Second-harmonic generation

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Science and technology

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What Wikipedia says

Second-harmonic generation (SHG), also known as frequency doubling, is the lowest-order wave-wave nonlinear interaction that occurs in various systems, including optical, radio, atmospheric, and magnetohydrodynamic systems.

Excerpt from the Wikipedia article “Second-harmonic generation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: BP-Aegirsson, CC BY-SA 4.0, via Wikimedia Commons.