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green laser pointer suitable to the condition of our country. The original Chinese name of laser called "Laser", "les" is its English transliteration of the name LASER is taken from the English Light Amplification by Stimulated Emission of Radiation the first letter of each word consisting of abbreviations. Means "to expand by stimulated emission of light." Laser has been completely full name in English to express the main process of manufacturing the laser. 1964, in accordance with the well-known scientist Qian proposed that "stimulated emission of light" was renamed "laser." Laser since the 20th century, following the atomic energy, computers, semiconductors, the human and very, very important [1] great invention, known as the "fastest knife," "the most accurate of the foot," "the brightest light" and "strange laser." It's brightness of the sun's 10 billion times. Its principle was early in 1916 the famous American physicist Albert Einstein discovered, but until 1960 was ...
... only the first successful laser manufacturing. Laser is in a theoretical preparation and production practices in the context of the urgent need emerged, and it come out, you get extraordinary fast development, the development of not only the old laser optical science and optical technology gained a new life, and lead to the emergence of a new industry. 200mW Laser Pointer has the function of quick starting.

Laser allows people to effectively use advanced methods and means unprecedented, unparalleled benefits and to get results, so as to promote the development of productivity. 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. The interaction between light and matter, 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 the state (or simply stated as at a certain level on). Interaction with the photon, the particle transition from one energy level to another level, and the corresponding photon absorption or emission. Photon energy values for this two-level energy difference △ E, frequency = △ E / h (h is Planck's constant). 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, and this transition to higher energy corresponding to level. This transition is called stimulated absorption. 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) transition, while radiating energy (E2-E1) photon, the photon frequency = (E2-E1) / h. 100mW laser pointer has no radiation towards the human body.

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. 1917 Einstein's theory that: 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. 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. This unique design make Blue Laser Pointer very special. 1917 Einstein proposed 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. Substances in thermal equilibrium, the particle distribution on each level, follow the equilibrium statistical distribution of particles under the law. By statistical distribution of the lower energy level E1 in the number of particles at the higher level must be greater than the number of particles of E2. This light passes through the working substance, the light energy will weaken not strengthen. Here is the technical characteristic of 5mW laser pointer.
 
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