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Laser Light Control Technology Oct 24, 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. Laser Light

The stimulated light produced by the excited shot transition has the same frequency, phase, direction of propagation and polarization direction as the incident 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.Laser Light

If a piece of activating material is placed in an optical resonator composed of two parallel mirrors (at least one of which is partially transmitted), the high-energy particles produce spontaneous emission in various directions. Among them, the non axial propagation of the light wave quickly out of the resonant cavity: the axial propagation of light waves can be transmitted in the cavity, when it spreads in the laser material, the intensity of light is growing. If the one-way small signal gain g0l in the resonant cavity is greater than the single loss δ (g0l is the small signal gain coefficient), the self-excited oscillation can be generated. The motion state of atoms can be divided into different energy levels, and when atoms jump from high-energy to low-energy, they emit photons of corresponding energies (so-called spontaneous radiation).Laser Light

Before the laser invention, the high voltage pulsed xenon lamp in artificial light source is the highest brightness, and the brightness of the sun is comparable, and the laser brightness of ruby laser can surpass xenon lamp tens of billions of times times. Because the laser has a very high brightness, it can illuminate distant objects. The light emitted by the ruby laser beams on the moon is about 0.02 lux (illumination units), with bright red colors and visible laser spots. If you use the most powerful searchlight to illuminate the moon, the illumination is only about One-zero lux, the human eye can not be detected. The main reason for the high brightness of laser is directional luminescence. A large number of photons are concentrated in a very small space range, and the energy density is very high.Laser Light