= Frequency addition source of optical radiation
{wiki=Frequency_addition_source_of_optical_radiation}
Frequency addition in the context of optical radiation typically refers to a nonlinear optical process in which two or more light waves of different frequencies combine to generate new light at a frequency that is the sum of the original frequencies. This process can occur in certain nonlinear materials and is a key concept in the field of nonlinear optics. One common instance of frequency addition is **sum-frequency generation (SFG)**.
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