Considering Photoinduced Second-Harmonic Generation as a dc Kerr Optical parametric Oscillation or Amplification Process

Phys. Rev. Appl. 16, 014027 (2021)https://ireap.umd.edu/10.1103/PhysRevApplied.16.0140272021Journal ArticleAdvanced Materials and Nanotechnology

Photoinduced second-harmonic generation (SHG) in centrosymmetric materials like silica and silicon nitride has been commonly explained as an effective second-order process mediated by a dc electric field and the medium’s third-order  nonlinearity.