Role of the La/K Compositional Ratio in the Properties of Waveguides Written by Fs-Laser Induced Element Redistribution in Phosphate-Based Glasses

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Moreno-Zarate, Pedro and Muñoz, Francisco and Sotillo Buzarra, Belén and Macias-Montero, Manuel and Atienzar, Julia and Garcia-Pardo, Marina and Fernández Sánchez, Paloma and Serna, Rosalia and Solis, Javier (2020) Role of the La/K Compositional Ratio in the Properties of Waveguides Written by Fs-Laser Induced Element Redistribution in Phosphate-Based Glasses. Materials, 13 (6). p. 1275. ISSN 1996-1944

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Official URL: https://doi.org/10.3390/ma13061275




Abstract

The local modification of the composition of glasses by high repetition femtosecond laser irradiation is an attractive method for producing photonic devices. Recently, the successful production of waveguides with a refractive index contrast (Δn) above 10−2 by fs-laser writing has been demonstrated in phosphate glasses containing La2O3 and K2O modifiers. This large index contrast has been related to a local enrichment in lanthanum in the light guiding region accompanied by a depletion in potassium. In this work, we have studied the influence of the initial glass composition on the performance of waveguides that are produced by fs-laser induced element redistribution (FLIER) in phosphate-based samples with different La and K concentrations. We have analyzed the contribution to the electronic polarizability of the different glass constituents based on refractive index measurements of the untreated samples, and used it to estimate the expected index contrast caused by the experimentally measured local compositional changes in laser written guiding structures. These estimated values have been compared to experimental ones that are derived from near field images of the guided modes with an excellent agreement. Therefore, we have developed a method to estimate before-hand the expected index contrast in fs-laser written waveguides via FLIER for a given glass composition. The obtained results stress the importance of considering the contribution to the polarizability of all the moving species when computing the expected refractive index changes that are caused by FLIER processes.


Item Type:Article
Uncontrolled Keywords:fs-laser writing; photonic devices; glass; ion migration; element redistribution; waveguides; refractive index contrast
Subjects:Sciences > Physics > Materials
ID Code:65349
Deposited On:12 May 2021 14:14
Last Modified:12 May 2021 14:23

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