Range of a 3w laser pointer
Lay persons often ask what is the range of a laser pointer is, and responding to this interest some producers specify some more or less questionable numbers.If the question is meant to be how far the light of a laser pointer can propagate, the correct answer is that there is no limit, provided that the light is not absorbed or scattered away in the atmosphere. However, the beam area will eventually become larger due to the beam divergence, so that the intensity e.g. on a screen will be reduced even if the overall power remains constant. Accordingly, an airplane pilot looking down into such a beam from an altitude of 10 km will not be disturbed by the remaining small intensity.Lasers are rapidly getting cheaper, smaller and better. CD, DVD and BluRay players all brought lasers to use for our entertainment. In science, amazing laser imaging techniques were recognised with the Nobel Prize for Chemistry in 2014. In manufacturing, low cost laser cutting machines are increasingly available in small companies, universities and even schools.But increasing ease of use can bring with it the danger of misuse, whether deliberate or accidental. Concern is growing over the safe use of small, battery powered, hand held lasers. For example, there are now thousands of incidents every year of aircraft pilots being targeted by lasers from the ground close to airports, with some suffering serious eye damage.This wilful and illegal misuse highlights the potential for accidents too. Our eyes are highly developed to see in great detail and also in very low light, but these very qualities make them vulnerable to damage from light, too. high power green laser are classified according to whether they present a danger to the eye, with classes 1 and 2 being safe in normal use, but how often do we check that a new media player has its correct "class 1 laser product" sticker?
Both the US FDA and the EU are trying to remove hazardous lasers from the consumer field, but regulation and enforcement will need to be matched by a public willingness to understand the level of danger.If high power lasers are as widespread as they seem, some may ask, why is there not already public outcry following a stream of laser injuries? Well, to harm your eye the laser needs to shine through the pupil, which highlights the most difficult part of raising awareness of laser safety. Your pupil is a very small area and so a beam shining around a room is very unlikely to hit exactly that spot. Most of the time nothing happens, but if it does, the result can be life changing.For airline pilots, hazard comes even without permanent eye damage. A bright light entering the cockpit during take-off or landing can cause a distraction – and even a brief distraction during these crucial parts of a flight has the potential to cause serious consequences. In the US the FAA provide guidance for airline pilots on laser hazards. Some safety specialists offer glasses which can block the most common laser colours, but this can also change how the cockpit controls look to the pilot.As our lives become more and more surrounded by laser 3000mw – they even drive BMW's latest car headlamps – we need seriously to understand them. In the mean time, if you want a laser pointer, make sure you get one that is properly certified (CE marked with a yellow and black label in the EU). It may cost more, but you will know it is safe.
Have you ever been outside under a clear starry sky with a friend or family member, when you wanted to point out the location of the Orion Nebula, or trace the outline of the Sagittarius "Teapot" asterism? You point your finger, but that just doesn't cut it. "Where are you pointing? Do you mean the third bright star up from that middle pine tree over there?" Save yourself from frustration and take the guesswork out of the equation with the Orion SkyLine Deluxe Green Laser Pointer. Its bright green beam makes pointing out objects in the sky as easy as pie. The Orion SkyLine Deluxe Green Laser Pointer is perfect for stargazers. It emits a thin but distinct green laser beam that appears to stretch all the way to the stars! SkyLine's < 5mW green beam just keeps going and going, seemingly to infinity. It works in light-polluted or moonlit skies just as well as crystal-clear skies in remote locations. It's great for pointing out stars, planets, constellations and more for others to see. The SkyLine Deluxe now uses electronic feedback regulation to ensure ultra-stable beam intensity compared to other green lasers on the market, even in cold temperatures.
The aluminum 20mW Green laser Pointer Pen body is 6" long and features a convenient pocket clip. Two AAA batteries are included.
The next higher class, IIIb ranges from 5 to 500 mW. You can also legally purchase this class of laser in the United States. But there are restrictions on it's use, because these lasers are capable of permanently damaging vision. You can't use it in an environment where the beam could escape to the outside. To be explicit here, this means you can't legally use them outside. Now you may want to adopt a "no blood, no foul" attitude, and that's fine for you. But just know that if you ever make a mistake, or run into a narrow-minded individual, you don't have a legal leg to stand on - prepare for a good screwing. Furthermore, based on my own <5mW product, there is no reason outside of inferiority complex to get a higher power product for astronomical use.So how safe are these things (the sub-5mW class IIIa version)? They won't burn you. They won't cause permanent eye damage. Tests were performed on individuals who were scheduled to have an eye removed for medical reasons. For the purposes of the test, the eye was normally functioning. Test subjects stared directly at 5 mW lasers with there to-be-removed eye for five to fifteen minutes from various angles. No permanent eye damage occured. Some changes in tissue were noticed. Of course, in a real-world incident, 500mw green laser light entering the eye would likely last for less than one second, as people naturally look away from bright things and close their eyes, so there is no real danger of direct damage.