samray
thank you Romos sam,,,,,,
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ROMOS
A laser diode is an electrically pumped semiconductor laser in which the active medium is formed by a p-n junction of a semiconductor diode similar to that found in a light-emitting diode. The laser diode is distinct from the optically pumped semiconductor laser, in which, while also semiconductor based, the medium is pumped by a light beam rather than electric current.
More here >http://en.wikipedia.org/wiki/Laser_diode
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