Formation of an anti-guide structure and observation of enhanced SHG in photorefractive materials

Abstract In nonlinear-optical materials with photosensitivity and photoconductivity or in photorefractive materials, an anti-guide structure can be formed by light-pumping. Using a Maker-fringe setup, we observed enhancement of second-harmonic generation under irradiation of a pump light. The samples were sensitive to the pump He–Ne laser or Ar+ laser but not to the fundamental Q-switched Nd:YAG laser. SHG based on the anti-guide structure was studied under various conditions.