Register to reply

Laser diode principals

by Goodver
Tags: diode, laser, principals
Share this thread:
Goodver
#1
May1-14, 08:59 AM
P: 47
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?
Phys.Org News Partner Physics news on Phys.org
Technique simplifies the creation of high-tech crystals
Working group explores the 'frustration' of spin glasses
New analysis of oxide glass structures could guide the forecasting of melt formation in planetary interiors
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: 1,627
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.


Register to reply

Related Discussions
TE / TM polarization of a Laser Diode General Physics 2
Would it be possible to produce a dif laser by 382nm UV diode laser with a 910nm IR Classical Physics 3
Fastest modulation: laser diode vs LED... Electrical Engineering 1
Eye Safe Laser Diode Electrical Engineering 4
Modulating a diode laser with sound Electrical Engineering 1