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An important feature of the OPO is the coherence and the spectral width of the generated radiation.
When the pump power is significantly above threshold, the two output waves are, to a very good approximation, [[coherent state]]s (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. Narrow-linewidth OPOs are widely used in spectroscopy.<ref>[[F. J. Duarte]] (Ed.), ''Tunable Laser Applications'', 2nd Ed. (CRC, New York, 2009) Chapter 2.
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== Quantum properties of the generated light beams ==
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