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OPO Coatings
What is an optical parametric oscillator?
Chances are that if you are interested in OPO coatings you already know what they are, but just in case...
An optical parametric oscillator (OPO) is a device, which converts laser radiation – the so-called pump wave - efficiently into two coherent light waves with longer wavelengths, called signal and idler wave. The signal and idler wavelengths are tunable and can cover broad wavelength ranges. This wavelength tunability and the high output power make the OPO an ideal light source for an enormous number of applications, including light detection and ranging (LIDAR), high-resolution spectroscopy, medical research, environmental monitoring, display technology, and precision frequency metrology.
A schematic setup of an optical parametric oscillator (OPO) is shown at the header of this page. The powerful radiation from a pump laser is sent through a special, optically nonlinear crystal (such as PPLN, KTP, LBO, KTA and BBO to name a few). The generated signal wave is resonantly enhanced by the OPO cavity formed by the mirrors M. At high pump intensities, a considerable part of the pump laser radiation can be converted into signal and idler radiation.