Raicol Crystals


Wider Spectrum of laser applications

DFG (Difference Frequency Generation)

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Difference-frequency generation (DFG) is a non-linear optical process.

Generation of light with a frequency that is the difference between two other frequencies

This phenomenon is based on the annihilation of two input photons at angular frequencies \omega_1 and \omega_2 while, simultaneously, one photon at frequency \omega_3 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).

Difference-frequency generation is a “parametric process”, meaning that the photons satisfy energy conservation, leaving the matter unchanged:



Raicol Crystals provides the following types of crystals for DFG applications: