refractive index changes >10-3 were obtained for a laser intensity of about 513 W/cm2 and a total dose of 5.9 MJ/ ...

Institution of Engineering and Technology2010

Infrared Luminescence Enhancement by UV-Irradiation of H2-loaded Bi-Al-doped Fiber

Hans Georg Limberger, Christian Ban

ArF excimer laser irradiation of H2-loaded fibers increases the intensity of both the 1130 and 1390 nm fluorescence in Bi-Al-doped silica fiber by 18 dB and >16 dB. ...

2009

UV induced fiber Bragg gratings (FBG) written in fully polymerized polymer optical fibers (POF)

Hans Georg Limberger, René Salathé, Nico Gérard Harbach

2007

Ultrawide bandwidth wavelength monitor based on a pair of tilted fiber Bragg gratings

Hans Georg Limberger, René Salathé

A wavelength monitor based on a pair of tilted fiber Bragg gratings is reported. The monitor exhibits a subpicometer wavelength selectivity over a broad wavelength range (> 30 nm), and a low insertion loss (< 1 dB) for laser light with polarization matchin ...

Institute of Electrical and Electronics Engineers2007

Low loss wavelength monitor with sub-picometer resolution based on tilted fiber gratings

Hans Georg Limberger, René Salathé

A wavelength monitor based on a pair of tilted fiber Bragg gratings with low insertion loss (<1 dB) and sub-picometer wavelength resolution is reported. ...

IEEE2007

Light-controlled reconfigurable fiber bragg gratings written in attenuation fiber

Hans Georg Limberger, René Salathé, Rodrigue Chatton, Yari Luchessa, Dragan Coric

A novel type of light controlled fiber Bragg gratings written in attenuation fiber is demonstrated. The spectral reconfiguration can be controlled by the pump power, the pumping configuration, the grating position and the fiber attenuation. © Optical Socie ...

Institute of Electrical and Electronics Engineers Computer Society2007

Buried channel waveguides in Yb-doped KY(WO4)2 crystals fabricated by femtosecond laser irradiation

Hans Georg Limberger, René Salathé, Camelia Borca

Elsevier2007

Reliability of optical fiber components, devices, systems, and networks III

Hans Georg Limberger

Society of Photo-optical Instrumentation Engineers (United States)2006

An all-fiber Pr/Yb-doped up-conversion laser in different laser operation modes

Marcel Zeller, Hans Georg Limberger, Theo Lasser

Fiber laser systems have the potential to represent an interesting alternative to more conventional laser sources emitting in the visible spectral range. In this contribution we present new results based on fluoride Pr/Yb- doped fiber systems. This Pr/Yb-d ...

2006

Strong asymmetric stresses arc-induced in pre-annealed nitrogen-doped fibres

Hans Georg Limberger, Florian Dürr

2006

Distributed measurements of fiber birefringence and diametric load using optical low-coherence reflectometry and fiber gratings

Hans Georg Limberger, René Salathé, Dragan Coric

Optical Society of America2006

In situ strain and temperature monitoring of adaptive composite material

Hans Georg Limberger, René Salathé, Véronique Michaud

An optical fiber sensor is designed to simultaneously measure strain and temperature in an adaptive composite material. The sensor is formed by splicing two fiber Bragg gratings (FBGs) close to each other, which are written in optical fibers with different ...

SAGE Publications2006

High resolution liquid-level sensor based on fiber Bragg gratings in attenuation fiber and optical low-coherence reflectometry

Hans Georg Limberger, René Salathé, Rodrigue Chatton, Dragan Coric

2006

Annealing-induced stress changes in UV-irradiated germanium-doped fibers

Hans Georg Limberger, René Salathé, Florian Dürr

2005

UV-induced index changes in undoped fluoride glass

Marcel Zeller, Hans Georg Limberger, Theo Lasser

Undoped fluoride glass slides have been exposed to pulsed 193-nm ultraviolet (UV) irradiation. Their absorption changes have been measured to evaluate UV-induced index changes using Kramers-Kronig relation. A layer-peeling polishing technique was applied t ...

IEEE Institute of Electrical and Electronics Engineers2005

Polarization microscopy by use of digital holography: application to optical- fiber birefringence measurements

Tristan Colomb, Etienne Cuche, Christian Depeursinge, Hans Georg Limberger, René Salathé, Pierre Marquet, Florian Dürr

We present a digital holographic microscope that permits one to image polarization state. This technique results from the coupling of digital holographic microscopy and polarization digital holography. The interference between two orthogonally polarized re ...

2005

Stress profiling of arc-induced long-period gratings written in pure-silica-core fibers

Hans Georg Limberger, Florian Dürr

2005

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