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In order to change the output wave frequencies, the [[Nonlinear_Optics|phasematching]] properties of the crystal must be changed. This is accomplished by changing its temperature or orientation or quasi-phasematching period (see below). In addition, the resonator may contain elements to suppress mode-hops of the resonating wave and to change the optical path length of the resonator. Mode-hop suppression often requires active control of some element of the OPO system.
As nonlinear optical crystals, crystals using [[quasi-phasematching]] (QPM) can be employed. With a suitable range of these, output wavelengths from 700 nm to 5000 nm can be generated. Common pump sources are [[YAG_laser | Neodymium lasers]] at 1 <math>\mu</math>m or 0.5 <math>\mu</math>m.
An important feature of the OPO is the coherence and the spectral width of the generated radiation.
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