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Laser Pointer Class:
The safety grade of the laser pen is divided into the following four levels:
Class I：
Low output laser (power less than 0.4mW). Regardless of the conditions,it won’t exceed the MPE value to eyes and skin,and even after the focus of the optical system . It is safe in some degreen and you do not have to pay special attention. This class mainly used at geological exploration equipment, laboratory analysis equipment, short distance communication and transmission. Caused the power is less than 0.4mW, it's harmless to the eyes.
Class II：
Low output visual laser (power 0.4mW-1mW). The reaction time of closing the eyes is 0.25 seconds,the exposure can not be more than MPE within this period of time. 1MW laser will usually cause dizziness, so you must not observe the beam observation, or use class II laser irradiat someone else's eyes.This kind of green laser pointer mainly used as classroom demonstration, laser sight and range finder etc.
Class III ：
Middle output laser. It will make light damage if you look into the beam. It can be further divided into IIIA and IIIB.
Class IIIA lasers’ output at a range of 1-5mW, and beam energy density is not more than 25W / Mm. Its typical applications is nealy simialr to Class II , such as laser sight, laser scanner etc..
Class IIIB lasers’output at the range of 5-500mW. This kind of laser can be used as spectral measurement and entertainment lighting, etc..
ClassIV：
High output continuous laser (more than 500mW, the most powerful laser pointer is 30000mw Laser ), this kind of laser pointer can burn matches or cigarettes instantly. It almost used at surgery, research, cutting, welding, and micro machining, etc..
Wavelength and Color
Visible light spectrum wavelength
The wavelength determines the color of the laser and the visibility of the beam.
●Visible laser beam wavelength are as follows: blue violet (405 nm), blue (445nm, 460nm, 473 nm), green (532nm 520 nm), yellow (589nm) orange (593nm) and red (635 nm, 650 nm).
●The ultraviolet radiation has a shorter wavelength than the violet visible light.
●No visible infrared laser (808nm, 980nm, 1064nm) has a longer wavelength than visible red light. But is all of this safe? Can shining laser beams at any time lead to issues or have unfavorable consequences? The solution is sadly Sure. Laser Pointers are not toys, regardless of what many people think about them, and they can not only hurt people or animals, but also direct to authorized trouble as nicely.