کوانتوم اپتیک و کوانتوم اپتومکانیک

Parametric amplification is a phenomenon where a signal can be amplified using a parametric nonlinearity and a pump wave. 

 It is different from laser amplification via stimulated emission by excited atoms, ions or molecules, or by excited carriers in a semiconductor laser;

It is also important to distinguish between degenerate and nondegenerate parametric amplification, because these lead to very different features.

Essentially, the amplification process implies that some of the pump photons are converted to signal and idler photons. More precisely, for each disappearing pump photon, one signal photon and one idler photon is generated.

https://www.rp-photonics.com/parametric_amplification.html