Theuse of diversified types of data using is very important in our life, so weshould understand that the original many time we are not really clear aboutthese diverse material characteristics, more important is to face thesediversified use of the information, we must not the most strange is the laser,the laser the physical plant changed our life to a great extent, but in ouropinion this is the material of laser protective glasses has brought us a lotof damage!
Laseris a principle of the use of optics, but how to be able to become a generallaser light from the laser protective glasses to inform you that you have tounderstand the principle of atomic luminescence. An atom from the high-
energyreduction at low energy band, will emit a photon, called spontaneous emission.Atomic by a photon impinging on the high level, will be stimulated and releaseanother photon of the same, become two photons, called stimulated emission. Ifthe stimulated emission process continues to occur, a photon is made will bemore and more. As long as we put the atomic number control with high level inthe number of atoms is higher than that of low order, then the stimulatedemission process will continue to occur, the manipulation of atom stimulatedlight equipment we called it "optical amplifier".
Inthe days of the original laser is ignored but very important, we bear the bruntof the doubt is harm when we use laser material type can not be ignored whenthe laser material has given us. Laser is the most important and most common inour day, we can not face a single laser.
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