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Thread: risley prisms anyone?

  1. #1
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    Default risley prisms anyone?

    Where can you buy some risley/wedge prisms? Need to steer a beam and seems a better option that galvos as the beam is wide (30mm) and speed requirements are low. Can attach a gear ring around each and rotate them with stepper motors.
    Only saw one listing on eBay and Thor/Edmund are as always top quality but expensive.
    This is for experimenting for now, no real-world usage.

  2. #2
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    Why not just use a mirror?

  3. #3
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    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    Any optical wedge is a crude Risley. I think you'll have a harder time finding cheap big wedges with proper coatings then bigger galvos.

    Steve

  4. #4
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    I'm sorry for not providing enough information in my initial post.

    We need about 75% light transmittance and the power is quite low so no risk of damage for acrylic material rather than glass.
    But the size of the system is preferred to be kept small.
    The beam angle is quite high and is already 30mm when it reaches the first lens or mirror, so the system will get pretty big with rotating mirrors of appropriate size.
    Another issue is we need to change the offset of the beam in two axis before reaching a final large lens, but not its angle which has to stay perpendicular to the lens, I'm not sure with mirrors we can achieve this requirements (and also keep it relatively small).
    Sorry for not being clear up front.
    Last edited by widaxi; 02-03-2018 at 03:18. Reason: typo

  5. #5
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    Oh, just use a glass rod. Tilt the rod to produce the beam offset.
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  6. #6
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    I have 1 Degree Risley prisms. They are new and individually packaged. Fused Silica, 25mm diam. 4.7mm thick. P/N 3737-0023 from Meller Optics. No info on coating.

    $15 ea. + $8 priority mail shipping to the US.

    Please PM me if you can use any.

  7. #7
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    Would these be the same as the prisms we use for beam correction? Never heard of them before so figured might as well learn. They look similar.

  8. #8
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    Sorry resunltd, I can double-check but I think your diameter is too small.
    kecked, with beam correction you rotate on the yaw, with risley you rotate in roll angle. Nothing special about them.
    https://www.osapublishing.org/Direct...eq=0&mobile=no

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