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In order to change the output wave frequencies, one can change the pump frequency or the [[Nonlinear Optics|phasematching]] properties of the nonlinear optical crystal. This latter is accomplished by changing its temperature or orientation or quasi-phasematching period (see below). For fine-tuning one can also change the optical path length of the resonator. In addition, the resonator may contain elements to suppress mode-hops of the resonating wave. This often requires active control of some element of the OPO system.
If the nonlinear optical crystal cannot be phase-matched, [[quasi-phase-matching]] (QPM) can be employed. This is accomplished by periodically changing the nonlinear optical properties of the crystal, mostly by [[periodical poling]]. With a suitable range of periods, output wavelengths from 700 nm to 5000 nm can be generated in periodically poled [[lithium niobate]] (PPLN). Common pump sources are [[Nd-YAG laser|neodymium lasers]] at
An important feature of the OPO is the coherence and the spectral width of the generated radiation.
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