In absence of phase matching constraints (in a microscopic framework), are the quadratic SFG and DFG processes bonded together ? (Assuming you illuminate with two frequencies) is there an ultimate relative efficiency limit?
Dear Marco, it is difficult to understand, what you mean. Nonlinear polarization in the both processes is the same. The difference is that lower frequency omega 2-wave during SFG is depleted, but during DFG is amplified, so the answer on your question depends on which wave powers we compare. May be you ask about other things ?
Ok, is the local probability of two photons to undertake SFG and DFG in a quadratic system always the same (from the nonlinear coefficient expansion in the nonlinear quandratic hamonic oscillato)? My question mostly points to if a system in which significant SFG is taking place always requires significant simultanous ongoing DFG (off course I am not referring to the phase matching role in selecting a process)
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Waves