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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 34, Iss. 18 — Jun. 20, 1995
  • pp: 3436–3440

Photoinduced absorption change in germanosilicate preforms: evidence for the color-center model of photosensitivity

L. Dong, J. L. Archambault, L. Reekie, P. St. J. Russell, and D. N. Payne  »View Author Affiliations


Applied Optics, Vol. 34, Issue 18, pp. 3436-3440 (1995)
http://dx.doi.org/10.1364/AO.34.003436


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Abstract

A new technique has enabled us to resolve the strong UV absorption spectrum in UV-exposed germanosilicate preforms. Our results show, for the first time to our knowledge, that the large photoinduced absorption changes between 165 and 300 nm (~700 dB/mm at 195 nm has been observed) can account for ~3 × 10−4 of index change at 1.5 μm. The thermal-annealing dynamics of the photoinduced absorption changes also resemble those of fiber gratings, evidence that the color-center model of photosensitivity plays an important role in the photoinduced index changes in UV-written fiber gratings. We also find that the photoinduced absorption changes depend linearly on germania (i.e., germanium dioxide) concentrations in the preforms, and their exposure-time dependence can be fitted with a stretched-exponential function.

© 1995 Optical Society of America

History
Original Manuscript: June 22, 1994
Revised Manuscript: November 30, 1994
Published: June 20, 1995

Citation
L. Dong, J. L. Archambault, L. Reekie, P. St. J. Russell, and D. N. Payne, "Photoinduced absorption change in germanosilicate preforms: evidence for the color-center model of photosensitivity," Appl. Opt. 34, 3436-3440 (1995)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-34-18-3436

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