Laser Pointer
Laser Pointer
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how strong does a laser pointer have to be to permanently injure eyes?
i'm thinking about purchasing a laser pointer and have found out that some of these can burn through dark plastic, pop balloons, light candles and matches, and sting skin.
however i don't want to hurt anyone or myself. so how strong does a laser pointer have to be to hurt an eye? how long does it have to be on the eye?
if it's an accidental second or two will it do permanent harm?
There are two limits you need to worry about. The first, the eye damage threshold, is about 1 mW. This is actually a fairly low powered laser pointer, as laser pointers go. But at 1 mW, the laser can and will damage your eyes if you stare into it. However, most visible lasers are considered relatively safe under 5 mW. That is because for lasers at this power, though they have more power than needed to injure your eye, the damage occurs slower than you blink. So your automatic reflex will be to blink and look away before substantial damage can occur. This makes these types of lasers relatively safe. Now, without a doubt, if you stare into such a laser and try to ignore your blink reflex, you can certainly damage your vision with such a laser. Above 5 mW, the damage occurs faster than you can blink, so those lasers are not considered safe.
To put this in prospective, the sun will give you about as much power as a 1 mW laser. And, of course, you aren't supposed to stare into either light source. For something to pop balloons, you need somewhere around 100 mW, which is well over the 5 mW blink-threshold and will instantly do permanent damage to your visions. For a laser to hurt when you shine it on your skin, you need around 500 mW, which is a very powerful laser and can light up a room very easily.
All of this depends on many factors, like the beam diameter, if there is any sort of focusing, and to some extent, the wavelength of the laser. For example, a 1 mW ultraviolet or infrared laser is considered dangerous because you don't have a blink reflex for these invisible wavelengths. But for visible lasers, the numbers I gave you are appropriate for the typical beams you get from laser pointers.
And in no circumstances (unless directed by a doctor) should you stare into any laser beam, and you should always avoid eye contact.
As far as the optometric physician, who said that laser are legally mandated to be safe, he doesn't know what he is talking about. Are all knives safe? As a physicist who deals with unsafe lasers every day, I can tell you that without a doubt, most legal lasers pointers can and will damage your eyes if you stare into them or ingore simple safety steps.
Green Laser Pointers - Which One Should I Choose?
Just by typing in the word "laser pointer" into google's search engine, you will find hundreds of laser pointer companies out there. Some have very attractive websites with very high prices. Some laser pointers offer the same functions and power but are much cheaper. It's all very confusing especially when you don't understand what all the terms mean. You're about to spend a good amount of money on a laser pointer, the least you should is do some research before choosing the right laser and right company for your needs.
The first thing you will notice about high powered green laser pointers is they are always categorized by power. This is the number with "mW" at the end. mW stands for milli-watts and is 1/1000 of a watt, that is, 1000mW is 1W. You will also see another number associated with green laser pointers. This number has "nm" at the end. This stands for nano-meters and is used to measure wavelength. You really don't have to look into this number too much as all green laser pointers have a wavelength of 532nm. Pretty much, when you see 532nm, you should automatically think of the color green.
Now, lets focus on power. This is probably the most important factor because the more power you buy, the more money you spend. Yes, power is expensive! You need to ask yourself, what are you buying this laser pointer for? I think I can categories this into 3 types of lasers.
The first type, you're looking to buy something for everyday use. You're a teacher, professor, or someone always doing presentations in large groups. You are looking to use the green laser pointer as a "pointer". Good, I can make the decision for you now. Get a 5mw green laser pointer. While you could buy something more powerful, I wouldn't suggest getting anything over 20mW if pointing is all you will be doing. 5mW is for small classroom pointing, 20mw is for longer distance pointing as in an auditorium. Now, I'm talking about real laser pointers, that is, don't buy from ebay or any auction sites. Their advertised output is usually fake. If you buy a 5mW, you'll probably end up with a 1-2mW green laser. You can search the term "Skylasers" in google, they are a good reputable company.
Now, the second type is looking for a visible beam green laser pointer. First question, are you looking to burn or melt anything with it? If you answer is no, stick with a green laser pointer between 20mW to 80mW. During the day, these lasers have a very bright end dot (the laser beam is not visible). Realize that you will not find a laser pointer with a visible beam during the day. At night, however, a 20-80mw green laser is very bright! Yes, amazingly bright! This is where I ask, how much do you plan on spending? The more power you buy, the brighter the laser pointer. On a personal note, I would recommend a 40 - 60mW green laser pointer if all you want is a bright beam. The 20mW is still slightly dim for me. 40mW to 60mW green laser pointers go for around $100-$150. If you have the money, go for the 80mW, you will notice the difference in brightness. I just think 40mW - 60mW is plenty bright though.
If you are looking to burn and melt with this laser, you need something above 100mW. Want to see laser pointers in action? Simple, go to youtube and search for "lasers". You will find green laser pointers from various companies lighting cigarettes, popping balloons, etc. There are some very cool videos out there. The question now is, what do you want to burn? Again, the more power you have, the faster your laser will burn and melt. You can buy green laser pointers with more then 500mw these days that could cost you a pretty penny. It's really up to you as to how much you want to spend. If burning is your thing, look around for reliable companies and compare prices. Buy something you are comfortable with spending.
There are several laser pointer forums out there that can be very resourceful to you. Stick with www.laserpointerforums.com, www.photonlexicon, and www.candlepoweredforums.com. These forums have a good following and members are generally very eager to answer your questions. I suggest staying away from www.lasercommunity.com, this forum is very tightly monitored and is run by a laser company. They do not allow members talking about other laser companies...
About the Author
Green laser pointers have been a hobby of mine for a number of years. I hope my articles are useful to you and good luck in your search for the perfect laser pointer!
If you are a laser enthusiast like me and is interested in learning about the physics behind lasers, check out how lasers work!
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