Interaction of photons in a non-linear medium satisfying the energy and
momentum
conservation laws. During the interaction the photon frequencies are mixed and photon(s)
with different frequencies are created.
Note:
Optical parametric processes of three interacting beams, called frequency
mixing processes, are: second-harmonic generation (SHG),
sum-frequency generation (SFG), difference-frequency generation (DFG),
optical parametric generation and amplification (OPG and OPA), and optical parametric oscillation (OPO).
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 381
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.
