Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

Possible Dangers of Blue and Violet Lasers?






diachi

0
Joined
Feb 22, 2008
Messages
9,700
Points
113
I have never gotten a clear answer to my question: do 405nm and/or 445nm laser diodes emit ultraviolet light? I assume many 405nm and 445nm laser diodes are multimode, meaning more than one wavelength of light is produced. (UVA begins at 400nm.) Do these diodes produce UV light? Are these diodes harmful to us (our skin) or are they completely safe? I know UVA is not extremely dangerous compared to UVB, but still, what are the risks? Thanks

No, they don't emit UV light.

Multimode doesn't mean they are lasing at multiple wavelengths (Although, there will be a couple of wavelengths some fraction of a nanometer apart).

Not sure where you got the idea that they'd emit UV.

All of the diodes we use emit the wavelength they say they do and no appreciable amount of any other wavelength.
 
Last edited:
Joined
Jan 29, 2014
Messages
12,031
Points
113
I am sure there are threads with the same answering another, making comments agreeing or disagreeing.... I've seen some appear legit by asking about buying something from a member, as if legit, then backing out saying they bought from some other source to cover their tracks. I've almost had enough of it, about ready to take a long nap fellows.
 
Joined
Oct 11, 2016
Messages
807
Points
43
I think I have some of that lying in a box somewhere! Maybe I'll make my own laser diode! :whistle:
I think what you're thinking about is steel wool. :crackup::undecided:
That stuff works a trick for coherent beams! :eg:

On another note I think it's probably the same dude from the banana peels thread. :(
 
Joined
Jan 29, 2014
Messages
12,031
Points
113
Seems we are having a lot of posts lately about how dangerous lasers are, whether unfocused IR, blue or violet wavelength etc... Even a 5 mw laser pointer can harm your vision if you stare at it long enough without blinking, nothing new. Seems more like trolling to me than serious questions, to ask that question you probably already know blue and UV have their own unique hazards though, due to the wavelength. Asking if whether a 405nm laser pointer produces UV after just having stated they knew UV starts at 400nm and shorter seems a give away it is a troll right there.
 
Joined
May 30, 2016
Messages
964
Points
0
I have never gotten a clear answer to my question: do 405nm and/or 445nm laser diodes emit ultraviolet light? I assume many 405nm and 445nm laser diodes are multimode, meaning more than one wavelength of light is produced. (UVA begins at 400nm.) Do these diodes produce UV light? Are these diodes harmful to us (our skin) or are they completely safe? I know UVA is not extremely dangerous compared to UVB, but still, what are the risks? Thanks

Tanning with a 405nm laser will give you spotty results and take forever. I suggest you tan after the Gym but before you do the laundry. And do not use a laser during any of this.
 
Joined
Jan 29, 2014
Messages
12,031
Points
113
I'm waiting for a sock attack if this guy gets miffed, but right now I think he is building reps in preparation for it. CrazLaser, forgive me, but so far I have thought you might actually be one of this guys puppets, I mean, if he is going to choose a persona here, a high school student etc. is perfect, easier to feel for them if they are not treated right. It's just the name you choose, too close to CrazyJay, there are other new members here who also make me wonder, Jhop, might also be completely innocent of such but "J" hop reminds me of Crazy Jay hoping around with different member names. OK, I said it, I won't reference that again with you two guys, but anymore I don't take anything for granted in forums, not until I have seen more verified interactions. It is sad a guy has so much time on his hands to play games, that his world revolves around righting the wrong he believes happened to him in the forum, but I understand, if you don't have a life outside of the internet, that is where you go, whether positive or negative interactions, it is still some kind of interaction with people.

I too have put too much time into hanging around this forum, should probably cool it and concentrate on real life more.
 
Joined
Sep 5, 2013
Messages
8,549
Points
113
Really, the only dangers you'll find associated with visible light is near the 400nm portion of it, and even then, if you exercise proper caution 405nm lasers are perfectly safe. You won't get sunburned by having a 405nm laser hit your skin for an instant!

Anything below 350nm is where you should start to get paranoid if the beam hits you. :)

-Alex
 
Last edited:
  • Like
Reactions: GSS
Joined
Dec 15, 2014
Messages
6,775
Points
113
Hi,
I agree blue and violet lasers are dangerous only because they are addicting and i just want to build more of them. I need dis .....

Rich:)
 

Attachments

  • IMG_2195.JPG
    IMG_2195.JPG
    174.9 KB · Views: 42

GSS

0
Joined
Apr 28, 2015
Messages
5,053
Points
113
Moto154, I think you should do a little "about me" intro. Member's seem to be 50-50 on to your true identity, plus not sure because your not replying, could be your weary because of the reply's to this thread and would hate to see your truly trying to learn;)
 




Top