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Reference.org
Solid-state laser
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<p>A solid-state laser is a <a href="/facts/Laser/jk6PTvvT">laser</a> that uses a <a href="/facts/Active_laser_medium/Gmcharyh">gain medium</a> that is a <a href="/facts/Solid/hj5UsXno">solid</a>, rather than a <a href="/facts/Liquid/t9GkLWzt">liquid</a> as in <a href="/facts/Dye_laser/IRw09pbC">dye lasers</a> or a <a href="/facts/Gas/hVVAoodV">gas</a> as in <a href="/facts/Gas_laser/1eIYl75j">gas lasers</a>. <a href="/facts/Semiconductor/zFf3mGTE">Semiconductor</a>-based lasers are also in the solid state, but are generally considered as a separate class from solid-state lasers, called <a href="/facts/Laser_diode/TjHzJteV">laser diodes</a>. </p>