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Old 12-22-2011, 05:45 AM #1
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Default red 250 mw o-like help

recently I receved a 250 mw red o-like laser and from the day I got it in the mail the beam has had these weird circle. So my question is: is this normal?
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Old 12-22-2011, 05:49 AM #2
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Default Re: red 250 mw o-like help

Perfectly normal.

Did you also get a pair of safety goggles?
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Old 12-22-2011, 06:16 AM #3
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Default Re: red 250 mw o-like help

No i didn't, should I have?
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Old 12-22-2011, 06:22 AM #4
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Default Re: red 250 mw o-like help

yes just yes buy some now
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Old 12-22-2011, 06:32 AM #5
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Default Re: red 250 mw o-like help

thanks for the help
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Old 12-22-2011, 06:47 AM #6
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Default Re: red 250 mw o-like help

It may be out of focus. Do you know how to focus it ?

Jim
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Old 12-22-2011, 06:48 AM #7
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Default Re: red 250 mw o-like help

Quote:
Originally Posted by jimdt7 View Post
It may be out of focus. Do you know how to focus it ?

Jim
it is but he is referring to the artifacts/imperfections im quite sure
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Old 12-22-2011, 02:53 PM #8
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Default Re: red 250 mw o-like help

yes I was referring to the imperfections not that the laser is not focused.
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Old 12-25-2011, 10:34 PM #9
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Default Re: red 250 mw o-like help

Those round circles present in the beam are the result of diffraction around a dust particle or something silimar. The diode's window or collimating lens is slightly dirty. The most likely case is a dust spec on the output end of the lens. Cleaning a lens however is that straighforward, be careful and do some reading.
Arago spot - Wikipedia, the free encyclopedia
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Old 12-26-2011, 01:25 AM #10
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Default Re: red 250 mw o-like help

The lens dose the have a bit of dust on it so I'll look into how to clean it without damaging it.
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Old 12-26-2011, 08:45 AM #11
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Default Re: red 250 mw o-like help

But remember to get the goggles first so that you can do it without fear of blinding yourself accidentally. It also makes it a lot easier to analyze the beam pattern.
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Old 12-26-2011, 02:47 PM #12
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Default Re: red 250 mw o-like help

Im borrowing a friends extra pair for a while since things take like 10-20 days to get here form 0-like.
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