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DLP4500NIR: Window Transmittance at 2.5-2.7 micron

Part Number: DLP4500NIR

Tool/software:

Hello,

I am using light between 2.5 and 2.7 micron for my experiment and am looking for a DMD for beam shaping.

As far as I can see, the main limitation to the DMDs is the window transmittance. Do you have any data on the transmittance between 2.5 and 2.7 micron?

Or alternatively: would it be possible to replace the window with another material/make a custom design e.g. with calcium fluoride so that it becomes transmissive at these wavelengths?

Thanks,

Miriam

  • Hello Miriam, 

    Thanks for using the DLP E2E forums!

    Window transmittance data can be viewed from the following document -> Wavelength Transmittance Considerations for DLP® DMD Window (DLPA031)

    Unfortunately, TI does not support changing the windows on DMDs and TI does not have a process that is recommended to replace the windows. There are proprietary materials inside the DMD so the warranty would be voided by removing the window.  We do not offer DMD without a window as the proprietary materials are required to ensure reliable operation of the micromirrors. You can certainly remove the window and do testing, but I wanted to let you know that we do not provide support in any way for doing so and do not guarantee that the mirrors will continue to operate for any length of time.

    Hope this helps!

    Regards, 

    Tristan Bottone

  • Thank you very much. Do you know whether it is possible to replace the existing window with a slightly thicker window? Or are there limitations upwards? As far as I can see the window that is in this DMD is ~0.65mm thick

    Regards,

    Miriam

  • Miriam, 

    While it is technically possible to replace the DMD window, we strongly advise against doing so. Texas Instruments does not provide support for this modification, and we cannot guarantee that the micromirrors continue to function reliably over time if the DMD window is altered or removed with a different window. 

    Additionally, there are no customization options available for DMD windows, as they are made with proprietary materials that are essential for the proper operation of the micromirrors. Since there are proprietary materials inside the DMD if the window is removed the warranty of the DMD would be voided. The proprietary materials are required to ensure reliable operation of the micromirrors and would get damaged once the top window is opened.

    Regards, 

    Tristan Bottone