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Laser welding machine working five necessary conditions for


1. stimulated emission: the first condition is necessary but not sufficient condition.
2. the material must have a metastable energy levels
If the laser launch out children, could not form a powerful energy. (Spontaneous emission), electrons are excited into high energy level, a stay is short in the high energy level. And some of the material the electrons in the second energy level for a longer time, second only to the ground state energy. This level is called a metastable energy level.
3. the population inversion
External photon excitation photons, produce stimulated emission, but may also be absorbed by the lower energy. In a laser medium, stimulated emission and stimulated absorption of both processes simultaneously. At room temperature, absorbing more than launch. Select the appropriate material, make it higher (sub-) level on the more electronic than electronic low energy level, which form a population inversion, the stimulated emission than absorption.
4. the resonator
Began to produce is spontaneous emission of photons in the laser, the frequency and direction of clutter. To make the frequency of simple, focused, and must have a resonator
5. gain than loss
Photons of laser material and resonant cavity losses. Only the photon number of photons in the cavity oscillation in a much more photons than lose much amplification.
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