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Old 12-01-2015, 04:27 PM #1
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Default Question on 405nm beam

Just got a few new lasers, I'm still waiting for my LPM materials to get here to get them measured, but when looking at the 75mW 405nm laser focus all the way out, I noticed some spots in the beam. Are these normal? I haven't checked my other lasers, but will.
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Old 12-01-2015, 04:36 PM #2
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Default Re: Question on 405nm beam

Yes this is normal, I have several lasers with this, it is a tiny flaw in the emitter or more likely the glass window in the diode can, or tiny particles on the glass, I don't recommend trying to clean the glass window in the diode, sometimes this goes badly, keep the lens on all the time so no dust gets on the diode window.

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Old 12-01-2015, 04:37 PM #3
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Default Re: Question on 405nm beam

Looks like it may be dirt on the lens, do the dots move when you rotate the focus adjuster, if so then the contamination is on the lens.
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Old 12-01-2015, 04:40 PM #4
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Default Re: Question on 405nm beam

Hi,
Could be something simple links,a dirty lens or diode window. That happened to me a couple,of times to. A little alcohol on a swab not to much let it dry then use air for computer keyboards. This is to make sure you don't have any lint from the swab on on the diode window . If you do it will burn onto the window you don't want that. Hope it helps a little

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Old 12-01-2015, 04:53 PM #5
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Default Re: Question on 405nm beam

I wouldn't clean the diode window over something that small, I have larger dots in my best laser but you can only see them when it's unfocused so it doesn't matter, and mine don't rotate with the lens, that means the diode, if it's not broke don't fix it, it's too easy to make it worse, however Bowtie is right, see if they rotate when focusing. I keep a lens cap on my lasers because I live in a dusty environment and it's easy to ruin a lens by burning someting on to it so it can't be cleaned, although this generally applies mostly to more powerful lasers.

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Old 12-01-2015, 05:04 PM #6
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Default Re: Question on 405nm beam

That's actually pretty clean looking; I've seen a lot worse than that, heck I own a lot worse than that!
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Old 12-01-2015, 05:30 PM #7
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Default Re: Question on 405nm beam

Quote:
Originally Posted by Pi R Squared View Post
Yes this is normal, I have several lasers with this, it is a tiny flaw in the emitter or more likely the glass window in the diode can, or tiny particles on the glass, I don't recommend trying to clean the glass window in the diode, sometimes this goes badly, keep the lens on all the time so no dust gets on the diode window.

Alan
Aha! Thank you for the info.
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Old 12-01-2015, 05:31 PM #8
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Default Re: Question on 405nm beam

Quote:
Originally Posted by BowtieGuy View Post
Looks like it may be dirt on the lens, do the dots move when you rotate the focus adjuster, if so then the contamination is on the lens.
Haven't checked when rotating the adjuster, will do that tonight.
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Old 12-01-2015, 05:33 PM #9
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Default Re: Question on 405nm beam

Quote:
Originally Posted by BowtieGuy View Post
That's actually pretty clean looking; I've seen a lot worse than that, heck I own a lot worse than that!
Well, I haven't checked any of my new lasers yet, so I might see a lot worse I only checked this one because the dot looked really weird with this laser. From about 10' it looks like it has a central focused dot, with two tiny dots on the right and left. I tried to take a pic, but wasn't successful. Have to figure out how to take good laser pics.
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Old 12-01-2015, 05:34 PM #10
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Default Re: Question on 405nm beam

Quote:
Originally Posted by Pi R Squared View Post
I wouldn't clean the diode window over something that small, I have larger dots in my best laser but you can only see them when it's unfocused so it doesn't matter, and mine don't rotate with the lens, that means the diode, if it's not broke don't fix it, it's too easy to make it worse, however Bowtie is right, see if they rotate when focusing. I keep a lens cap on my lasers because I live in a dusty environment and it's easy to ruin a lens by burning someting on to it so it can't be cleaned, although this generally applies mostly to more powerful lasers.

Alan
Although I won't bother with the cheaper lasers, I think I'll try to find a lens cap for the three more expensive ones. Yes, $30 to me is expensive
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Old 12-01-2015, 05:34 PM #11
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Default Re: Question on 405nm beam

Quote:
Originally Posted by Lifetime17 View Post
Hi,
Could be something simple links,a dirty lens or diode window. That happened to me a couple,of times to. A little alcohol on a swab not to much let it dry then use air for computer keyboards. This is to make sure you don't have any lint from the swab on on the diode window . If you do it will burn onto the window you don't want that. Hope it helps a little

Rich
Thanks for the info!
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5mw 650nm SDLaser 301 (??mW)
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Old 12-01-2015, 05:40 PM #12
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Default Re: Question on 405nm beam

Jeez man, are you going for the record? 5 posts in a row!

You should use the multiquote button to quote multiple people or edit your latest response.
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Old 12-01-2015, 05:47 PM #13
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Default Re: Question on 405nm beam

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Jeez man, are you going for the record? 5 posts in a row!

You should use the multiquote button to quote multiple people or edit your latest response.
Good idea! Sorry about that
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Old 12-01-2015, 05:52 PM #14
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Default Re: Question on 405nm beam

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Originally Posted by gregma View Post
Good idea! Sorry about that

It's all good
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Old 12-01-2015, 07:43 PM #15
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Default Re: Question on 405nm beam

Quote:
Originally Posted by gregma View Post
Well, I haven't checked any of my new lasers yet, so I might see a lot worse I only checked this one because the dot looked really weird with this laser. From about 10' it looks like it has a central focused dot, with two tiny dots on the right and left. I tried to take a pic, but wasn't successful. Have to figure out how to take good laser pics.
That's normal for a 405nm dot, it will look like that.
It's the way the light waves interfere with each other.

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Old 12-01-2015, 07:48 PM #16
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Default Re: Question on 405nm beam

Quote:
Originally Posted by RB astro View Post
That's normal for a 405nm dot, it will look like that.
It's the way the light waves interfere with each other.

Good to know, thank you! I thought perhaps it was defective, but so far everything I've gotten from him has been outstanding quality.
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