In non-linear optics, what is the basic requirement to have non-linear optical p

Question

In non-linear optics, what is the basic requirement to have non-linear optical processes occur? Explain the difference between linear and non-linear optics. When does an optical material become non-linear? Given an example! How does the level of irradiance affect the process and make the dielectric response non-linear? Is the superposition principle applicable to non-linear optics? what is phase matching? why is it important in non-linear optics. Explain second order effects such as frequency doubling. explain third order effects that are generally known as four wave mixing

Explanation / Answer

Nonlinear optical behavior is not observed when light travels in free space. The

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