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Thread: 2W Laser Moving Head Enclosure

  1. #21
    Join Date
    Feb 2008
    Posts
    47

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    There is one thing I have noticed.
    The mirror I use to bounce the beam from the laser to the galvos is making the beem wider, its like two dots next to eachother.
    That makes the dot bigger than the galvo mirror and causes some light leekage.
    This is a very cheap mirror I just pulled from a broken mirror I had.
    Do I need a special type mirror to get the nice round dot that the laser creates?

  2. #22
    Join Date
    Nov 2007
    Location
    Sydney, Australia
    Posts
    600

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    Atlewee

    Great job on the laser build, looks great (and congrats on the engagement)

    I assume that when you refer to the cheap mirrow that is just household bathroom mirror?

    This type of mirror will create two dots, one from the mirror substrate on the back of the glass and one from the front surface of the glass.

    You'll need to get a dichroic mirror (as used on the scanners) or the cheaper front surfaced mirrors
    RTI Piko RGB 4 Projector
    CT6215 Scanners & CT 671 Amps; CT6210 & Medialas Microamps. GS124PD
    RGBLaser Systems 6000mW RGB Module - 638nm/445nm/532
    LD2000 Pro + QM2000.net + Beyond
    Etherdream + LSX

    Old Projector Build


  3. #23
    Join Date
    Jan 2008
    Location
    Stockholm, Sweden
    Posts
    799

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    Very nice work there and congratulations on the engagement!

    Are you using a front side mirror? If not the larger beam might be explained by internal reflection in the mirror. It could also be slightly curved reflective surface.

    It would be best to use a dichroic mirror optimized for 532nm and 45°. The same type that is used to combine beams of different colors can be used for this. They have much lower losses than normal mirrors.

  4. #24
    Join Date
    Jan 2008
    Location
    Bonnie Scotland
    Posts
    69

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    HI

    Superb work with your moving head laser !

    What you need is a front coated mirror the same as the galvo`s use.
    2 WATT DPSS RGB

  5. #25
    Join Date
    Feb 2008
    Posts
    47

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    Thankyou all for your reply.
    I will have to look for a new mirror =)
    That will probably give me even more light output from the laser.
    Less dangerous leekage beems.

  6. #26
    Join Date
    Aug 2007
    Location
    Portland
    Posts
    1,354

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    I think this is one of the coolest projects I've seen in a bit.

    Good job on all of the engineering. You should make another one so you can have two working together in visual stereo.

  7. #27
    Join Date
    Apr 2008
    Location
    Indiana
    Posts
    92

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    Quote Originally Posted by Atlewee View Post

    We also did some more laser on the sky last night..
    Skylaser.wmv (20,9MB)

    That's awesome. Was it foggy out? The air is completely full of particulate? Or is that rain?
    Fear Fair - Indiana's Scariest Haunted House
    www.FearFair.com

  8. #28
    Join Date
    Mar 2007
    Location
    Rotorua New Zealand
    Posts
    528

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    Congratulations on both....

    Now you have two money pit hobbies...

    Ray
    NZ

  9. #29
    Join Date
    Feb 2008
    Posts
    47

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    Quote Originally Posted by fearfair View Post
    That's awesome. Was it foggy out? The air is completely full of particulate? Or is that rain?
    There was no fog, but it was raining alot! so all the particles in the air is raindrops.

  10. #30
    Join Date
    May 2008
    Location
    Kent, UK
    Posts
    212

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    Congrats on your engagement.

    Thank you for sharing your project with us all.
    I found the whole thing most interesting and I am sure your hard work, pictures and details will encourage others to have ago at something similar.

    So well done and thank you.

    André

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