How Did We Find Out About - Isaac Asimov - Laser
What is this marvellous ray that can read supermarket prices or mend a damaged eyeball? How can the same kind of light ray bore through steel and print a delicate picture? It took Max Plank's quantam theory, Einstein's creative thinking, and Charles Towne's experiments in the 1950's to put us on the track of making such a powerful beam of light. Light, which usually spreads out in all directions, needed to be forced into focus. Then one kind of wave length needed to be stimulated to be strong and straight. The device that was created to accomplish this work in the laser. How it all happened is a real adventure story. The men who made it happen found out a great deal about light on the way to the laser. Here you'll discover that laser really stands for Light Amplification by Stimulated Emission of Radiation, and learn about the many wonderful things it can do. And more waiting to be discovered. 1. Waves THE LIGHT WE see consists of a stream of tiny waves. It takes ab...