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Quasi-phase-matching for efficient backward second-harmonic generation (BSHG)requires sub-$\rm\mu$m poling periods, a non-trivial fabrication feat. For thefirst time, we report integrated first-order quasi-phase-matched BSHG enabledby seeded all-optical poling. The self-organized grating inscriptioncircumvents all fabrication challenges. We compare backward and forwardprocesses and explain how grating period influences the conversion efficiency.These results showcase unique properties of the coherent photogalvanic effectand how it can bring new nonlinear functionalities to integrated photonics.

Integrated Backward Second-Harmonic Generation Through Optically Induced Quasi-Phase Matching