Optical Parametric Oscillation
6.1 Optical Parametric Oscillation
An Optical Parametric Oscillator (OPO) is a device in which one or more of the nonlinearly interacting light beams in an optical parametric generation (OPG) process are resonated, usually by placing the nonlinear medium between mirrors with high reflectivity coatings for the resonated wavelength or wavelengths. This process, called Optical Parametric Oscillation (and also designated OPO) was first demonstrated in 1965 by Giordmaine & Miller  and it is an important method for generating fixed frequency or tunable coherent radiation in parts of the spectrum where directly generated laser beams are not available.
An OPO is called a Singly Resonant Oscillator (SRO), ...
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