Dimensions and refractive index estimates of deeply buried optical waveguides in lithium fluoride

Ismael Chiamenti, Francesca Bonfigli, Rosa Maria Montereali, Hypolito J. Kalinowski

Research output: Contribution to journalArticle

3 Citations (Scopus)


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. © 2014 SBMO/SBMag.
Original languageEnglish
Pages (from-to)47 - 54
Number of pages8
JournalJournal of Microwaves, Optoelectronics and Electromagnetic Applications
Issue number1
Publication statusPublished - 2014
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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