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Journal of Microwaves, Optoelectronics and Electromagnetic Applications

versão On-line ISSN 2179-1074

Resumo

CHIAMENTI, Ismael; BONFIGLI, Francesca; MONTEREALI, Rosa Maria  e  KALINOWSKI, Hypolito J.. Dimensions and refractive index estimates of deeply buried optical waveguides in Lithium Fluoride. J. Microw. Optoelectron. Electromagn. Appl. [online]. 2014, vol.13, n.1, pp.47-54. ISSN 2179-1074.  https://doi.org/10.1590/S2179-10742014000100004.

A recursive procedure is applied to the measured near-field profiles of buried optical waveguides recorded in a lithium fluoride (LiF) crystal by femtosecond laser pulses in order to estimate the core dimensions and the refractive index increase. Albeit the waveguides transversal section geometry is quite complex it is possible to obtain the horizontal and vertical widths and the average refractive index maximum increase assuming a simplified rectangular transversal section in the simulation. The procedure is validated by comparing the simulated results with the experimental near-field profiles and the maximum refractive index values of two commercial optical fibers. Typical dimensions of ~(8x10)µm2 and refractive index changes of ~(2-10)x10-4 were obtained for the LiF waveguides at several wavelengths.

Palavras-chave : Refractive Index Increase; Core Dimension; Optical Waveguide; Lithium Fluoride; Femtosecond Laser.

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