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DLP650LNIR: What are some ways to mitigate diffraction when using a collimated laser with a DMD chip?

JJDLP
Prodigy 20 points
Part Number: DLP650LNIR

I'm using a collimated NIR laser with a DMD chip and I want to eliminate the diffraction effects from my projected image.  My setup is a common projection system where I'm imaging the surface of the DMD chip.

Is there a common way to reduce the coherency of the laser?  Would dithering work? 

Thanks for your help!

  • 0
    TI__Mastermind 48330 points

    Hello Jeremy,

    Welcome to the DLP section of the TI-E2E forums.

    So as I understand your setup, you are using a collimated NIR laser to illuminate a DMD and then a lens after the DMD to re-image the surface of the DMD on a screen or production surface of some kind.

    A lens should re-converge the diffraction patterns back to a coherent image at the focus of the lens.  

    Is your lens coated for NIR?  If not this could introduce unwanted reflections at the lens.

    What diffraction effects are you experiencing?  A picture would be very helpful, but I know that could be a little challenging in the IR.

    Fizix

  • 0 in reply to Fizix
    Prodigy 20 points
    Thanks, Fizix. I'm being proactive as I am just now constructing the system. I'll report back once I have the setup is complete.