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<p><a href="page.php?w=crystal_growth">crystal growth</a> techniques, usually starting from an N-<a href="page.php?w=semiconductor_doping">doped</a> substrate, and growing the I (undoped) active layer, followed by the P-doped <a href="page.php?w=cladding_%28fiber_optics%29">cladding</a>, and a contact layer. The active layer most often consists of <a href="page.php?w=quantum_well">quantum well</a>s, which provide lower threshold current and higher efficiency.</p>

<p><big> Electrical and optical pumping </big></p>
<p>Laser diodes form a subset of the larger</p><p>
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