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The equivalent at a photon of light from the fluctuations of view has been the pattern, and from fluctuations in the photon point of view to get the model to be light, and from the photon point of view to get the light to be photon-photon quantum state model is the same, both in is equivalent to the concept of equivalent photons is the same quantum state, the two are conceptually equivalent. 1917 Einstein: Einstein 1917: The proposed on the basis of quantum theory: the quantum theory based on the: matter and radiation field in the interaction with, the atoms or molecules of matter in the light Inspired by the stimulated emission of photons generated by stimulated emission of light amplification by stimulated emission of light amplification by stimulated emission of laser by stimulated emission of light Zoom LASER 1960, 1960, ruby and theoretical solid-state lasers, as expected, the laser (stimulated emission) and ordinary light (spontaneous emission) are different.The china laser pointer could turn pages as the Page Up and Page Down keys do. With the theoretical expected, the laser (stimulated emission) and ordinary light (spontaneous emission) are different. Laser: color, direction, coherence, high brightness laser: color, direction, coherence, high brightness, short pulse of light by stimulated emission of radiation (Stimulated Emission) A light and matter ( atoms, molecules, ions, collectively referred to as particles) interaction of the three process E2 E1 E2 hν hν E1 E2 hν E1 2hν spontaneous emission (SP) (Spontaneous Emission) stimulated absorption (STA) stimulated emission (STE) (Stimulated absorption) (Stimulated Emission) E2 and E1 said the two excited states of a photon of energy h = E2? E1 ν the radiation frequency ν = E2? E1 h? spontaneous emission (Spontaneous Emission).With green laser pointer, you may finish the page-turning function in Word file. Main features: no external light, random light, emitted photons are not relevant, that is, phase, polarization, transmission direction is random; emitted photon energy distribution in many a model. E2 E1 hν E2 E1 hν spontaneous emission probability (Spontaneous transition rate) A21 - level 2 → 1 transition of the characteristic parameters of E2 level the average life expectancy derived A21 and τs of the relationship in the process of spontaneous emission, E2 level on the particles with time exponential decay? A21 and the spontaneous emission probability of spontaneous emission (level) showed a reciprocal relationship τs life? τs can be measured experimentally by A21 = 1/τs obtain the spontaneous emission probability? You may turn pages as you like by china laser pointer in the Excel file. A21 depends only on the nature of the material itself, and radiation field ρν nothing? stimulated transition stimulated absorption stimulated absorption (STA) by stimulated emission stimulated emission (STE) by the frequency ν = E2? E1 of the light field function h E2 hν E1 stimulated emission of photons with the same phase, direction of polarization and transmission probability of stimulated absorption probability of stimulated emission monochromatic W12 energy density (J ? m-3 ? s) 8πν ρν = 3 c 2 e hν KT hν? 1 B and B21 for the stimulated absorption and stimulated emission transition coefficient, constant 12 B12 and B21 only with the size of the nature of the material itself, has nothing to do with the external radiation field and the probability of stimulated emission of radiation field intensity ν ρ is proportional to the level 2 → 1 and 1 → 2 of stimulated transition probability equal to that is, W = W21 12 stimulated transition and spontaneous transition is fundamentally different physical processes A = 0 12 A21, B21 and B12 relationship (Einstein relation) derived two.You may turn pages by operating china laser pointer when you are browsing web pages.