Ledoux-Rak works on molecular and polymer nonlinear optics - second-harmonic generation, electro-optic modulators, and photonic materials/devices - a fundamental-light and nonlinear-photonics program (legacy LPQM at ENS Cachan). In the broader landscape of NV-centre ensemble quantum sensing (DEER, nano-NMR, T1 relaxometry) operating near pT/sqrt(Hz) sensitivity, this work connects via nonlinear-optical materials for photon-pair generation and modulation.