Fig. 3: Reconfiguration of the nonlinear interaction.
From: Ultrabroadband milliwatt-level resonant frequency doubling on a chip
A SHG traces obtained by ramping down the north heater power (i.e., slowly blue-shifting the north ring SH resonance). Each trace corresponds to a different detuning \({\delta }_{{{\rm{p}}}}={\lambda }_{{{\rm{res}}}}-{\lambda }_{{{\rm{pump}}}}\) of the pump laser from the hot cavity resonance at its maximal shift. The asymmetric lineshape is attributed to the presence of thermal shift in the north resonator. B SHG power scaling measurement and quadratic fit. C High resolution SHG map at in the cold cavity regime after inscription of the nonlinear grating. Here the pump power is kept low (0.2 mW) to prevent thermal shifts as well as the triggering the AOP process. The red and blue dashed lines highlight respectively the pump and SH resonance peaks, which red-shift for increasing north heater power. The peak values are plotted in (D, E) and fitted with a Lorentzian and squared Lorentzian function respectively (black solid line).
