Harmonic generation

Harmonic generation occurs when a nonlinear medium interacts with an oscillating wave, like light or sound, to produce new waves at integer multiples of the original frequency. For example, shining a simple laser at a certain color can generate jets of light at higher frequencies, creating new colors. This process relies on the medium's properties, which distort the wave’s shape, causing these additional frequencies to emerge. Harmonic generation is widely used in scientific and technological applications, such as creating ultraviolet light from visible lasers or improving imaging techniques.