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Introduction When an electron is stimulated to a higher energy level, it will subsequently produce a photon of light as the electron drops back to a lower energy level. This photon goes on to collide with another excited state electron ; this stimulate the emission of second photon and so on ( now there are two photons and thereafter three, four ... and so on) . Laser vs Light Lasers light is unique and is different from normal day light. It is this special characteristics of lasers light that enable lasers to produce Physiological Changes in cellular levels. Basically lasers are Monochromatic (one colour) whereas light are of 7 colours. Lasers are coherent whereas normal light are non-coherent ( due to many wavelengths) and lasers can be collimated. Technical Terms to Understand Lasers Lasers are measured in Wavelengths (Nanometers nm) and the power density or power output is measured in Watts (W). However the power output of most therapeutic lasers are in Mili-Watts (mW) or a thousands of a watts .
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