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<p>as a <a href="page.php?w=Fabry-P%C3%A9rot_interferometer">Fabry-Pérot interferometer</a>. Unlike previously considered designs, this approach would produce a narrow, <a href="page.php?w=coherence_%28physics%29">coherent</a>, intense beam. Since the sides of the cavity did not need to be reflective, the <a href="page.php?w=Active_laser_medium">gain medium</a> could easily be optically pumped to achieve the necessary <a href="page.php?w=population_inversion">population inversion</a>. Gould also considered <a href="page.php?w=Laser_pumping">pumping</a></p><p>
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