Abstract

A multi-layer waveguide that enhances counterpropagating surface normal second-harmonic generation (SNSHG) has been reported.^1,2 The design consists of alternating λ^2ω/2 layers of materials with high and low χ⁽²⁾ which we refer to as the generating and spacing layers, respectively. We have modeled the loss mechanisms in such structures and find that insufficiently mismatched second-harmonic coefficients can give greater loss than second-harmonic absorption in semiconductor layers.

© 1992 Optical Society of America