Abstract
We demonstrate large photoinduced core index change and inscription of strong Bragg gratings in As <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> optical fibre with transverse exposure to tunable CW laser light with photon energy near the absorption band edge.
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