Questions about UV laser <30mW by 405nm (not visible?)

DJ Baker · Feb 3, 2011

So I just bought a UV laser from amazon.com

Its pretty wicked but its not what I was hoping for it to be. I was looking for a laser that I'd be able to see without the aid of smoke machines and whatnot. I used to own a green laser that I was able to see but, I lost it due to an unfortunate situation. Anywho, what do I need as far as qualifications for a laser to be visible when its dark outside. Or possibly during the daytime. I have been reading about mW and nm, so far i've gathered that nm is what color the laser is and mW would I guess be the power of the laser. Right now the specs for my laser is <30mW and 405nm yet I'm only able to see a very faint stream of the laser. Is this due to the color? Or is it stirctly because the mW is not high enough. Also, any recomendations (if I need to return this one) on what would give me the visible stream? It must be able to be purchased on amazon.com because, once I return it. I'm almost positive I'll be getting just store credit back.

Thanks a ton for your help

Leodahsan · Feb 3, 2011

405nm is pretty weak, try pointing it to some white paper. 405nm isn't UV, it is barely purple.

DJ Baker · Feb 3, 2011

It is able to be seen at the point of focus but i want to see the stream and i was wondering what i need to look for in order for that to happen cause my laser i can't see it in the air (the stream) like do i have to have a higher mW? Or what

Leodahsan · Feb 3, 2011

You want to see the light beam? Well well with 30mW I don't think it is possible. It is normal that it isn't very visible.
if you are DJ and want some laser for special effects and so, you need to learn about safety first and buy a 445nm one. It is a beautiful blue and very visible.

DJ Baker · Feb 3, 2011

The laser that I used to have was a green one and I could see the stream in the air pretty well. I bought this one hoping that I could see the laser in the air still yet it be UV so I could make things glow as well, without the assistance of smoke or fog. Its not so much a question of the color, I just wanted a laser that I could see stream still. I was wondering if it was cause it was 30mW that was the cause of it or if it was just cause the nm was not high enough

DJ Baker · Feb 3, 2011

I'm not able to find any that have a higher mW than 30 with the UV so I was gonna try to send it back for a green one with a higher mW so I could see it. Unfortunately I'm not very knowledgible with lasers so I came here to find out exactly what it was that I needed in order to get that effect

Leodahsan · Feb 3, 2011

Green is at least 100 times more visible than blue, at same power. 532 is VERY NEAR the peak eye sensitivity. If you paid VERY little for it, you may sell it to someone (make a pen with it) and buy a green module.

DJ Baker · Feb 3, 2011

So the mW doesn't matter its the nm? Okay so i'll just keep the one I got and save up to buy one that is green. Thanks a lot, I knew this was the right place to go to lol

Leodahsan · Feb 3, 2011

No no, the mW and the nm matter. If you get a 405nm with 100mW, it will have a visible beam at night. if you have 5mW 532nm, it will be visible too. in the other hand, 200mW 660nm will be hard to see, and 1mW 532nm will be same visible than 200mW of 660nm.

DJ Baker · Feb 3, 2011

Interesting...I'll save this information so that I make sure it meets the correct range. When I end up buying one i'll post the information on the website so I can make sure its the correct range. I really want one that I can make the image change from a single point to a wide spread it would be really cool to get one like that. I saw someone at a rave who had one like that and even when it was spread you could still see the laser pretty well so it looked like a cone coming out of the laser pointer...very cool. Laser was very visible as well much brighter than my old green one. Almost too bright lol. Thanks again for this information you've been very helpful. I'll make sure to let people know about this website for future use.

DJ Baker · Feb 3, 2011

Once I get the laser I need I'll be sure to support the site with a 10 dollar tip =D

Leodahsan · Feb 3, 2011

that what you said

I really want one that I can make the image change from a single point to a wide spread

is called a focusable laser.

Thanks for donating, hope you really do what you said.

DJ Baker · Feb 3, 2011

I'm looking at the website you have in the donations page. I was thinking maybe i'll purchase a laser from there. I'm noticing that some of them burn things? Whats the lowest powered laser thats still visible, that won't burn things. I am not trying to use the laser to injure anyone infact, doing so could really get me in trouble, being a DJ and all. This is the laser I was looking at Focusable Laser but, it says that it will burn things...are there any that can focus, that I can still see, that won't burn people? Don't worry I'll use your link so you guys will make some profit off it =D

Leodahsan · Feb 3, 2011

Site on the donation page? you got it wrong. It is the donation page from this forum, and I'm in no way responsible for it and so. The site you may be speaking about may be the banners, and I have no clue about they.

if you want a low powered laser with a visible beam in no smoke, very dark environment you can stick to 5mW green (532nm). for more visibility, get 50mW or more, just be careful with the eyes. you will probably want a module rather than a portable laser. you can get quality ones at o-like (Welcome to O-Like.com, Your source for laser products) or rayfoss (www.rayfoss.com). At dealextreme you can get good modules until 50mW at most. more than that and the modules are crap.

DJ Baker · Feb 3, 2011

I was talking about this portion http://laserpointerforums.com/donations.htm it says •If you happen to be buying a laser or other product from DealExtreme.com, click here first so I can earn DX points. Then I can convert my DX points into cash and use it to support the forum.

This is what I was gonna do to help out. If not then I'll just use your link and just give you guys some cash, I just feel the need since you've been so helpful

DJ Baker · Feb 4, 2011

I don't want a module cause my company has plenty of performance lasers. This is more for my own personal pleasure ^_^. I just don't want one that could hurt someone if it is accidently pointed at them or on their body...or worst burn equipment that we have haha

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