Highly efficient third harmonic generation by means of four-wave difference-frequency mixing in fused silica

Abstract

We report on highly efficient third harmonic generation of 1-ps laser pulses in transparent isotropic solid state medium through phase-matched non-collinear four-wave difference-frequency mixing. Third harmonic pulses at 351 nm with 230 μJ energy and 15% energy conversion efficiency were generated in 3-mm-thick UV-grade fused silica sample by use of non-collinear phase matching, cylindrical beam focusing geometry, and pulse-front tilting.
Keywords: third harmonic generation, four-wave mixing
PACS: 42.65.Ky, 42.79.Nv