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Old 03-26-2008, 12:14 AM #1
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Default ir help

ok i just sold my dx 30 mw green and the person wonted me to make it an ir i have the crystal out but its not a burner, do i need to colminate it more, if so how do i do it?


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Old 03-26-2008, 03:03 AM #2
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Default Re: ir help

You should try to focus it so that it makes a tiny spot a few inches away.If that won't burn, then you're out of luck.
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Old 03-26-2008, 07:56 AM #3
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Default Re: ir help

Your (green) optics are well suited for collimating a green laser, but not for collimating the output from the IR pump once you remove the crystal.

My understanding:

If the laser had separate expander and collimating lenses, they would have to relocated closer to the IR diode to collimate it. If the laser had only a collimating lens, that lens won't work for the IR.

Good luck!
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Old 03-26-2008, 10:42 PM #4
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Default Re: ir help

so how do i colminate an ir laser?
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Old 03-26-2008, 11:05 PM #5
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Default Re: ir help

A lens from an aixiz module should do the trick.
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Old 03-26-2008, 11:14 PM #6
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Default Re: ir help

Quote:
Originally Posted by glona
Ok, I just sold my DX 30 mW green, and the person wanted me to make it into an IR laser. I have the crystal out but its not a burner, do I need to collimate it more, and if so, how do I do it?
For fuck's sake, take more than 12 seconds to type your post and proof read some shit.
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Old 03-27-2008, 05:59 PM #7
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Default Re: ir help

Quote:
Originally Posted by glona
so how do i colminate an ir laser?
It really depends on whether it's a single mode diode. Only on a single mode diode is it easily possible (using minimal optics) to get a good tight spot. That's why burner diodes make good pointers, cuz a diode used for disc pickup needs to be single mode to be focused well. Many pump diodes have terrible beam specs (multimode diode), simply because it doesn't matter (and in some cases is an advantage) - it's only going to be used to 'pump' an xtal.

Short answer, you may need more complicated optics than it's worth to get a good beam
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Old 03-27-2008, 07:23 PM #8
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Default Re: ir help

I hacked a green laser about a month ago, and posted here for help. What I've learned here and from other boards is echoed by flogged in the post above this one.

IR pumps for green lasers are multi-mode, and aren't really meant to be collimated.

Single-lens collimated IR lasers are commonly available. They start with a single-mode laser diode.

That said, many green lasers have three lenses:
1 - a crude collimator between the diode and the crystal
2 - an expander lens after the crystal
3 - a collimating lens at the tip.

The expander lens was catching the green output from the crystal, and making a relatively uniform green beam to the collimator.

If the expander lens is a small-orifice type, and if you can relocate it closer to the ir pump diode (like about where the crystal used to be), then it will still perform it's basic function, which is to convert a rough beam to something more usable for the collimator. The small orifice will block some of the beam. The lens will expand the rest onto whatever is in front of it.

Remove the green collimator, and replace it with a collimator from an IR module, and you may have something.

Aixiz sells a 980nm IR module for $12. It has a removable (threaded) acrylic collimating lens that will work for IR. I also bought a $2 glass collimator from them, and it was also capable of collimating the output from the IR module.

Good luck!
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