So that the moisture will not influence the quality of the material of green laser pointer

Can also be made firearms shooting aimed at indicating device, due to their design that fits in the barrel sights, so that the barrel parallel to the base, you can "refers to what to play where", eliminating the need for narrowing his eyes quasi-rear sight gap and sight "three-point into the front line of the trouble. Foreign countries have been equipped as a standard equipment of the riot police gun, was shot, you can use the laser beam indicates a warning, but also with a laser beam to guide the shot, has a strong deterrent. China's Taipei into a beneficial enterprise, to develop indicators of the direction of the camera. The laser power of green laser pointer  can be calculated.
The camera direction indicator has a shutter linkage to prevent the intake of the film the light of the laser beam scattering. Such a device is particularly useful in 抢拍 moving target because the target light point in line with the requirements of the photographer pressing the shutter to avoid Gongyao bent knees tracking the target in the camera level as the viewfinder labors. The laser optical fiber communication is much in the early 18th century, a worker in the labor inadvertently observed the pipes in the water to guide light. Long after, a Greek workers also found that light can not only quickly from the glass thin rods at one end to another end, but did not diverge to the rod outer space, like the flow of water in the water. It is according to the real power of   green laser pointer   .
It is long known that the phenomenon of the light guide, but high-quality coherent light source, low-loss glass fiber materials, so people just use ordinary glass with ordinary light, the total reflection and refraction of light presentation and testing. Laser appeared in 1960, graduated in 1966 from the University of London, 33-year-old British Chinese scientists Kun, published an article entitled "Insulation Dielectric fiber surface waveguides," the paper suitable for light frequency, the first time the problems of glass purity and composition will be able to get the doctrine of low-loss optical transmission of the glass fiber. According to this theory, Corning Incorporated, USA in 1970 first proposed light consumption of 20 dB / km fiber-optic vision, from the field of fiber research and production gradually become active again. It has much experience in dealing with the large quantity order of green laser pointer .
To the 1980s, fiber-optic technology has formed a considerable scale industry has reached a practical stage. So-called "optical fiber" is actually thinner than a human hair fiber glass wire, cylindrical structure, in the middle of a diameter of 8 microns or 50 microns core, outside wrapped with core refractive index with the foreskin, to ensure the realization of total internal reflection within the fiber. And then coated with a plastic sheath, the outer diameter of 125 microns. Like ordinary metal wire, stranded made of fiber optic cable. A fiber optic cable through the tens of thousands of telephone channels or dozens of road color television programs, is a 144-core fiber optic cable, such as the United States. Communication equipment used in optical fiber communication, the structure compared to laser atmospheric communication equipment, in addition to the coding and modulation system, abolished the targeting system. More time and attention should be paid to dispose the order of   laser pointer   well.
The transmit and receive antennas also simplifies the integrated coupler, laser communication equipment directly coupled to the fiber optic cable. In addition, long-distance transmission, optical relay amplifier is essential. Although the laser optical fiber communication has developed quite late, but due to the huge market-driven, has become one of the pillars of modern communications, and increasingly prosperous trend. The United States early in 1988, laying of success across the Atlantic, the capacity of the 3? 20000 bidirectional, TAT-8 undersea fiber optic cable communications engineering. Japan's Economic Planning Agency 2010 technical study predicts will be "on July 18, 1991 report requirement after the year 2010 ultra-high density, ultra-high-speed" too bit optical communication systems "put to practical. Therefore, the quality control is very important for the large quantity order of  green laser     .
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