What is Laser?

The term laser should not sound alien to you. We often encounter laser in our daily life, examples include the laser pointer used in classrooms, and the CD-ROMs in a computer or in a hi-fi that are used to read the data stored in a CD. In industry, laser is often used for cutting and microscopic processing. For military purposes, laser is used to intercept guided missiles. Scientists have also accurately measured the distance between the Earth and the Moon by using laser; the error involved is only a few centimeters. These are some extensive applications of laser. So actually how is it produced? We will explain the basic principles of laser below. For more details click here.

Credit: http://www.hk-phy.org