The receiver of green laser pointer

Its natural width of the zero generation of two laser light and matter the interaction of 1-ray spontaneous emission light of the spontaneous emission set E1 and E2 satisfy the radiative transition selection rules of photon energy incident photons: frequency stimulated absorption for a large number of particles: for a large number of particles: each independently spontaneous emission one a frequency photon-photon spontaneous emission of photons by stimulated emission of photons of each column light ν = {E2? E1 h of light phase relations are not fixed not fixed polarization direction of the phase relations can be different polarization directions can be different in different propagation direction of light propagation direction of the spontaneous emission can be different . spontaneous emission of light.The prices for green laser pointer with different volume are different. E1 on single photon spontaneous emission particles in the spontaneous emission time is accidental. for a single particle in the spontaneous emission time is accidental. a large number of particles, subject to statistical laws. a large number of particles, subject to statistical laws Statistical law of 151. spontaneous emission of light spontaneous emission light generated § 1-2 laser energy level of the particles change? high level of particle number change? Atomic energy level system: time to low levels of spontaneous transition particle number: spontaneous emission coefficient of the particle energy levels characteristic parameters of the system is a constant. Is a constant. Einstein spontaneous emission coefficient, Einstein spontaneous emission coefficient dN 21 A21 = N 2 dt physical meaning: in the level of each particle in the unit time probability of spontaneous emission. The receiver of green laser pointer looks like a USB drive.Physical meaning: each particle in the E2 level in the unit time probability of spontaneous emission. Magnitude is about -8 seconds, said, E2 level on the occurrence of spontaneous emission of each particle probability 1 / 2. 1 spontaneous emission of light spontaneous emission light generated § 1-2 of the excited state lifetime of the laser: high energy exponential decrease of the number of particles, reducing the speed determined by the A 21. Excited state lifetime average time t, dN21 atoms have stayed on in over 2 levels, the total time spent for the time, atoms have stayed on the E level before, the sum of all the atoms of life is the spontaneous emission transition probability of the countdown. Is the inverse of the spontaneous emission transition probability.The receiver of green laser pointer has no capacity even it looks like a USB drive. Is the number of excited particles decay when the initial particle number N times the time required. τ is the number of excited particles decay when the initial number of particles 20 to 1 / e times the time required. / Times the time required for 17 1. Spontaneous emission of light spontaneous emission light generated § 1-2 laser transition to the more low-level spontaneous situations: the spontaneous transition to the more low-level cases: if the atomic energy level E of the low level of m for a low level of spontaneous transition to spontaneous transition, if the atomic energy level n on a low level to a spontaneous transition, and also to the low level of D for transition probabilities of transition to other forms of non-radiative transition) of the other form of transition (for the transition probability for the transition to other forms of (non-radiative transition), the excited state En, the average life expectancy of the average life of excited state energy levels of atoms on the low level of m, respectively, to be where is the energy level En the atoms to a low level of probability for spontaneous emission transition.Let’s talk about something about the working theory of green laser pointer.