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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 21,
  • Issue 9,
  • pp. 1969-
  • (2003)

Vacuum-Ultraviolet Laser-Induced Refractive-Index Change and Birefringence in Standard Optical Fibers

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Abstract

Strong photosensitivity responses with the use of above-bandgap 157-nm F2-laser radiation are reported for standard germanosilicate fiber. A large 1.3 × 10-3 effective index change at 1.55 µm was inferred by trimming strong and weak Bragg gratings in hydrogen-free fiber. The F2-laser fluence-processing window of < 50~ mJ/cm2 is much lower than with traditional ultraviolet (UV) lasers. For hydrogen-soaked fiber, highly asymmetric refractive-index profiles were noted by atomic force microscopy and microreflection microscopy, yielding a peak index change of > 0.01 across a small 1-µm penetration depth at the fiber core. The index asymmetry appears to underlie the large > 5 × 10-5 value of laser-induced birefringence.

© 2003 IEEE

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