Fibre optics

On the mechanism of photoinduced refractive index changes in phosphosilicate glass

Yu. V. Larionov^a, V. O. Sokolov^b, V. G. Plotnichenko<sup>b

a</sup> Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^b Fiber Optics Research Center of the Russian Academy of Sciences, Moscow

Abstract: The photoinduced growth of the refractive index of phosphosilicate glass during Bragg grating inscription and the thermal decay of the grating have a number of unusual features. The observed index variations are interpreted in terms of a new model for photoinduced glass network rearrangement. The model assumes the formation of photoinduced voids (nanopores) in the glass network near point defects. The nanopores may migrate through the network via bond switching when the network is in a "soft" state. The photoinduced variations in network density lead to index variations.

PACS: 42.81.Cn, 42.70.Nq, 42.25.Gy

Received: 30.03.2009
Revised: 11.02.2010

 English version: Quantum Electronics, 2010, 40:3, 264–268

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