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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 1, Iss. 1 — May. 1, 2011
  • pp: 121–127

Non-monotonous refractive index changes recorded in a phosphate glass optical fibre using 248nm, 500fs laser radiation

Michele Sozzi, Aashia Rahman, and Stavros Pissadakis  »View Author Affiliations

Optical Materials Express, Vol. 1, Issue 1, pp. 121-127 (2011)

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Results are presented on the photosensitivity behavior of a phosphate glass optical fibre using 248nm, 500fs laser radiation. Bragg grating exposures performed using a double phase mask interferometer and peak intensities of 0.37TW/cm2, revealed that grating growth becomes non-monotonic in terms of average and modulated refractive index changes, resembling the Type IIA photosensitivity behavior. Average refractive index changes greater than 10−3 were measured after accumulated energy density doses of 6.5KJ/cm2. The Bragg gratings inscribed maintained significant part of their strength up to 377°C. Exposed and side-polished fibre samples were subjected to Knoop micro-hardness measurements for revealing that the irradiated glass undergoes significant volume dilation.

© 2011 OSA

OCIS Codes
(060.2290) Fiber optics and optical communications : Fiber materials
(160.2750) Materials : Glass and other amorphous materials
(060.3738) Fiber optics and optical communications : Fiber Bragg gratings, photosensitivity

ToC Category:
Materials for Fiber Optics

Original Manuscript: February 3, 2011
Revised Manuscript: March 23, 2011
Manuscript Accepted: March 29, 2011
Published: April 22, 2011

Michele Sozzi, Aashia Rahman, and Stavros Pissadakis, "Non-monotonous refractive index changes recorded in a phosphate glass optical fibre using 248nm, 500fs laser radiation," Opt. Mater. Express 1, 121-127 (2011)

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