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Laser diode principals

by Goodver
Tags: diode, laser, principals
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Goodver
#1
May1-14, 08:59 AM
P: 52
As far as I understand, when forward biased voltage applied, electrons from N diffuse to P, then recombine. Since energy gap between conductive electron and hole is const => only certain wavelength photons is emitted.

In gaseous lasers for example you need to gain a populational inversion, which requires to have a certain energy levels, including one of them to be metastable.

How the stimulated emission works for laser diodes?
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UltrafastPED
#2
May1-14, 01:08 PM
Sci Advisor
Thanks
PF Gold
UltrafastPED's Avatar
P: 1,908
Here is a lecture/outline on that topic:

http://ocw.mit.edu/courses/electrica.../lecture20.pdf
Cthugha
#3
May1-14, 01:44 PM
Sci Advisor
P: 1,647
By the way, the formal name for the semiconductor equivalent of population inversion which is discussed in the PDF linked by UltrafastPED is the Bernard-Duraffourg condition. If you need more details, that is the term to look for.


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