The red usa green laser pointer was relatively lower in the cost and price

Various types of solid, gas, semiconductor, and chemical lasers have been successfully developed. In basic research and key technologies, a series of new concepts, new methods and new technologies (such as the cavity Q-mutation and the rotating mirror Q, traveling-wave amplification, the use of rhenium Department of ions, free electron oscillation radiation, etc.) have put forward and get implementation, many of them original. At the same time as the new light source with high brightness, high directivity, high-quality, outstanding features, the laser quickly used in various technical fields, showing strong vitality and competitiveness. Communications, laser show transmission of television images, in September 1964, November 1964, call of 3 to 30 km. The red  usa green laser pointer  was relatively lower in the cost and price.
Industry, in May 1965 laser drilling machine for drawing die punching production, access to significant economic benefits. Medicine, laser retinal welding carried out on animals and clinical trials in June 1965. National defense, in December 1965 to develop successful laser diffuse reflectance rangefinder (accuracy of 10 m / 10 km), developed a remote control pulse laser Doppler velocimetry in April 1966. Classification of the laser hazard class. Observe the maximum possible impact of the MPE (maximal possible effect on the eye based on the risk classification of the laser on the human body, light tree) to do the benchmark can be divided into one to four. Laser product manufacturers should be Class II, III and IV of the warning label to the corresponding laser products. The green laser beam    green laser pointer   is more expensive.
Class I: low output laser (power is less than 0.4mW), regardless of the conditions under which the eyes and skin, will not exceed the MPE value will not exceed the MPE values, even through the optical system is focused. Can guarantee the safety of design, do not need special management. Typical applications such as laser pointer, CD player, CD-ROM devices, geological prospecting equipment and laboratory analysis instruments. Class II: low output visible laser (power 0.4mW-1mW), closed eyes, the reaction time was 0.25 seconds, use this time to calculate the exposure amount can not exceed the MPE values. Usually less than 1mW laser, can cause dizziness not think, and to protect with closed eyes. For the green laser technology of  green laser pointer  is more complicated and the cost of the green laser pointer is higher.
Can not be completely safe, do not directly observed within the beam, do not use Class II. Laser direct exposure to the eyes of others, to avoid observation afar equipment Class II laser. Typical applications such as classroom presentations, laser pointer, aiming devices and range finders. Class III: The output of the laser, the beam directly into the eyes, produces injury, and for some security reasons, and further divided into IIIA and IIIB level. IIIA level for visible continuous laser output for the 1-5mW laser beam, the beam energy density should not exceed 25W / m?? M, to avoid Yuanwang equipment observed IIIA laser, so that may increase the risk. A lot in common, such as laser pointer, laser scanner, a typical application of IIIA and Class II level. The green laser beam  green laser pointer  is mainly used in the engineering architecture and astronomical application.
III B grade for the 5-500mW continuous wave laser, it is dangerous to directly observed within the beam. However, the minimum irradiation distance of 13cm, maximum exposure time of ten seconds the following for safety. Typical applications such as IIIB laser spectrometry and entertainment light shows. ClassIV: continuous wave laser of high output (greater than 500mW), higher than the third level, there is a fire hazard, diffuse reflection is dangerous. Typical applications such as surgery, research, cutting, welding, and micromachining processing. Laser treatment on the security measures. Applications like laser discs for general home or office, or laser printers and other machines, the laser is not injection external structure formation, to ensure safety. And then    green laser pointer  develops more and more.