laser technology is of the most rapidly developing areas in modern technology.When the laser was invented ,in 1960,it was classified as a solution in search of a problem ,and today laser technology is applied in many different areas such as :medicine,communication,daily use,military,and industry .To explain how the laser can be applied in such diverse areas, we need to understand the basic physical principles of the operathion of a laser
In principle, the laser is a device which transforms energy from other forms into electromagnetic radiation this is a very general definition , but it helps to understand the basic physics of the laser . the energy put into the laser can be in any form such as electromagnetic radiation, electrical energy, chemical energy , etc . Energy is always emitted from the laser as electromagnetic radiation (which includes light beams).
From this light output , the laser got part of its name :LASER= Light Amplification by Stimulated Emission of Radiation . As we see, the word laser started as acronym but it is now accepted as a word , with other words derived from it : "to lase " ,"lasing" etc . We will try to obtain a qualitative picture of quantum nature of laser , based on some basic principles which came from the advanced mathematical tools . Before studying about lasers , you must be familiar with basic terms use to describe electromagnetic waves :
Wavelength ,Frequency , Period , Velocity of light and Index of refraction
0 التعليقات:
إرسال تعليق