Abstract
We report on a method for the simultaneous determination of refractive
index profiles and mode indices from the measured near-field intensity
profiles of optical waveguides. This method has been applied to UV-written
single-mode optical waveguides in ${\hbox {LiNbO}}_{3}$ for the optimization of the writing conditions. The results for
the waveguides written with light of the wavelengths 275, 300.3, 302, and
305 nm for different writing powers and scan speeds reveal that for optimum
writing conditions a maximum possible refractive index change of $\sim$0.0026 can be achieved at a value of 632.8 nm transmitting
wavelength. The computation process used in the presented technique may also
become useful to extract absolute refractive index values of any slowly
varying graded index waveguide.
© 2009 IEEE
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