Frequency-doubling

Frequency-doubling is a phenomenon where a wave's frequency, or how many cycles it completes in a second, becomes twice as high as its original value. Imagine a wave oscillating at a certain speed; after frequency-doubling, it vibrates twice as fast, resulting in a wave with twice the number of peaks and troughs per second. This process often occurs in nonlinear optical materials when intense light interacts with them, converting laser light from one color (frequency) to another with double the energy and shorter wavelength, useful in various laser and imaging technologies.