Surface phase-matched harmonic enhancement in a bulk anomalous dispersion medium

摘要

Scattering second harmonic ring could be observed in a bulk nonlinear medium with anomalous dispersion, whose generation is derived from complete phase matching of the incident light and the scattering light. By this specific phase matching under anomalous dispersion condition, we took advantage of total internal reflection, and realized high efficiency second harmonic output to gain a single pass conversion efficiency of up to 14.8% by only once reflection. It may suggest potential applications in micro-structures, such as micro cavities and waveguides.