<P> The most important part of an optical disc drive is an optical path , placed in a pickup head ( PUH ) , usually consisting of a semiconductor laser , a lens for focusing the laser beam , and photodiodes for detecting the light reflected from the disc 's surface . </P>
<P> The most important part of an optical disc drive is an optical path , placed in a pickup head ( PUH ) , usually consisting of a semiconductor laser , a lens for focusing the laser beam , and photodiodes for detecting the light reflected from the disc 's surface . </P>
what type of laser is used in cd and dvd players
what type of laser is used in cd and dvd players
semiconductor
semiconductor