Abstract
High power second harmonic generation (SHG) in MgO-doped LiNbO<sub>3</sub>
waveguides is investigated using a three-dimensional (3D) coupled thermo-optical
model. Simulations performed for a 1 111.6-nm fundamental laser show the influence
of the absorptions and the thermally induced dephasing on the conversion
efficiencies of the different waveguides. The onset of the thermally induced
dephasing effect for each waveguide is also indicated. As a result of high light
intensity in the waveguide, nonlinear absorptions are identified as the possible
main factors in efficiency losses in specific cases.
© 2011 Chinese Optics Letters
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