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Sum-frequency generation (SFG) is a non-linear optical process.
This phenomenon is based on the annihilation of two input photons at angular frequencies and while, simultaneously, one photon at frequency is generated. As with any phenomenon in nonlinear optics, this can only occur under conditions where:
- The light is interacting with matter;
- The light has a very high intensity (typically from a pulsed laser).
Sum-frequency generation is a “parametric process”, meaning that the photons satisfy energy conservation, leaving the matter unchanged:
A special case of sum-frequency generation is second-harmonic generation
Raicol Crystals provides the following types of crystals for SFG applications: