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Old 09-06-2012, 10:07 AM #1
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Default Beam and dot problem: Beam expands, dot is as big as my hand after 30

Hi

I have just put my laser together, and I saw this problem
I am using M140 diode and G-2.


After 30 cm from the laser, the beam expand, and the dot gets very very big and the laser doesn't even pop a balloon or light a match.

I am sure that the lens is not upside down.


Here is what happens when I focus it, first a big square, then it gets smaller ,then it becomes dot surrounded by blue light, looks like a line but wider, when I focus it more it turns to a big circle and it gets bigger when I focus it more.



What is wrong with it ??



Last edited by hoo7h; 09-06-2012 at 10:35 AM.
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Old 09-06-2012, 10:26 AM #2
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

It looks not a problem to me. You need to focus the dot for popping balloons. With focussing I mean to the smallest dot.
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Old 09-06-2012, 10:33 AM #3
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

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Originally Posted by Blord View Post
It looks not a problem to me. You need to focus the dot for popping balloons. With focussing I mean to the smallest dot.
I don't get a small dot except after 5 cm from the laser, anything more there is no focused dot, and the beam expand too.
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Old 09-06-2012, 10:37 AM #4
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Did you press the diode enough into the module ? The G2 lens must sit very close to the diode or else you won't reach focus with it.
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Old 09-06-2012, 10:39 AM #5
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

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Did you press the diode enough into the module ? The G2 lens must sit very close to the diode or else you won't reach focus with it.
I bought it with its module pressed already

Last edited by hoo7h; 09-06-2012 at 10:39 AM.
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Old 09-06-2012, 10:42 AM #6
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Can you take pictures of the lens and the RAW output of the diode without lens ?
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Old 09-06-2012, 11:05 AM #7
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Here is how the lens look like




This is the diode

There is some shiny metal thing beside the center

Here is a beamshot with the lens focused (best focus I saw)

It doesn't really looks like a round circle but this is what my iphone gets, it looks like a wide line with a dot in the middle, look at the beam expand, this is not from the camera it does expand like this


The is how it looks without the lens

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Old 09-06-2012, 11:21 AM #8
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Your RAW output looks very different. It should look like this,

I am afraid your diode has turned into a LED.
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Old 09-06-2012, 11:28 AM #9
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Quote:
Originally Posted by Blord View Post
Your RAW output looks very different. It should look like this,

I am afraid your diode has turned into a LED.
Oh shit what do you mean by turning to a LED ?
Am I screwed ?
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Old 09-06-2012, 11:42 AM #10
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

LED mean light emitting diode. It doesn't emit laser light anymore, just ordinary light.
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Old 09-06-2012, 11:45 AM #11
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

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LED mean light emitting diode. It doesn't emit laser light anymore, just ordinary light.
Why does that happen ?, is it because of any mistakes by me ?, do I send it back to the seller ?
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Old 09-06-2012, 12:16 PM #12
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Hey Blord are you sure? He still has a narrow collimated beam of light coming out of his laser. If it had LEDed wouldnt it be like a weak LED ie without a stong beam that you can easily photograph?

Maybe he has some dirt or debris on the diode window? Have you also tried turning the lens around? FYI it should be set up like this to work, with the optic close to the diode.

Edit: Does it still burn when focused to a small point close to the laser and does it appear nearly as bright, visually, as it did before? You could test this at night (outdoors) and compare the beam with what you remember. It wont give you any idea of power but it should help you discern whether it has LEDed.

Edit 2: I think I saw something like this before, when someone damaged the diode window. I think they actually burnt or partly melted it...? Ill try to find it.
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Old 09-06-2012, 12:25 PM #13
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Quote:
Originally Posted by grainde View Post
Hey Blord are you sure? He still has a narrow collimated beam of light coming out of his laser. If it had LEDed wouldnt it be like a weak LED ie without a stong beam that you can easily photograph?

Maybe he has some dirt or debris on the diode window? Have you also tried turning the lens around? FYI it should be set up like this to work, with the optic close to the diode.

Edit: Does it still burn when focused to a small point close to the laser and does it appear nearly as bright, visually, as it did before? You could test this at night (outdoors) and compare the beam with what you remember. It wont give you any idea of power but it should help you discern whether it has LEDed.

Yes it does burn black stuff very fast, and it burns white paper after few second, but from a close distant, 1-10 cm
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Old 09-06-2012, 02:05 PM #14
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

It could be dirt on the diode window. You need to clean it.
If it doesn't work then the diode must be decanned. That will be a hard job because the diode is already in the module.
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Old 09-06-2012, 02:23 PM #15
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Quote:
Originally Posted by hoo7h View Post
This is the diode

There is some shiny metal thing beside the center
I think this is where the problem lies. Usually the window has an even coating, with sometimes a tiny "burn" mark where the beam passes through. Does your diode have this window with the gold-ish (I think it's goldish, right, folks?) coating?
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Old 09-06-2012, 06:20 PM #16
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Default Re: Beam and dot problem: Beam expands, dot is as big as my hand after 30

Heres the link I mentioned.
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