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I have a semiconductor diode that has spontaneous emission (LED).

The question is what can I change in the fabrication of the diode to improve its performance such that the diode gains a stimulated emission like a laser.

I asked my professor for help and he told me to make the procedure in 4 steps. I do not know if there is a standard way of doing this conversion from spontaneous to stimulated emission.

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Well the conversion of spontaneous to stimulated emission is a part of the lasing process. My recommendation is that you you take look at the a book on lasers, my personal recommendation is : "Introduction to Laser Technology, Fourth edition. C. Breck Hitz, J. Ewing, and J. Hecht", its super easy to read and it teaches you the fundamentals.

Here's an illustration from that book that might be a good explainer: Cascading the spontaneous emissions to make it stimulated

In each of the rods, you basically have a lasing effect as shown down here: enter image description here

In some cases you use the same principle and skip having a cascade by adding a resonator: enter image description here

References - All illustrations are from the book "Introduction to Laser Technology, Fourth edition. C. Breck Hitz, J. Ewing, and J. Hecht"

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  • \$\begingroup\$ Hmm it wouldn't hurt to add something about what is in the jar and how it is stimulated, like what makes something qualify as a stimulable material. I assume "stimulated" means energy is added to the material somehow that causes it to emit the extra photons seen from identical jars in the diagram. \$\endgroup\$
    – K H
    Commented Mar 16, 2021 at 3:05
  • \$\begingroup\$ Go here in a youtube video by Dan Gelbart. I've set the time correctly in that link to start you just where you need to be on lasers. Listen to the discussion and realize that many folks did not understand how this all works in theory, at first. The details are non-trivial, in practice. That said, the implementation isn't that difficult once you've worked out the fact that certain circumstances can be made to work. \$\endgroup\$
    – jonk
    Commented Mar 16, 2021 at 8:28
  • \$\begingroup\$ Yeah, I didn't go into what happens in the jar because I'd have to talk about things like population inversion and emission lines and bandgaps. The resource I pointed would do a better job than me in explaining in a stackexchange post. \$\endgroup\$
    – rkrishnasanka
    Commented Mar 16, 2021 at 13:14
  • \$\begingroup\$ I just found a related post: electronics.stackexchange.com/questions/280542/… \$\endgroup\$
    – rkrishnasanka
    Commented Mar 16, 2021 at 13:16

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