Class 4 lasers must be equipped with a key switch and a safety interlock. It’s a misconception that all dangerous encounters happen in dark conditions, and most shooters primarily practice on well-lit ranges where ambient light is sufficient to use iron sights. Moderate and high-power lasers are potentially hazardous because they can burn the retina of the eye, or even the skin. However, there are a few significant exceptions. You just don't find the ultra low UV wavelengths in handhelds so that kind of rules those out of being included in this question.i meant to say hand held laser... sorry gals n girls Well being in the way of the military's laser that shoots down projectiles, or one of the giant building size lasers would be the worst...We know you're talking about a handheld Even among the handhelds the most dangerous are IR pointers for the reasons mentioned above (there are handheld pointers> 2W).Blue is also dangerous as it too looks less bright then it really is, and it's more readily absorbed by skin or retina. Many lasers are high voltage devices, typically 400 V upward for a small 5 mJ pulsed laser, and exceeding many kilovolts in higher powered lasers. This means the maximum permissible exposure (MPE) cannot be exceeded when viewing a laser with the naked eye or with the aid of typical magnifying optics (e.g. Clear answers for common questions 142(36):1979–82Mainster, M.A., Stuck, B.E. Class 1M lasers produce large-diameter beams, or beams that are divergent. Such visible fault finders are usually classified as Class 2 up to 1 mW, and Class 2M up to 10 mW. anon87709: If you aimed 100 laser pointers at the same spot, yes, the spot would have 100 times the laser energy on that spot. Mole removal and scars A mole removal treatment will leave some scarring. This is the most hazardous classification.

And don't go playing with your cat with a 405nm laser too much. And Bob is also certainly correct that blue is the most aggressive of the three.
A laser is a machine that makes an amplified, single-colour source of light. Lasers in this category can cause permanent eye damage with exposures of 1/100th of a second or more depending on the strength of the laser. Any system employing typical optical connectors (i.e. Clear answers for common questions These hazards may also apply to indirect or non-specular reflections of the beam, even from apparently matte surfaces – meaning that great care must be taken to control the beam path. ), detection and absorbtion of Infrared is what makes us feel heat. And then the beams spread out slightly onto the retina so the spot is larger.

If you're looking for a more exotic laser, blue or violet is the way to go. It still is dangerous and hazardous; however, the overall hazard is technically less than a single laser that is 100 times more powerful than one of the laser pointers. In practice, accidental exposure to the large majority of installed systems is unlikely to have any health impact, since power levels are usually below 1 mW and the wavelength in the infra-red, e.g. How dangerous are these distance finding lasers?

By definition, a class 4 laser can burn the skin, or cause devastating and permanent eye damage as a result of direct, diffuse or indirect beam viewing. it says its 1000mW and on the side it says 'IIIb' - does that mean it's more powerful and dangerous? They may also include materials released during laser processing, such as metal fumes from cutting or surface treatments of metals or the complex mix of decomposition products produced in the high energy plasma of a laser cutting plastics. Infra kinda goes through .. on the other hand it's much less visible, is it has to be the winner.Hey, at least your post was well thought out and informative Well but would you agree, that 200mW IR is more dangerous than 200mW red. Class two lasers are less powerful, and are a better choice if you are concerned about safety. The lasers occasionally hit me directly in the eye. In addition to the electrical hazards, lasers may create chemical, mechanical, and other hazards specific to particular installations. Green is the least common color, so if you’re green-eyed you’re a rare species! For example, deep-ultraviolet light causes accumulating damage, even at very low powers. Melanoma, the most dangerous type of skin cancer, usually develops from normal skin and not a pre-existing mole. For other wavelengths and for pulsed lasers, other limits apply. Many solid state visible light lasers start as infra red, but progressively pass through lazing mediums that add the photons energy together and emit a new more powerful level of photon, and this process continues to the desired color. Many laser pointers are IIIA devices, meaning that there is a potential for damage with direct exposure to the laser.

By Avery Thompson. A laser can be classified as Class 1M if the power that can pass through the pupil of the naked eye is less than the AEL for Class 1, but the power that can be collected into the eye by typical magnifying optics (as defined in the standard) is higher than the AEL for Class 1 and lower than the AEL for Class 3B.

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