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FrozenGate by Avery

"Noise Halo" on a new 50mW violet laser

ninja_tux

ninja_tux

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Hi, I recently purchased my first "powerful" laser, a 50mW 405nm laser from warnlaser (UV Lasers/Ultraviolet Lasers (Violet laser ) Laser Pointer- Warnlaser.com)
This is the first laser I have owned that is > 5mW in power, so I am not sure if one aspect of its behavior is typical of higher powered lasers. Basically I've noiticed that there is a "noise halo" of sorts around the center dot, so a lot of fuzzy purple light surrounding a central point; this noise seem to exacerbate at longer distances. I was wondering whether or not I should be concerned with this behavior as I only have 5 days to return it for a full refund if this is a manufacturing error.
In the case that it is not, is there any way to reduce the "noise"? It seems at distances more than 15 feet there's a lot of it; maybe it could be resolved with a lens attachment to better focus the beam?
Any help is appreciated!
 





all 405nm lasers do this for my eyes. it is on the edge of the visible light so it is normal for it to look fuzzy :)
-D
 
Thanks for the quick reply! Good to know I'm not the only one who experiences the fuzz haha but I must say the color is quite stunning. Another question though: was paying around $150 for a 50mW a rip off? I just realized that o-like.net has a 100mW for less than half the price with an adjustable lens... -.-
 
Damn...oh well I suppose I can always still return it for the price of the laser at this point and buy from somewhere else... So far I've read good things about O-like; but 100mW, from what i've read, seems to be getting in the range where I'd need to be extremely careful where I point it, no? (Bear with me I'm still a laser noob obviously haha)
 
regardless of power, please ALWAYS be careful where you point a laser.

UV and near UV is very harmful if used recklessly.

Safety first, fun second.
 
photonaholic said:
regardless of power, please ALWAYS be careful where you point a laser.

UV and near UV is very harmful if used recklessly.

Safety first, fun second.
Click to expand...
Ok good advice, I think if I return this laser and buu the O-Like 100mW then I will definitely make sure to buy a pair of safety goggles... Now I guess we shall see how good wrnlaser.com's customer support / return policy is sigh...
 
I have really bad eyes for 405 I think. About 80 feet away there's a tree-when I point my better PHR at it, the dot is very well focused and I can see it. However, there is distortion around it that at night appears to be like a 10 foot wide circle, and it really messes with my vision. Kind of annoying sometimes.
 
ninja_tux said:
Hi, I recently purchased my first "powerful" laser, a 50mW 405nm laser from warnlaser (UV Lasers/Ultraviolet Lasers (Violet laser ) Laser Pointer- Warnlaser.com)
This is the first laser I have owned that is > 5mW in power, so I am not sure if one aspect of its behavior is typical of higher powered lasers. Basically I've noiticed that there is a "noise halo" of sorts around the center dot, so a lot of fuzzy purple light surrounding a central point; this noise seem to exacerbate at longer distances. I was wondering whether or not I should be concerned with this behavior as I only have 5 days to return it for a full refund if this is a manufacturing error.
In the case that it is not, is there any way to reduce the "noise"? It seems at distances more than 15 feet there's a lot of it; maybe it could be resolved with a lens attachment to better focus the beam?
Any help is appreciated!
Click to expand...

This is typical of some kinds of laser diodes. I have seen open can type burners do this too.
 
It's your eyes, and their inability to focus well on the dot.

To prove it to yourself, a simple experiment: point the laser at something a distance away, so you see the halo. Then leave the laser at that location (leave it on, with a clip or a friend holding the button), and walk up closer to the dot on the wall. You'll see that the laser dot is fine once you're close to the dot, even though from far away it has the halo.

The halo is not a function of the laser's distance from the wall, it's a function of your eye's distance from the wall.
 
To add to this post.
If you wear glasses (not UV coated) you will get a very weird artifact around your 405nm beam.
As you rotate your head, the artifact will circle around the dot in a 360 degree movement.
I thought something was wrong with my eyes when I first noticed this. This was when HID headlights first came out on cars. I don't know how much UV they produce, but man is that distracting when driving!
It was not until I ordered my glasses W/UV guard, did I figure it out.
 
Violets are fun, bur I've found kinda useless... VERY fun with glow in the dark and flourescent things!!! And ya, the halo is normal. And ya, hope they let you return it, o-like is better lol.
 
You've been around here long enough, you should know Warnlaser is a rip off.

Put on a pair of sunglasses and the halo will disappear.

Note: Sunglasses are not a substitute for laser goggles.
 
Sorry for the old post, but for anyone that is curious, warnlaser DOES in fact honor their return policy; once they received the laser they refunded the price minus shipping. I do not suggest buying anything from them though...as many people have stated they are ridiculously overpriced.
 
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