How a Laser Works
33:45
Why It Was Almost Impossible to Make the Blue LED
21:33
How lasers work
13:55
How lasers work - a thorough explanation
12:05
How Lasers Work, with Neil deGrasse Tyson
13:23
Testing Illegal Blue Lasers from eBay (and making them even stronger)
8:40
Shining The World's Most Powerful Laser At The Moon!
16:44
We Built A Laser Out Of Tin Foil And Highlighters
58:14