How lasers work - a thorough explanation
29:04
Podcast #2: Magdalena Kersting: engaging students to science through Einstein
21:33
How lasers work
8:26
What Happens if You Focus a 5W Laser With a Giant Magnifying Glass? Negative Kelvin Temperature!
24:37
Physicist Explains Lasers in 5 Levels of Difficulty | WIRED
12:05
The origin of Electromagnetic waves, and why they behave as they do
20:45
How Lasers Work - A Complete Guide
27:15
The Most Misunderstood Concept in Physics
58:14