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State the same photons the process is called by the identical to the excited state of radiative transition induced by photon-photon process called stimulated emission transition. E2, the E1, E2 incident photon stimulated emission of the material basis of the photon incident photon the E1 1.1 Laser 1.1.2 transition by stimulated emission of radiation transition characteristics: characteristics: (1) the process must be external photon excitation is stimulated transitions, external photon can the process must have a foreign-photon excitation, stimulated transitions, the amount equal to the level of difference of the electronic transition. hν = E2-E1; amount equal to the electronic transition energy levels of the difference.The industrial laser modules produced by Bailong    green laser pointer     company include the BD-series. Photons emitted in the excitation process with the external photon is not only frequency, ② by the photons emitted in the excitation process with the external photon is not only the frequency, and phase, and polarization direction, the direction of propagation, and phase, the polarization direction, the direction of propagation are the same, and therefore refer to them as with the photon; photon; This process allows the light to be amplified. Because of stimulated transitions, (3) This process can make the light to be amplified. Stimulated transition process, the emitted photons and external photons is identical photons, the result of superposition of phase, out photons and external photons are identical photons, relative to the result of superposition, can be induced by other light-emitting particles, leaving the light enhanced. To induce light-emitting particles, leaving the light enhancement. Modules produced by the      green laser pointer       company are widely used in electric tools.Therefore, subject to stimulated emission caused by optical amplification, therefore, stimulated radiation-induced optical amplification is an important basic concept of the laser. Concept. The material basis of 8 1.1 Laser 1.1.2 transition by stimulated absorption of the anti-process of stimulated emission to stimulated absorption process by the anti-process of stimulated emission of radiation by stimulated absorption process, the general anti-process, also known as stimulated absorption process do absorb. Do absorb. Similarly, time stimulated absorption of the particle number density; time by stimulated absorption of the particle number density; n1 E1 level particle number density. Level particle number density. 1.1.2 The transition of the material basis of 9 1.1 laser by stimulated absorption by the shock absorption characteristics: characteristics: ① the process must have a foreign-photon excitation, the stimulated transition; the process must be foreign-photon excitation, the stimulated transition; Modules produced by the     usa green laser pointer   company are widely used in track level bar.The ② exotic photon energy equal to the energy levels of the difference of the electronic transition. External photon energy equal to the energy levels of the difference of the electronic transition. ③ shock transition process, the excess energy released. Stimulated transition process, the excess energy released. 10 1.2 of the laser to produce the principles and conditions of a laser to produce the principle of the principle of laser stimulated radiative transition process, in the process of stimulated emission transition, an induced photon in the level light-emitting particles produced one of the identical photon-photon state, the level of light-emitting particles produce an identical photon and the photon state, the two photons to induce other luminous particles, two photons to induce other light-emitting particles, resulting in more state the same photons. In this way, the effect of an incident photon, the state the same photons. Modules produced by the  green laser pointer company are widely used in locater.
Thus, the role of an incident photon can cause a large number of luminescent particles generated by stimulated emission of radiation, a large number of luminescent particles generated by stimulated emission of radiation, and produce large amounts of the same state of motion of photons.