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.
|Pages (from-to)||47 - 54|
|Number of pages||8|
|Journal||Journal of Microwaves, Optoelectronics and Electromagnetic Applications|
|Publication status||Published - 2014|
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
Chiamenti, I., Bonfigli, F., Montereali, R. M., & Kalinowski, H. J. (2014). Dimensions and refractive index estimates of deeply buried optical waveguides in lithium fluoride. Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 13(1), 47 - 54. https://doi.org/10.1590/S2179-10742014000100004