OPO (optical parametric oscillator)
OPO converts an input laser wave (called “pump”) with frequency 
into two output waves of lower frequency (
) by means of second order nonlinear optical interaction.
The sum of the output waves’ frequencies is equal to the input wave frequency: 
.
The two output waves are called “signal” and “idler”.
Raicol offers the following types of crystals for OPO applications:
