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26.8 Light emitting diodes; semiconductor lasers

For more details on LEDs see the Wikipedia entry  (Wikipedia).

 

Click this link for a simple explanastion of .

from Chris Woodford article in explainthatstuff.com/

In this one minute  the inventor of the semiconductor laser, Robert N. Hall who developed this type of laser in 1962, explains the basic principles involved.  

Understanding Physics

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Mansfield and O'Sullivan, Understanding Physics, 3rd ed., John Wiley & Sons, Chichester (2020),

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