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Thread: Blue beam quality

  1. #1
    Join Date
    Dec 2006
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    Netherlands
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    964

    Default Blue beam quality

    This week I received a new >50 mW dpss laser. Great toy but the beam really is TEM01 with a weak and strong side.
    The laser looks like the CNI model and probably is but it is resold by a German seller, in my case through ebay.
    I paid for "excellente strahlqualiteit, stabilitat and divergenz" (excellent beam quality etc.) and of course prefer a near round beam.

    Some pics of the actual spot are here .

    How bad is this? Is it acceptable for a blue or not?

    Your judgement is much appreciated.
    Last edited by Zoof; 02-05-2008 at 05:41. Reason: url changed

  2. #2
    Join Date
    Oct 2006
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    Central Florida
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    Default

    Eh... How far away, or how long a beam is that? I'm not the expert but I wouldn't be happy with that. I have to leave for work in a few minutes but when I get home I'll do a 20 foot spot shot with my >50mW blue CNI and compare.
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  3. #3
    Join Date
    Apr 2006
    Location
    Caracas, Venezuela
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    Default

    That beam looks very much like the mandelbrot figure :roll: . Not very good.
    Remember the future?, That'd today, as you imagined it yesterday.

  4. Default

    The TEM00 spot looks like this.


    David

  5. #5
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    Default

    Here's what mine looks like from about 25 feet...







    The second one is a real close up and the third has a tape measure under it but you can't see the numbers... It's about a quarter to half inch spot, well I think, I had my goggles on and can't wear my glassed with them. ops:

  6. #6
    Join Date
    Dec 2006
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    Netherlands
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    Default

    Thanks for the comparison.
    It is discouraging since this is already a replacement laser because the first one died in 10 minutes .....
    The seller has offered to refund my money but what I really want is a good quality laser .....

    What is the experience with postal services? Does much damage occur to lasers such as misalignment due to rough handling or thermal stress?
    Last edited by Zoof; 02-05-2008 at 05:42.

  7. #7
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    Dec 2006
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    Default

    BTW, should this type (CNI?) of laser have a IR filter at the output aperture as the final optical element?

    M.

  8. #8
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    Mine does. It's glued right on the aperture. You can see it when you unscrew the end.

  9. #9
    Join Date
    Aug 2006
    Location
    North West England
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    Default

    They should but when mine came it didn't, Liu from CNI sent me one straight away, it arrived in a couple of days.
    However when I installed the filter the o/p dropped to 38mW. They are refunding me part of the money but I havent recieved the refund yet and its 2 weeks .

    Jim

  10. #10
    Join Date
    Jan 2007
    Location
    Peking
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    1,199

    Default

    Some pics of the actual spot are here .
    The pics is really bad, look like with two beams,not TEM01

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