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:
- Also known as a parametric downconversion.
- 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.