Old 09-28-2011, 07:39 PM #1
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Default Why dosn't my laser burn?

Hello all! I'm new here and this is my first post.

Anyway here are my specs, LPC815 diode running on a DDL driver with aixiz module. My resistors are 10ohm running @ 125ma. I'm powering it off 6v of AA'a.
It is bright and the beam can be seen in the dark but no heat! I think my resistors are setting the ma too low? What do you guys think?


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Old 09-28-2011, 07:58 PM #2
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Default Re: Why dosn't my laser burn?

Me think if your laser don't burn he doesn't output enough energy...
Maybe you should look at the specsheet and adjust your driver...
Here you go: http://laserpointerforums.com/f50/lo...eet-47665.html

Btw.: Welcome to LPF...it would be nice to see a post in the welcome section
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Old 09-28-2011, 08:13 PM #3
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Default Re: Why dosn't my laser burn?

Yeah, I think you're going to need more amperage to the diode.

Are you using a pot along with 2x10ohm resistors?
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Old 09-28-2011, 08:15 PM #4
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Default Re: Why dosn't my laser burn?

Yea, 25ohm pot with 2x 10ohm resistors
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Old 09-28-2011, 08:20 PM #5
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Default Re: Why dosn't my laser burn?

tune your driver to >200mA and it will burn...but YOU MUST USE GOGGLES WHILE BURNING! i hope you know that already?
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Old 09-28-2011, 08:22 PM #6
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Default Re: Why dosn't my laser burn?

n00b question...how do I tune it? I dont have a multimeter
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Old 09-28-2011, 08:27 PM #7
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Default Re: Why dosn't my laser burn?

how do you know that it is at 100mA at the moment?
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Old 09-28-2011, 08:33 PM #8
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Default Re: Why dosn't my laser burn?

I borrowed my friends meter...
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Old 09-28-2011, 08:38 PM #9
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Default Re: Why dosn't my laser burn?

You have to build a dummy load and attach the driver...then use a multimeter (get one) and adjust the pot...that's it.
If you don't know how to do that or what i talk about then this is the best moment to try our well known forum search..it is very reliable and convenient to use
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Old 09-28-2011, 08:41 PM #10
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Default Re: Why dosn't my laser burn?

I have also diode from 16x dvd burner and I set 228mA to the diode and it still isn't burning, when I focus it on match, it just gets hot, but don't ignite
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Old 09-28-2011, 08:46 PM #11
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Default Re: Why dosn't my laser burn?

Maybe your focusing lens is drawing to much power!?
Or maybe you need a tripod...or just another laser
I have some low power lasers and one high-power blue...and i didn't even try to burn with the lower powered ones
I tried to get yellow by combining red and green, but with no success...needs alot aligning..0o
If you wannaburn PM wannaburn and get some lasers from him...*hehe*
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Old 09-28-2011, 09:57 PM #12
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Default Re: Why dosn't my laser burn?

I don't think so, it's just a regular focusing lens from DX, a lot of people here use it. Red Laser Module - Focusable Dot (3.5V~4.5V 16mm 5mW) - Free Shipping - DealExtreme - this one
And maybe you are right, I need a tripod, but it should burn also when I 'm just holdin' it and focusin' on a match or sth ..
Anyway I will try to set 250mA in few days in see what it can do
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Old 09-28-2011, 10:31 PM #13
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Default Re: Why dosn't my laser burn?

The LPC 815 diode is normally fed >400mA.
420mA is a good current for ~250mW with a good lens.

Also, in order to burn stuff, the stuff needs to absorb the light. That means dark colors.
If the match tip is red, color it black with a marker and try again.

Edit: Check this graph for an estimate of the output of your laser at a given current:
http://images.wikia.com/lasers/image...ed_roundup.PNG

The diode in the LPC sled is a "long die open can."
228mA should give you less than 150mW of output power.
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Old 09-28-2011, 11:02 PM #14
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Default Re: Why dosn't my laser burn?

To keep things simple, dont use a pot. Just use one 3 Ohm res or 2x 6 Ohms res in parallel. That Will give you around 420mA. Dont run your laser more than 20 sec at a time. Let ir cool for 15 sec or so. Heatsinking the module is recommended.
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Old 09-29-2011, 02:39 AM #15
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Default Re: Why dosn't my laser burn?

Mybad, it was a focus issue...I got it burning. Although I think I should use 4-6ohm resistors cuz it's a bit underpowered.
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