Coher ent ant i-St okes Raman scat t er ing (CARS) is a nonlinear opt ical pr ocess r elat ed t o Raman scat t er ing
CARS is a power f ul imaging t echnique f or biological samples t hat pr ovides high r esolut ion and chemical
selectivity.
To cr eate CARS signal, t wo specially t uned laser beams ar e used t o cr eat e a t hir d beat f r equency.
When the beat frequency is tuned t o match the Raman vibrational frequency of a molecule, a st r ong
signal is produced.