The process by which two photons with frequencies
and
combine in a non-linear medium to produce a higher energy photon with frequency
such that
Notes:
- Also known as a parametric upconversion or sum frequency generation.
Upconversion is the reverse process of downconversion.
- The efficiency of the conversion process depends on the parametric gain
in the non-linear material. This in turn depends on the power 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 437
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
