The laser range of this kind of green laser pointer can reach up to 2miles

Later, the American physicist Charles Townes and the Soviet physicist of Masuo Fu, and the general Huoluo Fu has proposed the use of atoms and molecules stimulated radiation principle for generation and amplification of microwave design. 1954, mentioned earlier, American physicists Townes finally made the first ammonia molecular beam maser (Figure 1.1), successfully pioneered the use of molecular and atomic systems the coherent amplifier or oscillator as a microwave radiation precedent. Townes, who developed the maser produced only 1.25 cm wavelength of the microwave power is very small. Production and continuous development of the need to promote science to explore new fluorescence mechanism, to produce new high performance light source.   green laser pointer     can meet various needs and requirements of different customer.
In 1958, Townes and sister of the maser with the optical, spectral theory of knowledge combine, to put forward the key recommendations of the open resonator, and to prevent the laser coherence, directivity, linewidth and noise properties. During the same period, Basov and general Huoluo Fu, who also made the realization of the principle scheme of the optical amplification by stimulated emission of radiation. Figure 1.1 Ammonia molecular beam maser schematic diagram of a system structure b coke poly device cross-section July 8, 1960, U.S. scientists Maiman invented the ruby laser, from the people can access to nature and similar to the electromagnetic frequency-stable light source. This laser light and ordinary light is not the same, it is subject to the material atomic structure of the directional nature of light, stable frequency, approximately 100 terahertz. And at the same time, different    laser pointer   of multiple and different functions can be adopted by different clients.
The frequency of this light than has been widely used in microwave (frequency about 10 MHz) high frequency of 10,000 times. Figure 1.2 ruby laser in December 1960, the Iranian-born American scientist Jia rate people finally succeeded in creating and running the world's first gas laser - He-Ne laser. In 1962, three groups of scientists almost simultaneously invented the semiconductor laser. In 1966, scientists have developed has become an organic dye laser wavelength can be continuously adjustable over the range. In addition, the output energy, high power, and not dependent on the grid of chemical lasers have come out. Lasers have all the prominent feature of which was soon applied to all aspects of industry, agriculture, precision measurement and detection, communications and information processing, medical, military, and caused a revolutionary breakthrough in many areas.  green laser     can suit various locations for the customer.
For example, people use laser focus on high energy, processing of various materials, can do to drill 200 holes in a needle; laser as a living organism, cause irritation, mutation, burning, vaporization effects means, in the practical application of medical, agricultural and achieved good results; in the communications field, a laser column transmission signal of the light guide cable can carry the equivalent of 20 000 telephone copper wires to carry the amount of information; laser in the military In addition to communications, night vision, warning, ranging on, a variety of laser weapons and laser-guided weapons has also been put into practical use. With further research and development of human laser technology, laser performance will further enhance the cost will be further reduced. The customer can use the   green laser led  in different locations.
But the scope of its applications will continue to expand, and will play a huge role. Optical frequency conversion technology research significance of nonlinear optical (NLO) laser frequency conversion technology is based on the substance of the nonlinear optical effect in the laser field. Material polarization in the optical field, when the light intensity is large dielectric polarization of the light wave electric field Qu relationship also includes the square of the light wave electric field, in addition to containing the original linear, cubic and even several times square related to the nonlinear term. It is these non-linear polarization produced a series of extremely rich variety of nonlinear optical effect. For example, the customer can select  green laser pointer with the star laser head.