How do LASERs work? A Quantum Mechanical Explanation Using Perturbation Theory

In this video, I will use First order Time Dependent Perturbation Theory to explain stimulated emission and absorption, as well as spontaneous emission.

If you don't know where the initial formula came from, watch this video first:
https://youtu.be/S6JuFCrx4ds

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My name is Nick Heumann, I am a recently graduated physicist. I love to teach physics, so I decided to give YouTube a try. English is not my first language, but I hope that you can understand me well enough regardless.
▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
00:00 Recalling the Result from the Previous video
01:28 Writing down the Perturbation Hamiltonian for the Electromagnetic field
07:20 Finding the Transition Probability
10:00 Understand Stimulated Emission & Absorption
12:15 Understanding Spontaneous Emission
14:19 Check out my patreon!

Видео How do LASERs work? A Quantum Mechanical Explanation Using Perturbation Theory канала Nick Heumann University