Mechanism of femtosecond-laser induced refractive index change in phosphate glass under a low repetition-rate regime

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Abstract

Raman microscopy and refractive near-field profilometry were used to analyze waveguides written in Yb-doped Kigre QX glass under the low repetition-rate (noncumulative-heating) regime. It was found that femtosecond-laser induced refractive index change was due to an increase in the proportion of Q1 P-tetrahedra and the associated increase in the polarizability of the glass. The role of color center formation and removal in this process is clearly defined, phosphorous-oxygen hole centers (POHCs) and PO3- ions form as a result of P-O bonds being broken during the modification process, and the subsequent removal of POHCs give rise to the increased proportion of Q1 P-tetrahedra. This result, when compared to other studies undertaken in the cumulative-heating regime, show conclusively that the mechanism of refractive index change in a particular type of glass can be very different, depending on the irradiation conditions.

Original languageEnglish
Article number033110
Pages (from-to)033110-1-033110-5
Number of pages5
JournalJournal of Applied Physics
Volume108
Issue number3
DOIs
Publication statusPublished - 1 Aug 2010

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