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Analysis OfLaser Light Stimulated Rate Nov 02, 2017

If the atoms or molecules such as microscopic particles have high-energy E2 and low energy level E1, the density of the E2 and E1 levels is N2 and N1, there are three kinds of processes, such as spontaneous emission transitions, stimulated transition and stimulated absorption transitions between two levels. The stimulated light produced by the excited shot transition has the same frequency, phase, direction of propagation and polarization direction as the incident light.Laser Light

Therefore, the excitation light generated by a large number of particles in the same coherent radiation field is coherent. The probability of excited shot transition and the probability of stimulated absorption jump are all proportional to the monochromatic energy density of the incident radiation field. When the statistical weights of two levels are equal, the probabilities of the two processes are equal. In the case of thermal equilibrium n2<n1, the spontaneous absorption transition is predominant and the light passes through the material and is usually attenuated by stimulated absorption.Laser Light 

The excitation of the outside energy can destroy the heat balance and make the n2>n1, which is called the particle number inversion state.Laser Light

In this case, the stimulated jump is predominant. The light intensity increases EGL times after a laser working substance (activating substance) that is in the reverse state of a particle number that is long L. G is proportional to (n2-n1) coefficients, called gain coefficients, and their size is also related to the nature of the laser working substance and the frequency of light waves. A piece of activating substance is a laser amplifier.Laser Light

Ordinary light sources are glowing in all directions. To allow the light to spread in one direction, the light source must be fitted with a certain concentrator, such as the car headlights and searchlights are installed with a concentrated reflector, so that the radiant light together in one direction. Lasers emitted by laser are inherently emitted in one direction, with a minimum divergence of about 0.001 radians and nearly parallel.Laser Light