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Thread: Help - 405nm Laser Polygon Mirror Scanning

  1. #1
    Join Date
    Dec 2020
    Posts
    11

    Default Help - 405nm Laser Polygon Mirror Scanning

    Alright I'm designing a laser scanning device that uses a polygon mirror motor found in laser printers.


    The laser beam must always be in focus to get the highest resolution scans, therefore all laser printers uses a "F-Theta" lens so that the laser beam
    focal point will always be in focus for the entire scanning surface. F-Theta lens used in laser printers are specifically designed for 1 axis laser scans only.


    Heres the problem, the F-Theta lens found in laser printers are not designed for the UV wavelength lasers such as 405nm. They originally use a different wavelength most likely infrared.


    I spent days searching on the internet to find a company/manufacturer that sells these 1 axis F-Theta lens and couldn't find any.
    Anyone here knows a company or maybe probably can tell me how I can make my own F-Theta lens used specifically for 405nm lasers?
    (Yes, I know many factors must be know such as the polygon mirror size and scanning distance etc... etc)


    I do not want to use the multi axis f-theta lens used with galvo scanning motors. I would like to use f-theta lens specifically for 1 axis scans.
    Have any other ideas how I can get the focal point always in focus throughout the entire 1 axis?


    Please view the attached picture so that you can get an idea what I am talking about.
    Also please do not mention about other people's project which is irrelevant to mine, I do not want to use a transparent prism.


    Thanks.
    Attached Thumbnails Attached Thumbnails Laser_unit_dell_p1500_print.jpg  


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