How Lasers Work

The three key characteristics of laser light - single wavelength, narrow beam, and high intensity - are made. The operation of a ruby laser - the first laser ever made - showing how electronic transitions create stimulated emission to give coherent light, and then how the ends of the ruby cavity create a narrow wavelength highly collimated beam.

Also if you want to learn about technology and how to repair it, follow the link>>>>>https://bit.ly/3u0iYKu