Why named it parametric amplifier?

[Hossein Roshan]

Hello
I have a seminar for my Optic Course in university with this title : Optical Parametric Amplifiers.

I searched a lot but I couldn't find why its name "Parametric Amp" I think its about RF parametric amp..

Please if you know why named "parametric" share your knowledge with me.

Thanks for advance

 

[anorlunda]

I googled "define parametric amplifier" and got this.

Definition of parametric amplifier. : a high-frequency amplifier whose operation is based on time variations in a parameter (such as reactance) and which converts the energy at the frequency of an alternating current into energy at the input signal frequency in such a way as to amplify the signal.

Didn't you do that before posting your question?

 

[Baluncore]

Some materials have a non-liner parameter that can, when pumped by an oscillator, be used to amplify an input signal.
https://en.wikipedia.org/wiki/Optical_amplifier#Optical_parametric_amplifier