Three-wave parametric amplification

The unusual non-linear optical properties of polymer diacetylenes opened attractive prospects for their application in three or four-wave parametric amplifiers. Sauteret etal. reported that with a 1.06 pm, 1 GW/cm pump the gain for four-wave parametric amplification in the near infrared in PTS is about ten times larger than the gain for three-wave parametric amplification in LiNbOs. However, later work... 

Quadratic NLO effects arising from (3 and x(2) include SHG, the electro-optic (EO, Pockels) effect and frequency mixing (parametric amplification). SHG is actually just a special case of a three-wave... 

Non-linear optical interactions occur in materials with high optical intensities and have been used to produce coherent light over a wide range of frequencies from the far infra-red to the ultra-violet. The three wave mixing process is of particular interest as it can be used for optical parametric amplification and optical second harmonic generation (SHG) and occurs in non-centrosymmetric materials. 

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