= Three-level laser
The type of laser described at: <video How Lasers Work by Scientized (2017)>, notably https://youtu.be/_JOchLyNO_w?t=581[]. Mentioned at: https://youtu.be/_JOchLyNO_w?t=759[] That point also mentions that 4-level lasers also exist and are more efficient. TODO dominance? Alternatives?
\Video[https://www.youtube.com/watch?v=6c89tsJHuWc]
{title=<Three-level laser> system by Dr. Nissar Ahmad (2021)}
Bibliography:
* https://www.britannica.com/technology/three-level-laser
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