Porous glass density tailoring by femtosecond laser pulses
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In this work, a new domain of femtosecond laser-induced densification was exploited as a method for space-selective control of porous glass matrix density. The estimated refractive index change (Δn) of laser-induced modified region shows a core-cladding structure with the Δn in the range of 10−4–10−2 depending on laser pulse energy and translating speed. The approximate linear relationship between glass matrix density vs Δn is theoretically proved by employing the Lorentz–Lorenz equation. Thus, the positive and negative Δn of modified region are interpreted as the densification and rarefaction of glass matrix, respectively.
KeywordsFemtosecond laser Porous glass Waveguide Refractive index change Glass matrix density
The reported study was financial supported by Russian Science Foundation (Project No. 19-79-10208). Zhong L. acknowledges the support from the China Scholarship Council (201708090140). R.Z. is grateful to Avesta Ltd. for the opportunity to work with the femtosecond laser.
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