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<p>rather than many many times).</p>

<p><big>Optical parametric generation (OPG)</big></p>
<p>Optical parametric generation (OPG) (also called "optical parametric fluorescence", or "<a href="page.php?w=spontaneous_parametric_down_conversion">spontaneous parametric down conversion</a>") often precedes optical parametric amplification.</p>

<p>In <a href="page.php?w=optical_parametric_generation">optical parametric generation</a>, the input is one light beam of frequency ?<sub>p</sub>, and the output is two light beams of lower frequencies ?<sub>s</sub> and</p><p>
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