LASER Carrier Rate Equation

/ edmundsj
If you want to see more of these videos, or would like to say thanks for this one, the best way you can do that is by becoming a patron - see the link above :). And a huge thank you to all my existing patrons - you make these videos possible.
In this video, we figure out the rate equation for carriers in the active region of a laser in terms of the total recombination and the injection efficiency. In steady-state, this equation reduces to one that implies that the photons we get out, in the best case, is proportional to the current.
This is part of my graduate series on optoelectronics / photonics, and is based primarily on Coldren's book on Lasers as well as graduate-level coursework I have taken in the EECS department at UC Berkeley.
Hope you found this video helpful, please post in the comments below anything I can do to improve future videos, or suggestions you have for future videos.

[@Edwinator18]

OH MY GOD! You are the Sal Khan of photonics. Keep up the spectacular work.

[@Ashxxik-EC001]

Thanks!

[@prayanshusingh1778]

👍

[@eranfalek]

If I assume the injected current is DC, the the current going into the semiconductor equals the current going out. If some are recombine then this is not the case? In order for them to accumulate the currents shouldnt be equal. Where am I wrong?