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Old 08-15-2011, 05:00 PM #1
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Question 1W IR weird focus.

I just built a 1W 808nm IR laser. It works really well and burns nicely but only at about 5cm. No matter what distance I put the lens at it's focused only to one point.
I tried 3 different lenses that I had but they all do the same thing. I've built a green, red and violet laser before this one and didn't have a problem with them.
Any Ideas? Am I missing some info on IRs?

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Old 08-15-2011, 05:33 PM #2
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Default Re: 1W IR weird focus.

Safty glasses!! 1w of ir is DANGER get them if you don't already have them.
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Old 08-15-2011, 06:13 PM #3
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Default Re: 1W IR weird focus.

Yea I have safety goggles for most of the wavelengths.
Any ideas concerning the topic?
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Old 08-15-2011, 07:12 PM #4
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Default Re: 1W IR weird focus.

what type of module/lens are you using?
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Old 08-15-2011, 07:26 PM #5
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Default Re: 1W IR weird focus.

I belive most 1 watt IR lasers are multimode with very crappy divergence and beam specs. You'll Need good optics if you want to make it a distance burner. Also bear in mind IR is not the best WL for burning so once it losses even a little power it can make it hard to burn.
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Old 08-15-2011, 08:37 PM #6
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Default Re: 1W IR weird focus.

I have it in a module like this o-like one:
9mm diode housing w/glass lens for red laser or 808nm | eBay

I tried using the lens it came with and this lens:
660nm/808nm Glass Collimating Lens/M9P0.5 Metal Frame | eBay

The problem it not that it doesn't burn at a distance but that it doesn't focus farther or closer than a certain point away from the lens.
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Old 08-15-2011, 08:43 PM #7
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Default Re: 1W IR weird focus.

Also, I'm using a driver that specs for 100-500mw diode. It will just keep the diode from going full power right? Would it have any other affect on the diode?
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Old 08-16-2011, 12:44 AM #8
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Default Re: 1W IR weird focus.

That driver is just giving a minimal amount of current, is all.

Regarding your focusing issue... that's interesting. Have you isolated the diode itself and tried putting a lens closer and further from it, to see what's going on?
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Old 08-16-2011, 12:57 AM #9
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Default Re: 1W IR weird focus.

IRs often become focused into a line, or a dash. not a dot.
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Old 08-16-2011, 09:40 AM #10
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Default Re: 1W IR weird focus.

My overspec 500mW 808nm IR laser (peaks at 630mW) burns a match only up to 30cm well focused.

I posted a question here asking whether I will be able to burn a match much further than 30cm if I buy a more powerful 2W Focusable NIR Infra Red Laser?
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Old 08-16-2011, 06:51 PM #11
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Default Re: 1W IR weird focus.

Yes, I've put the lens closer and farther away from the diode and it only focuses a few cm away from the lens regarding the distance the lens is from the diode.

I have a 300mw IR but I replaced it with the 1W cuz the 300mw was to weak. I'll try powering up my 300mw IR when I get the chance and see if i can focus it past a few cm.
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Old 08-18-2011, 05:48 PM #12
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Default Re: 1W IR weird focus.

So I tried the 300mw IR and it focuses fine. That means the diode is just really weird I guess.
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Old 08-22-2011, 05:53 PM #13
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Default Re: 1W IR weird focus.

The 1000mW IR diode is a multimode diode and therefore focusing as a line like Fenzir said. The 300mW diode is a singlemode diode and therefore focusing as a dot, so you 1000mW diode isnīt weird. Itīs the nature of a multimode diode. To get it focused to a dot you need correction optics.
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Old 08-24-2011, 08:00 PM #14
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Default Re: 1W IR weird focus.

Ok, so any help with the kind of lens or whatever optics I need to focus it?
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Old 08-25-2011, 09:39 PM #15
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Default Re: 1W IR weird focus.

You will need either two prisms to correct it, or a special lens that is a hybride between a lens and a prism. You can get such correction optics for blue Laserdiodes, but donīt know how good they will perform with IR laserdiodes.

There are also cylindrical lenses that can do the trick.

Last edited by honeyx; 08-25-2011 at 09:42 PM.
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Old 08-26-2011, 12:37 AM #16
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Default Re: 1W IR weird focus.

Do you have any suggestions for prisms or lenses?
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