 Parametric process (optics)

In optics, a parametric process refers to a nonlinear optical phenomenon in which the properties of a light beam are modified by interaction with a nonlinear medium. This interaction often involves the generation of new frequencies of light, typically through processes such as parametric amplification or parametric down-conversion. ### Key Concepts: 1. **Nonlinear Medium**: A material in which the response to an electric field (or light) is not linear.