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Modeling of the refractive index profile of a femtosecond written waveguide in LiNbO3
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Paper Abstract

Femtosecond laser pulse systems allows to modify in a precise and permanent way the optical properties of a transparent materials. This process enables the direct writing of guiding structures in materials, commonly known as waveguides, which are the base for optical circuit fabrication. It is our interest to study the main characteristics of the waveguides manufactured by the laser micromachining technique. Here, an analysis of the resulting refractive index profile has been carried out. This characteristic is essential for the design and simulation of integrated optical circuits. In particular we have developed our research on the study of light coupling in a pair of type II waveguides made in Lithium Niobate (LiNbO3). These experimental backgrounds provide us with elements to adjust and test the retrieved profile. Taking into account different distance between tracks and writing energies, it is well known that the coupling length changes and the coupling ratio too. Then this study allows us to reconstruct the refractive index profile according to its manufacturing conditions. Modeling of the refractive index distribution profile is a key parameter to perform beam propagation mode simulations (BPM) to achieve more realistic results. So, by means of this method it is possible to obtain a general procedure to describe the characteristics of these kinds of waveguides. As a model test, integrated waveguides were built to corroborate their light coupling. In a first stage it is designed through BPM simulations then it is manufactured in an X-cut LiNbO3 crystal in order to check its operation according to the simulations carried out.

Paper Details

Date Published: 9 September 2019
PDF: 8 pages
Proc. SPIE 11123, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIII, 111230Q (9 September 2019); doi: 10.1117/12.2528545
Show Author Affiliations
Damián A. Presti, Ctr. de Investigaciones Ópticas (Argentina)
Univ. Nacional de Quilmes (Argentina)
Valentín Guarepi, Ctr. de Investigaciones Ópticas (Argentina)
Univ. Nacional de La Plata (Argentina)
Fabián Videla, Ctr. de Investigaciones Ópticas (Argentina)
Univ. Nacional de La Plata (Argentina)
Gustavo A. Torchia, Ctr. de Investigaciones Ópticas (Argentina)
Univ. Nacional de La Plata (Argentina)


Published in SPIE Proceedings Vol. 11123:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIII
Shizhuo Yin; Ruyan Guo, Editor(s)

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