An optical parametric oscillator (OPO) is a non-linear optical device that generates coherent light by utilizing a nonlinear medium to convert a pump beam into two lower-energy photons, referred to as signal and idler beams. This process of parametric down-conversion enables the production of tunable laser light across a wide range of wavelengths. OPOs play a crucial role in enhancing sensitivity in various applications, particularly in the detection of gravitational waves.
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