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DLP780TE: Percent reflection

Art Mecina
Genius 16505 points
Part Number: DLP780TE

Hi Guys,

Good day.

Our customer is wondering on what would be the % reflection at 405nm for the DLP780TE?

Thanks,

Art

  • 0
    TI__Expert 3700 points

    Hello Art.

    The diffraction efficiency for this device is ~90% at 405nm and f/2.0, and the window transmission is as shown in app note DLPA031E on ti.com is >97%.

    Per the datasheet, the device is not specified to operate in this wavelength region but might be acceptable for experimentation purposes and certain applications.

    Regards,

    Matt 

  • 0 in reply to Matt Soucek
    TI__Genius 16505 points

    Thanks for looing into this Matt! Below is the response from the customer in verbatim:

    "Our application would use LED sources, I was imagining the incoming light coming in at 29deg and using the law of reflection the light will reflect at normal incidence to the DMD, and then reimage the image produced on the DMD. Is this an incorrect way to think about how DMD's work? Where does diffraction efficiency come into play? Thanks for the help!"

    Regards,

    Art

  • 0 in reply to Art Mecina
    TI__Expert 3700 points

    Hi Art,

    The customer is on the right path.

    For the question on diffraction efficiency, we have a helpful app note on ti.com. The lit number is DLPA083A and it is titled "DMD Optical Efficiency for Visible Wavelengths." There are sections on mirror diffraction efficiency and overall device efficiency. These are the basic explanations, and there are calculation examples for the legacy pixels (we will have to update for HEP).

    Regards,

    Matt