Almost everyone probably knows that the police use laser when they measure speed. At least many drivers that have exceeded the speed limit know about it, but how many know that you also use laser several times in a day? You will find its use in cd players and in laser printers. You often find laser in action movies where the hero has to escape the laser beams when he’s trying to solve a thrilling problem. The power contained in laser is both fascinating and frightening. There is nothing magical about a laser. It can be thought of as just another type of light source. It certainly has many unique properties that make it as a special source of light, but these properties can be understood without the knowledge of sophisticated mathematical techniques or complex ideas .The concepts, as they are developed, will be applied to all classes of laser frequencies and laser materials, so that we will develop a sense of broad field of lasers. Furthermore, we may also understand that how a laser light differs from ordinary light.

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