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<p><b>Gain-switching</b> is a technique in <a href="page.php?w=optics">optics</a> by which a <a href="page.php?w=laser">laser</a> can be made to produce pulses of <a href="page.php?w=light">light</a> of extremely short duration, of the order of picoseconds (<a href="page.php?w=1_E-12_s">10<sup>-12</sup>&nbsp;s</a>).</p>

<p><div style="float:right;width:424px;margin:0 0 1em 1em"><a href="page.php?w=Image%3Againswitchpulse.png">Pulse generated by gain switching</a></div></p>

<p>In a <a href="page.php?w=semiconductor_laser">semiconductor laser</a>,</p><p>
<a accesskey="3" href="page.php?w=gain-switching&amp;p=2">3.Next</a>
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