Determination of femtosecond-laser-induced refractive-index changes in an optical fiber from far-field measurements

Determination of femtosecond-laser-induced refractive-index changes in an optical fiber from far-field measurements

A new method for direct writing of localized, circularly symmetric refractive-index changes in optical fibers with a femtosecond laser is demonstrated. The refractive-index changes are characterized using a novel approach employing comparison of numerical simulations to the measured far-field profil...

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Veröffentlicht in:Optics letters 2014-06, Vol.39 (12), p.3398-3401
Hauptverfasser: Savolainen, Juha-Matti, Grüner-Nielsen, Lars, Kristensen, Poul, Balling, Peter
Format: Artikel
Sprache:eng
Schlagworte:
Circularity
Computer simulation
Femtosecond
Fibers
Lasers
Mathematical models
Optical fibers
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Beschreibung
Zusammenfassung:A new method for direct writing of localized, circularly symmetric refractive-index changes in optical fibers with a femtosecond laser is demonstrated. The refractive-index changes are characterized using a novel approach employing comparison of numerical simulations to the measured far-field profiles of unmodified and modified fibers. From the analysis, a negative refractive-index change of -0.015±0.005 within a radius of (0.6±0.1)  μm is determined.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.003398