I just so happen to be in need of a 1W, 532nm laser pointer!
Are the cheapies (under $100) useful laser pointers, or are the more expensive ones a better choice for a productive use of the laser pointer? Links welcome!
medical (I guess it’s in the range for tattoo removal, but power rating for these lasers are stated weirdly)
fiber optic communications
Tasks 1w lasers are unsuitable for
any kind of pointing, besides cases where you wish to permanently damage your audience.
As I recall the cheap lasers have an issue with the quality of their wavelength. Both in contamination and precision. Which leads glasses not being effective.
medical (I guess it’s in the range for tattoo removal, but power rating for these lasers are stated weirdly)
for those curious (you probably know this though), lots of these are pulsed, primarily to avoid excessive local heating (burning) of the tissue being lased. these can have peak powers in the kilowatt range!
watts are energy (in joules) divided by time (in seconds), and while relating energy to time is helpful for constant-power applications—and even some certain pulsed applications—the timeframe here is often small to the point of not mattering much, and a direct measure of the total energy delivered is ultimately most useful. nonetheless they are very impressive sounding and goofy, like “oh i work with multi-KILOwatt lasers on the daily :3” hehe
any kind of pointing, besides cases where you wish to permanently damage your audience.
for a single one watt beam of light, absolutely! do not bring those to the school show-and-tell. but there are absolutely lasers this (or even more) powerful used in concert settings and so forth. still, you’re very right, care must be taken with them too.
also your point of output contamination is spot on! +1 to avoiding cheap “powerful” lasers :)
lots of these are pulsed, primarily to avoid excessive local heating (burning) of the tissue being lased. these can have peak powers in the kilowatt range!
I just wrote “weird” because trying to explain 250mJ delivered in 15ns became too much math to put into a comment I wanted people to read.
also your point of output contamination is spot on! +1 to avoiding cheap “powerful” lasers :)
That’s what fucking around finds out for you. Luckily I never got to the stage in my project where I put on my budget non-certified goggles, and powered on el cheapo laser diode. But if I can help somebody else to not trust the nominal values, then I’ll chime in when this is brought up.
Honestly, I’ve got no idea what price range is plausible these days. What I do know is, that I would only buy from someone who knows what they’re doing, and who can provide a proper datasheet. But then again I come at this from an electronics angle, so I’d want a datasheet with stats on the beam, like wavelength composition, and heat dissipation etc, and not just forward voltage and current.
If you’re looking to buy a finished product, then figure out what regulatory markings it should have, like UL, CSA, CE, and TÜV. Personally I may be European, but I wouldn’t be satisfied with a CE marking, it must at least have TÜV before I’d mess with it, and I’d prefer it to be UL listed as well. Anybody can slap CE on a product, but UL and TÜV are actual testing institutions.
If you want to use these in an uncontrolled environment, definitely get the appropriate laser safety glasses (such as these) as well, and have anyone you don’t want to blind who are anywhere nearby or in line of sight close their eyes. Even the scattered reflection off glass or the metal of a camera mount can burn people’s retinas permanently, and depending on the surfaces it could scatter a few times and still have enough power to cause damage.
This means if a target is near a highway, you could blind passing motorists. If it’s near buildings, you could blind people peeking from windows.
Treat a 1W laser like a power tool. Amateurs can learn to use them safely, but you want to learn from guides rather than from mistakes.
I just so happen to be in need of a 1W, 532nm laser pointer!
Are the cheapies (under $100) useful laser pointers, or are the more expensive ones a better choice for a productive use of the laser pointer? Links welcome!
Suitable applications of 1w lasers
Tasks 1w lasers are unsuitable for
As I recall the cheap lasers have an issue with the quality of their wavelength. Both in contamination and precision. Which leads glasses not being effective.
for those curious (you probably know this though), lots of these are pulsed, primarily to avoid excessive local heating (burning) of the tissue being lased. these can have peak powers in the kilowatt range!
watts are energy (in joules) divided by time (in seconds), and while relating energy to time is helpful for constant-power applications—and even some certain pulsed applications—the timeframe here is often small to the point of not mattering much, and a direct measure of the total energy delivered is ultimately most useful. nonetheless they are very impressive sounding and goofy, like “oh i work with multi-KILOwatt lasers on the daily :3” hehe
for a single one watt beam of light, absolutely! do not bring those to the school show-and-tell. but there are absolutely lasers this (or even more) powerful used in concert settings and so forth. still, you’re very right, care must be taken with them too.
also your point of output contamination is spot on! +1 to avoiding cheap “powerful” lasers :)
I just wrote “weird” because trying to explain 250mJ delivered in 15ns became too much math to put into a comment I wanted people to read.
That’s what fucking around finds out for you. Luckily I never got to the stage in my project where I put on my budget non-certified goggles, and powered on el cheapo laser diode. But if I can help somebody else to not trust the nominal values, then I’ll chime in when this is brought up.
Any idea where the quality is appropriate for the task? Like a $300 range or like a $2k range?
Honestly, I’ve got no idea what price range is plausible these days. What I do know is, that I would only buy from someone who knows what they’re doing, and who can provide a proper datasheet. But then again I come at this from an electronics angle, so I’d want a datasheet with stats on the beam, like wavelength composition, and heat dissipation etc, and not just forward voltage and current.
If you’re looking to buy a finished product, then figure out what regulatory markings it should have, like UL, CSA, CE, and TÜV. Personally I may be European, but I wouldn’t be satisfied with a CE marking, it must at least have TÜV before I’d mess with it, and I’d prefer it to be UL listed as well. Anybody can slap CE on a product, but UL and TÜV are actual testing institutions.
If you want to use these in an uncontrolled environment, definitely get the appropriate laser safety glasses (such as these) as well, and have anyone you don’t want to blind who are anywhere nearby or in line of sight close their eyes. Even the scattered reflection off glass or the metal of a camera mount can burn people’s retinas permanently, and depending on the surfaces it could scatter a few times and still have enough power to cause damage.
This means if a target is near a highway, you could blind passing motorists. If it’s near buildings, you could blind people peeking from windows.
Treat a 1W laser like a power tool. Amateurs can learn to use them safely, but you want to learn from guides rather than from mistakes.
Sanwu lasers make reputable products