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Because the IR is invisible, any bounced beam may damage your eyes and you can not see the path of the light beams, which causes them to be extremely dangerous. Furthermore although usases goggles for the eyes, the goggles only protect the visible wavelength of the laser, either 532nm in case of green, or 650nm in red for example, so that the invisible light of infrared happen without problem through glasses irreparably harming you the view.
Colors of Laser Pointers - Back to Index
The 'naked' is the unit of length equal to one billionth of a meter. 
It is commonly used to measure the wavelength of ultraviolet radiation, infrared radiation and light. The symbol is nm nm.
Laser pointers obviously due to its function always emit in the visible range much of its beam, although depending on the quality of the laser this part will more or less. 
The color of the beam of a laser is determined by the wavelength of the light emitted by the laser diode pointer.
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Wavelength of laser pointers

 

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• 405nm: violet red next to the less visible to the human eye. 
• 445nm: Blue, quite visible especially at close range. 
• 532nm: green, the brightest of all, highly visible and sensitive for view 
• 650nm: Red color, harder to see than others. 
• 880nm: Color Infrared (IR), invisible to the human eye.
Laser pointers sold in several different colors: red and green, are the most common, but are also found in blue, violet or yellow / orange. 
4. Powers of Laser Pointers - Back to Index
The output powers range from 1 mW (milliwatt) to 2 watts.
In daylight, the human eye is unable to detect the light beam exiting the laser pointer. That beam usually 1 millimeter in diameter if it is perfectly visible at night and logically be more noticeable the greater its output, reaching the beam to have a distance of over 10 kilometers. Another important thing to note is that the human eye is more sensitive to low levels in the spectrum of the green region (with wavelengths of 520-570 nm). Sensitivity decreases with wavelengths ranging from red to blue. So if we compare laser pointers of the same power, will always be stylo laserthan the other two color beam.
So the first question to ask when deciding the color of a pointer is why we will use?
-For Presentations or conferences, it would be with a red laser pointer with outputs of 50 to 100mW (milliwatts) or green 20 to 50mW will be more than enough, besides being the most economical.

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If you need to use a set between presentations or conferences and occasionally point out stars in the sky or distant objects or used for night photography it is lampe de poche laser
-For Specific use in astronomy or night vision or helps spearfishing, we must choose a green laser with more power, for example 100 or 200mW. In the evening, depending on weather conditions, its beam will have a length of more than 5 kilometers away.
If we want to experiment with the burning of objects, green is the least likely for its constructive and we have to choose red or violet one of 300 to 500mW or one blue 1 or 2 W of power.
This is a key factor in leading, because depending on the color chosen, we will need more or less power, according to the use we want to give you.
The milliwatt, abbreviated English (mW), is a submultiple of the power unit of the International System of Units, known as Watt or Watt and whose symbol is W.
The output power of electrical appliances is expressed in watts, or are less powerful as most laser pointers, used its submultiple the milliwatt is equivalent to one thousandth of a watt.
That is, a laser pointer 200mW power is the same as 0.2W. Do not confuse mW (milliwatts) with MW (megawatts).
A red power 300-500mw pointer is great for burning things and beam, visible hundreds of meters. Usually they allow continued use of a couple of minutes off after 15 seconds.
However, a real 50mW green pointer is brighter than a red pointer 200mW, the beam is sharper and goes further.200mW green one is comparable in intensity to one blue 1W. For guiding telescopes powers of 200mW or higher it is recommended, reaching the beam having a length of more than 7 km.
Blue pointers usually 1W or 2W power, which can burn almost all kinds of things and beam reaching distances of 5 kilometers.
The infrared powers under 500mW can burn easily and black plastic objects; with power of 1W or 2W they can burn almost anything and 3W can reach a fire on certain things like cardboard.
Violet over 100mW and can burn things if it focuses perfectly in order and is at a relatively short distance, ie 5 to 20 cm. and if we point to something we can make phosphorescent take much brighter.

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5. Classification of Laser Pointers - Back to Index
Laser products, taking into account the wavelength, energy content and pulse characteristics of a laser beam are classified into the following classes:
-Class 1: laser pas cher are safe in all reasonably foreseeable conditions of use, where the radiant laser accessible (the accessible emission) energy beam is always below or equal to the maximum permissible exposure value. Therefore, for Class 1 laser, the output power is below the level at which it is believed eye damage to occur. Exposure to the beam of a Class 1 laser will not result in eye injury. Laser class 1 can therefore be considered safe. However, Class 1 laser products may contain laser systems of a higher class, but have sufficient control measures to ensure that access to the beam is not reasonably likely during normal use of the system. Examples of such products include laser printers and compact disc players (CD, DVD, Blu Ray, etc.)

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Class 1M Laser class 1M are products that produce a highly divergent beam or pointeur laser vert 10000mw. Therefore, only a small part of the whole laser beam can enter the eye. However, these laser products can be harmful to the eye if the beam is viewed with optical magnification. Some of the lasers used for communication systems fiber laser products are Class 1 M.
-Class 2: are the products that emit visible laser radiation in the range of wavelengths between 400 and 700nm (nanometers). Eye protection is normally achieved by pushing the eye, including the blink reflex (instinctive closing of the eyelids), however, should take precautions to avoid direct beam continuous view. Class 2 lasers are limited to a maximum output power of 1mW or thousandth of a watt (abbreviated mW). A person receiving exposure in the eyes of a laser beam of class 2, either accidentally or as a result of a deliberate action of another person (misuse) will be protected from injury by the very natural aversion response. It is a natural reaction that causes involuntary individuals to avoid flashing and his head, so that short exposure to the eyes. Repeated or deliberate exposure of the laser beam can not be sure. Some laser pointers and barcode scanners are Class 2 laser products.
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