Dimensions and refractive index estimates of deeply buried optical waveguides in Lithium Fluoride

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...

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Bibliographic Details
Published in:Journal of Microwaves, Optoelectronics and Electromagnetic Applications Optoelectronics and Electromagnetic Applications, 2014-06, Vol.13 (1), p.47-54
Main Authors: Ismael Chiamenti, Francesca Bonfigli, Rosa Maria Montereali, Hypolito J. Kalinowski
Format: Article
Language:English
Subjects:
Core Dimension
Femtosecond Laser
Lithium Fluoride
Optical Waveguide
Refractive Index Increase
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Summary: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.
ISSN:2179-1074