High-efficiency pump-resonant quasi-phase-matched frequency doublers with flattop broadband responses

摘要

Considering the singly pump-resonance in a lossy lithium niobate waveguide with quasi-phase-matched apodized step-chirped domains as a broadband frequency doubler, the optimized values of back-facet reflectivity and input power have been calculated to obtain the maximum efficiency envelope of resonant modes while the bandwidth remains almost the same as the non-resonant waveguide.