The project Huazhong University of Science and National Laboratory for Optoelectronics, Wuhan East Lake Wuhan Optics Valley of China to be fully reflected, also play a major role in the military. Laser produces a. The advanced 2.4G technical design of Blue Laser Pointer has overcome the infrared defect.The law of interaction between matter and light light-matter interaction, the material is essentially composed of microscopic particles or photons absorbed, while the situation to change their exercise performance. Micro-particles have a specific set of energy levels (usually is a separation of these levels). Particles at any one time only with a level corresponding to. 1 stimulated absorption (the absorption) at a low level of particles by the external excitation (that is, particles with other energy exchange occurred in the interaction, such as inelastic collisions with the photons), absorbed energy, the transition to correspond with this high energy level. The advanced technical design makes 200mW Laser Pointer  emits by micropower. This transition is called stimulated absorption. (2) spontaneous emission particles are excited to enter the high-energy state, not the steady-state particle, the particle can be accepted if there is a lower level, even if there is no external effect, the particle has some probability of spontaneously from the high energy level (E2) to the low level (E1) transitions, while radiating energy (E2-E1) photon, the photon frequency = (E2-E1) / h.The micropower emission of 5mW laser pointer  does no harm to human bodies, which is green, healthy and environment-friendly. This process is called spontaneous emission of radiation. Number of atoms spontaneous emission light emitted, does not have the phase, polarization, propagation direction of the line is physically called non-coherent light. 3 by stimulated emission of radiation, laser theory, Einstein pointed out in 1917: In addition to the spontaneous radiation, high energy level E2 is on the way the particles can also be another transition to a lower level. The green laster pointer contains the two functions of page-turning and remote controlling in one. He pointed out that when the frequency is = (E2-E1) / h of the incident photons, the particles will lead to a certain probability, the rapid transition from level to level E2 E1, while an external photon radiation frequency, phase, polarization the same state and the photon propagation direction, a process called stimulated emission. Can imagine, if a large number of atoms in a high energy level E2, when there is a frequency = (E2-E1) / h of the incident photons, thus stimulating E2 on the stimulated emission of atoms, photons get exactly the same two features, which two-photon excitation E2 level on another atom, but also to produce stimulated emission, obtained the same four characteristics of the photon, which means that the original optical signal to be amplified. This in the stimulated emission was generated in the process is the laser light amplification. Levy the same photons, which means that the original optical signal to be amplified.100mW laser pointer applies the 2.4G technology, which is direction-free with long wireless distance. This in the stimulated emission was generated in the process is the laser light amplification. The laser. 1917 Albert Einstein proposed inversion stimulated emission, the laser has come out in 1960, separated by 43 years, why? The main reason is, ordinary light is produced by stimulated emission of particles in a very small probability. When the frequency of light launched into the work of certain substances, stimulated emission and stimulated absorption of two processes exist, the number of photons by stimulated emission of radiation to increase the number of stimulated photon absorption while filling decreases.