Physics:Optical downconverter
Optical DownConverter (ODC) is an example of a non-linear optical process, in which two beams of light of different frequencies [math]\displaystyle{ \omega_1 }[/math] and [math]\displaystyle{ \omega_2 }[/math] interact, creating microwave with frequency [math]\displaystyle{ \omega_3 = \omega_1 - \omega_2 }[/math]. It is a generalization of microwave. In the latter, [math]\displaystyle{ \omega_1 = \omega_2 }[/math], both of which can be provided by a single light source. From a quantum mechanical perspective, ODC can be seen as result of differencing two photons to produce a microwave. Since the energy of a photon is given by [math]\displaystyle{ E_\nu = \hbar\omega, }[/math]
the frequency summing [math]\displaystyle{ \omega_3 = \omega_1 - \omega_2 }[/math] 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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