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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 12 — Jun. 15, 2014
  • pp: 3398–3401

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

Juha-Matti Savolainen, Lars Grüner-Nielsen, Poul Kristensen, and Peter Balling  »View Author Affiliations

Optics Letters, Vol. 39, Issue 12, pp. 3398-3401 (2014)

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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.

© 2014 Optical Society of America

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2300) Fiber optics and optical communications : Fiber measurements
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 26, 2014
Revised Manuscript: May 2, 2014
Manuscript Accepted: May 2, 2014
Published: June 3, 2014

Juha-Matti Savolainen, Lars Grüner-Nielsen, Poul Kristensen, and Peter Balling, "Determination of femtosecond-laser-induced refractive-index changes in an optical fiber from far-field measurements," Opt. Lett. 39, 3398-3401 (2014)

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