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It is basic knowledge that RAMAN is not Parametric process!!!!!!!! It seems the optical science education of our country need to be improved much !!!! As the first guy said it is true that OPG and DFG happend together and it is also true that there is a crital length for OPG, which would help make the transform effeciency largest. While if you solve some simple Schrodiger Equation of Two states, the initial state determined the efficiency of Raman Process, which is not true for Parametric process. Further, OPO has osscilator. That's the reason of OPO different from OPA. |