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An important feature of the OPO is the coherence and the spectral width of the generated radiation.
The two output waves are, to a very good approximation, [[Coherent state|coherent states]] (laser-like waves). The linewidth of the resonated wave is very narrow (as low as several kHz). The nonresonated generated wave also exhibits narrow linewidth if a pump wave of narrow linewidth is employed.
The output waves can be tuned in frequency by changing the path length of the optical resonator or by tuning the pump frequency.
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