Picosecond degenerate four-wave mixing in soluble polydiacetylenes

Abstract
The observation of optical phase conjugation utilizing the intrinsic Kerr‐like nonlinear susceptibilities of two soluble polydiacetylenes is reported. Phase conjugate reflectivities of up to 40% were observed on a timescale of ≲100 ps and a value of χ(3)xyyx =7×1012 esu evaluated.