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We report on highly efcient 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 "J energy and 15% energy conversion efcienc y 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.

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