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Old 02-19-2010, 02:02 AM #1
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Default Can I change colours with this?

Hi, I'm new to lasers and want to get into it a little. This forum is quite extensive as are the lasers discussed. So there is quite a lot to take in.

I primaraly want a laser capable of burning so I have ordered one of these-http://cgi.ebay.com.au/High-Power-Laser-Module-260-mw-Cutting-Burning_W0QQitemZ180446582143QQcmdZViewItemQQptZLH _DefaultDomain_0?hash=item2a0374557f

I can picture some of you maybe rolling your eyes but anyway... I bought it cause it seemed cheap, it has a host/heatsink, laser, module and driver circut.I don't know if the one I have ordered is well known but I want to know a few things about it.

1-I need to get some glasses but haven't really looked into it so I don't know what I need.

2-It says adjustable lens, can I get different lenses for it if needed (patterned)

3-The driver circut is used in there 450mw version so I assume it is variable, in which case I could use different diodes yeh? Can I change *nm and get a different colour with no other hardware changes?

Your help is appreciated


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Old 02-19-2010, 02:12 AM #2
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Default Re: Can I change colours with this?

I highly recommend a new user stay away from this, and any Infrared lasers! -Glenn
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Old 02-19-2010, 02:16 AM #3
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Default Re: Can I change colours with this?

Do you realize that 780nm is INVISIBLE Infra-Red light?

You bought a laser that you cannot see the beam.

And, No. You cannot change the color

Peace,
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Old 02-19-2010, 02:25 AM #4
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Default Re: Can I change colours with this?

That just shows my ignorance then

Thanks for the reply anyways.
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Old 02-19-2010, 02:27 AM #5
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Default Re: Can I change colours with this?

Please read this stuff, it will really help you out in the end. That laser is dangerous, especially since you cannot see it, it will burn your eyes out without you ever knowing it, if you look into the end of it "hey where is the light" BLAM your eyes are damaged.

I have compiled a list of "must read" information, it will make your time with us more productive and pleasant.

Laser Resources (for n00bs and veterans alike!)

http://laserpointerforums.com/f36/lo...-me-47684.html

Sam's Laser FAQ (The Laser Bible)

Sam's Laser FAQ - Preface, Introduction, What is a Laser?, Safety

RP Photonics Encyclopedia of Laser Physics and Technology

Encyclopedia of Laser Physics and Technology - an Open Access Resource of In-Depth Information, Free Articles, Nonlinear and Fiber Optics

I have included a handy guide to assist you in finding what you need.

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Last edited by photonaholic; 02-19-2010 at 02:29 AM.
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Old 02-19-2010, 02:27 AM #6
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Default Re: Can I change colours with this?

Quote:
Originally Posted by scopeguy20 View Post
I highly recommend a new user stay away from this, and any Infrared lasers! -Glenn
You mean infrared in particular because they cannot be seen?
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Old 02-19-2010, 02:29 AM #7
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Default Re: Can I change colours with this?

Thanks photonaholic I'll read a bit more before I post again
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Old 02-19-2010, 02:31 AM #8
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Default Re: Can I change colours with this?

don't worry so much about the posting, I'm just worried you'll get hurt.
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Old 02-19-2010, 02:33 AM #9
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Default Re: Can I change colours with this?

Quote:
Originally Posted by pinkpanda3310 View Post
You mean infrared in particular because they cannot be seen?
Yes, and also becuase higherpowered IR lasers can be bought for much cheaper than higher powered visible lasers, making them appealing to n00bs
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Old 02-19-2010, 02:36 AM #10
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Default Re: Can I change colours with this?

Quote:
Originally Posted by ZRTMWA View Post
Yes, and also becuase higherpowered IR lasers can be bought for much cheaper than higher powered visible lasers, making them appealing to n00bs

Sad state of affairs really... I can just easily imagine an uneducated person looking directly into it, wondering why the heck does this thing not seem to work.
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Old 02-19-2010, 02:38 AM #11
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Default Re: Can I change colours with this?

Quote:
Originally Posted by photonaholic View Post
don't worry so much about the posting, I'm just worried you'll get hurt.
I don't want to get hurt either that's why I'm here

Quote:
Originally Posted by ZRTMWA View Post
Yes, and also becuase higherpowered IR lasers can be bought for much cheaper than higher powered visible lasers, making them appealing to n00bs
That seems back to front then
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Old 02-19-2010, 02:47 AM #12
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Default Re: Can I change colours with this?

Actually, with 780 its a bit more dangerous. With 980 IR, there's some idea of the "threat" - you say to yourself (if you know) "This is an IR laser, I need to be careful when it's powered on - i can't see the beam."

.. The issue is, this is 780nm. It won't be invisible -- it'll look *HARMLESSLY DIM*. You'll see a DULL, FAINT red spot at 260mW/780nm. I've attached an image that gives an example of this, showing the 'relative apparent' brightness (mocked up, of course) from a 635nm 5mW pointer, a 650nm 5mW pointer, and a 780nm 200mW pointer.

I assure you, this 'innocent looking' dull red spot is NOT HARMLESS. The problem with "near IR" is that people will get lulled into a false sense of security seeing the 'dim, weak beam' - when actually it's likely enough to burn skin. They may even point it around at reflective surfaces.

Since you've ordered the laser - telling you that you 'did the wrong thing' isn't going to do as much as letting you know how to be safe around it. It'll be in your house, so it's good to be well equipped.

If you want to experiment with this -- (and I'm glad you came to this forum so people could warn you about this before the laser arrived!) -- get some IR blocking goggles. And get them now. And do not power on the laser until you have the goggles on.

While 780nm is not explicitly listed, these will work. (They list a few common wavelengths on the list. But they are OD3 at 780nm. I have the same ones, and I've tested them with my 780nm.) - (Think of 'OD' factor, Optical Density, as "SPF" for your eyes. Using EasyHaz, 780nm at 0.250w (250mW) - it shows you need an OD factor of 2.4 to be 'safe' from 1 second of exposure. Note, It also says that to be safe from a direct eye exposure to the beam, without goggles, with a divergence of 1.2mRad, you'd have to be 130 meters away! Dangerous stuff.)

808nm Infrared Laser Eyes Protection Glasses/Goggle

$35. If you OWN that laser, you should have those goggles. Period.


I'm not in any way an old timer here. I'm actually pretty new myself. But I've found a lot of useful knowledge here. So, I'd say - this isn't so much about admonishment. It's about safety. So its actually a very good thing that you came to this forum.
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Can I change colours with this?-red-ir-compare.png  
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3392nm:REO LHIP HeNe 2mW ∙ 980nm:OLIKE 155mW

808nm:OLIKE 200mW ∙ JETL PLC 600mW(682pk)
780nm:OLIKE 120mW
685nm:18650 47mW
671nm:PGL3M 281mW DPSS ∙ PGL3C 278mW
655nm:LOC 254mW ∙ OLIKE 221mW ∙ Yob 320mW
638nm:Sanyo 40mW ∙ HL63133 200mW ∙ PGL3C 463mWpk ∙ ML520 700mW
633nm:JDS1145 HeNe 28mW ∙ JDS1145 HeNe 26mW
612nm:MG 05LOR151 HeNe 3mW ∙ REO LSTP 3mW
609nm:REO LHOR 1mW
604nm:REO LSTP 2mW
594nm:Rigel 3mW ∙ LG PGL3C 15mWpk ∙ Lasos 7512 3mW ∙ CNI MGL3 58mWpk
589nm:CNI PGL3C 106mW ∙ CNI PGL3C 85mW
561nm:CNI PGL3C 30mW(41pk)
556nm:CNI PGL3C 20mW(22pk)
544nm:JDS1675P HeNe 2mW ∙ REO LHGR 2mW ∙ Lasos 7786 2mW
532nm:PGL3C 150mW(180pk) ∙ PGL3C 578mWpk ∙ PLC 440mWpk
515nm:JDS 221420GL ArI 30mW
510nm:52mW DG#2 ∙ 50mW 26650 DG
488nm:Nlx DPSS 7mW ∙ JDS 2214 ArI 40mW ∙ JDS FCD488 DPSS 25mW
ML:MG 65A106025 ArI ML 115mW
476/480nm:Nichia Diode 28mW
473nm:PGL3A 45mW(80pk) ∙ PGL3C 110mWpk ∙ PGL3C 95mWpk ∙ RPLB-25 60mWpk
465nm:DTR NDB7676 2.03w
458nm:JDS 2214VL ArI 8mW ∙ JDS 2214VL ArI 12mW ∙ RHD Diode 1.7W
452nm:Osram SM 47mW
445nm:Yob 1410mW ∙ Polaris 156mW ∙ PGL3C 1200mW ∙ DTR-EHG 32650 2136mW
405nm:Yob 630mW ∙ Qfox 750mW ∙ JETL PLC 780mW

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Old 02-19-2010, 03:05 AM #13
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Default Re: Can I change colours with this?

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This isn't about admonishment. It's about safety. So its actually a very good thing that you came to this forum.
excellent post!
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Old 02-19-2010, 03:45 AM #14
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Default Re: Can I change colours with this?

Thanks aryntha. I would look at palming this thing off now I understand where it's all gone wrong but I have bought it knowing it is dangerous mw for a noob. When it arrives I'll inspect the host and see if I can fit a new module. Glass's are #1 priority.

IR is quite a trap for noobs!
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Old 02-19-2010, 12:42 PM #15
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Default Do over

Alright guy's let's pretend I didn't purchase an unsuitable laser for a noob and am asking some questions now.

I first got interested from a youtube popping balloons etc... I have a look around for lasers and find some cheap yet powerful one's on ebay. I think 'hey if I get a really powerful one I can maybe cut some carbon fibre for my other hobby. I don't want to invest too much so I'll get this one that barely cuts 1mm. I reckon I can make it work with a different colour for coolness and show off to friends and upgrade it to cut up to 2-3mm. There is not much in this thread indicating the seriousness of the item in question (260mw 780nm) http://laserpointerforums.com/f36/lo...-me-47684.html Yes, I did read it beforehand. To add to that there is no calculator or link to easyhaz that helps to work out which goggles are needed, only the speculation you will need some.

I don't mean to whine and I much appreciate what you guy's have enlightened me to.

So what would you recomend for a noob? I'm not nesasarily going to go down this line but I may get a new module to fit the one coming. My prefferences would be something from the green to blue (or violet...just not red) side of the spectrum and can be upgraded easily. I also can't find a rule of thumb for 'at what power would goggles be nesasary', would they be needed even for the 5mw lasers? I don't intend looking down the barrel but I'm not a safety freak either.

I'm sorry if these answers are in the faq threads they are just not obvious to me.
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Old 02-19-2010, 12:51 PM #16
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Default Re: Can I change colours with this?

My first green laser was a cheap pointer I got for $12, I had a blast with it for weeks.

The green line through the air was impressive, the animals all loved chasing the spot around on the floor, and I ultimately wound up giving it to a friend who was twice as enthralled by it than I was.

Count on spending a small fortune if you really desire a "true blue" laser, they are rare and expensive. Blu Ray lasers are closer to UV and rather hard to see.

Personally I find burning things to be the least important aspect of lasers, yes it's cool, but not the most important.

a 5mw green pointer is an excellent place to start, and goggles are less important with one of those.
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