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SEM picture of the multilayer waveguide. The nonconventional transverse profile, which is a signature of the anisotropy of chemical etching, is longitudinally invariant and therefore affects by no means the optical losses.
PF spectra at degeneracy (solid line) and off degeneracy (dotted line). Inset: tuning curve (experimental points and fitting curve). Because of detector cutoff, data points beyond are inferred from frequency conservation.
PF power vs pump power at degeneracy.
SHG phase-matching curve vs waveguide temperature, for a FF wavelength of . Inset: experimental setup scheme, where output FF (SH) is measured with an InGaAs (Si) calibrated photodiode and lock-in amplification.
SH vs FF power: experimental data (circles) and quadratic fit (solid line).
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