Optical phase conjugation of diffused light with infinite gain by using gated two-color photorefractive crystal LiNbO₃:Cu:Ce

Light focusing in multiple scattering circumstances is important in biomedical imaging, manipulation, and therapy. Until now, many traditional photorefractive crystals have been used to generate an optical phase conjugated wavefront in an analogue time-reversed optical focusing technology. However, owing to erasure of a volume hologram during a reading procedure, the optical energy gain can never reach unity, limiting its application in delivering more energy into a target area. In this work, we investigated a gated two-color photorefractive crystal LiNbO₃:Cu:Ce to generate optical phase conjugation of diffused light with infinite gain.