Figure 2-22. Coherence.
Figure 2-23. Laser coherence.
b. The Laser System. The basic concept in the laser system is that light
energy under pressure is stored in the laser; that energy is released in a huge, high-
powered burst of light which is a laser beam.
(1) Here is a good way to understand the laser system. Look at the
(a) Imagine a cardboard tube into which you have put small, round,
light-weight rocks. Put a thin piece of rubber on either end of the tube; hold the rubber
in place with rubber bands.