Old 07-05-2016, 11:49 AM #1
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Question Lines in defocused spot?

Hi,
yesterday evening I noticed some strange lines in the spot of my 2W 445nm laser when it is not focused. I wondered if this is normal, because I never noticed it before?

Here some pictures.

Lines in defocused spot?-tmp1.jpg

Lines in defocused spot?-tmp2.jpg

Lines in defocused spot?-tmp3.jpg



Last edited by momo1717; 07-05-2016 at 11:52 AM.
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Old 07-05-2016, 11:54 AM #2
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Default Re: Lines in defocused spot?

It is a multimode laser, so there other lines of intensity within the diode.

By defocusing, you are decombining them. This allows you to see the individual peaks. I hope this helps.
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Old 07-05-2016, 12:04 PM #3
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Default Re: Lines in defocused spot?

Quote:
Originally Posted by CurtisOliver View Post
It is a multimode laser, so there other lines of intensity within the diode.

By defocusing, you are decombining them. This allows you to see the individual peaks. I hope this helps.
Oh OK, thanks for clarifying this!
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Old 07-05-2016, 12:07 PM #4
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Default Re: Lines in defocused spot?

No problem This is an image of a multimode red from Misterwilling from the forum.

You can see those peaks again, only your images show it more profoundly.
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Old 07-05-2016, 12:54 PM #5
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Default Re: Lines in defocused spot?

Quote:
Originally Posted by momo1717 View Post
Hi,
yesterday evening I noticed some strange lines in the spot of my 2W 445nm laser when it is not focused. I wondered if this is normal, because I never noticed it before?
Your diode and lens are VERY clean, you will also notice some "dots" in the pattern when unfocused also, these will come from dirt and dust on the lens or diode window. Its hard not to get a few at some point.
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Old 07-05-2016, 05:05 PM #6
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Default Re: Lines in defocused spot?

Quote:
Originally Posted by CurtisOliver View Post
No problem This is an image of a multimode red from Misterwilling from the forum.

You can see those peaks again, only your images show it more profoundly.
So does that also mean that those "lines" have some nanometer difference, for example the one on top and the one on the bottom in comparison to the middle one?
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Old 07-05-2016, 05:10 PM #7
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Default Re: Lines in defocused spot?

Yes, ever so slightly. The wavelength difference isn't perceivable.

This is one of the reasons single mode diodes are preferable for certain applications.
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Old 07-05-2016, 05:19 PM #8
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Default Re: Lines in defocused spot?

Quote:
Originally Posted by CurtisOliver View Post
Yes, ever so slightly. The wavelength difference isn't perceivable.

This is one of the reasons single mode diodes are preferable for certain applications.
I understand. And what is with those cheep green ebay laser pointers. Are the they single mode, because they have no lines at all?
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Old 07-05-2016, 05:20 PM #9
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Default Re: Lines in defocused spot?

Quote:
Originally Posted by icecruncher View Post
Your diode and lens are VERY clean, you will also notice some "dots" in the pattern when unfocused also, these will come from dirt and dust on the lens or diode window. Its hard not to get a few at some point.
Thank you
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Old 07-05-2016, 05:36 PM #10
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Default Re: Lines in defocused spot?

They are DPSS lasers. The pump diode is multimode, but in some cases the 1064nm output can be single mode leading to single mode 532nm.
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Old 07-05-2016, 05:55 PM #11
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Default Re: Lines in defocused spot?

A lot of people here are saying the lines are okay, I must disagree. Yes, lines in a multimode diode are normal, but those lines do not look good. That often happens with a damaged diode. When you have lines of differing strength that's normal, but when there are lines with no output the diode may be close to death.
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Old 07-05-2016, 06:06 PM #12
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Default Re: Lines in defocused spot?

Does the laser operate ok when collimated Momo1717? This is something I forgot to ask Sta. If the laser is behaving normally it may rule out any issues.
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Old 07-05-2016, 09:10 PM #13
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Default Re: Lines in defocused spot?

Quote:
Originally Posted by CurtisOliver View Post
Does the laser operate ok when collimated Momo1717? This is something I forgot to ask Sta. If the laser is behaving normally it may rule out any issues.
Yeah, it's difficult to tell. I get a nice spot on the first 10-20m when collimated (I have the three element glass for aixiz module)
I have this 2W M140 module now 3 weeks and I noticed (at least I think this) that it has lost somehow a little of its power. When I got the module, one could really feel the heat on the hand even if the spot was very large. Now it seems that it has lost some of its power... (maybe this is just an illusion, I don't know) But I never noticed those lines before...
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Old 07-05-2016, 09:17 PM #14
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Default Re: Lines in defocused spot?

My 1 watt 445 does have lines, but they are very faint compared to that. The output of mine is pretty evenly spread, those lines are very extreme and very different in brightness. Looks like i need to clean my lens though.
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Old 07-05-2016, 09:23 PM #15
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Default Re: Lines in defocused spot?

I'm afraid I might have to agree with Sta. At first glance I thought it was multimode lines, but the laser doesn't sound healthy. Might have to get another m140.
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Old 07-05-2016, 09:41 PM #16
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Default Re: Lines in defocused spot?

It doesn't look terrible in the first picture, but certainly worse in the last two. I imagine you had it focused differently between images.

It's possible that the diode is damaged/defective. That doesn't mean it'll die any time soon though. It may work fine for ages - just with lower output/efficiency.

DTR has talked about the issue in the past - as have others:

Quote:
Originally Posted by DTR View Post
It is definitely damaged. I have seen damage like this and I bet if you varied the current different lines would light up and go out. You could try different currents and find the current that makes the most uniform pattern. I made a really nice 200mW pen build with a diode that was damaged like this and it ended up having very good divergence. If you have a bench supply you can slowly turn the current up and you will see different lines turning on and off. If you can find a level where it is the most centered and filled out that would be where you could run it for best performance. As for what causes this damage I am not sure but my guess would be a spike or something causing damage to the mirrors in the lasing cavity but not to an extent the diode goes full LED.

Full thread: http://laserpointerforums.com/f65/su...ml#post1234836
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Last edited by diachi; 07-05-2016 at 09:43 PM.
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