Nonlinear Conversion in Cavity-Resonator Integrated Grating Filters

In this manuscript, we review the recent progress made in nonlinear parametric conversion in grating-coupled Fabry-Pérot planar microcavities known as Cavity-Resonant Integrated Grating Filters (CRIGFs). Having previously established that enhanced second harmonic generation can be obtained in these devices, we discuss the design and experimental demonstrations of technical implementations allowing the achievement of critical coupling and improved conversion efficiencies.