## downconversion

https://doi.org/10.1351/goldbook.DT07362
Process by which a @P04627@ with @F02525@ $$\nu _{1}$$ interacts with a non-linear medium and splits into two simultaneously emitted photons with frequencies $$\nu _{2}$$ and $$\nu _{3}$$ so that the energy is conserved: $\nu _{1}=\nu _{2}+\nu _{3}$
Notes:
1. Also known as a parametric downconversion.
2. The efficiency of the conversion process depends on the parametric gain in the non-linear material. This in turn depends on the @P04792@ of the incident radiation, the photon frequencies, their indices of refraction in the material, and the non-linear 'hyper-susceptibility' of the material.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 326 [Terms] [Paper]