Optical downconverter

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Optical DownConverter (ODC) is an example of a non-linear optical process, in which two beams of light of different frequencies \omega _{1} and \omega _{2} interact, creating microwave with frequency \omega _{3}=\omega _{1}-\omega _{2}. It is a generalization of microwave. In the latter, \omega _{1}=\omega _{2}, both of which can be provided by a single light source. From a quantum mechanical perspective, ODC can be seen as result of deferencing two photons to produce a microwave. Since the energy of a photon is given by

E_{\nu }=\hbar \omega ,

the frequency summing \omega _{3}=\omega _{1}-\omega _{2} is simply a statement that energy is conserved.

In a common ODC application, light from a tunable infrared laser is combined with light from a fixed frequency visible laser to produce a microwave created by a wave mixing process.

The ODC use milimeteric microwave cavity that include photonic crystal that provide by two signal frequency light source. The microwave is detected by the cavity antenna.

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