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DMD for 1070/1080 nm wavelengths

Meijie Li
Prodigy 20 points

Dear TI experts,

I would like to apply DMD for laser with wavelength 1070/1080 nm. May I know whether it is available? If it is, what is the max. input power density of the DMD? What is the optical efficiency? What is the max. size of the DMD that can be provided? Thank you in advance.

  • 0
    TI__Genius 9935 points

    Meijie,

    Welcome to the TI DLP&MEMS E2E forum.

    Our DMDs are specified for the visible light wavelengths -- 420 - 700 nm. However, they can be used into the NIR.

    These documents should help:

    http://www.ti.com/lit/an/dlpa031/dlpa031.pdf   Wavelength Transmittance Considerations for DLP® DMD Window

    http://www.ti.com/lit/wp/dlpa027/dlpa027.pdf   Laser Power Handling for DMDs

    Also, please see http://ti.com/mems to see the available DMDs.

  • 0
    TI__Guru 54705 points

    Hello Meijie,

    Welcome ot the DLP section of the TI-E2E Community. 

    At this time we do not offer a DMD with an IR window. Pascal is correct the visible DMDs can operate in the near IR but the IR limit of the visible DMDs is around 10 mw/cm2.

    Sincerly,

    Fizix. 

  • 0 in reply to Pascal DLP
    Prodigy 20 points

    Dear Pascal,

    Thank you very much for your info. But as Fizix also mentioned, the current DMD for visible lights should work below 10mW/cm^2. However I would prefer a DMD which can work at tens of W/cm^2 for NIR laser. It is mentioned in the paper 'Emerging Digital Micromirror Device (DMD) Applications' written by Dana Dudley in 2003 that "DMDs optimized for 1-2um use are therefore being made available and undergoing reliability testing." May I know whether it is possible to order a customized DMD for NIR light now? Also can the pitch size and the number of pixels be customized? What is the largest DMD that has been produced?

    Your answer would be quite important and helpful for my current design. Thanks a lot.

    Best wishes.

    Meijie 

  • 0 in reply to Meijie Li
    TI__Genius 9935 points

    Meijie,

    I understand the issues which you are raising. DMD technology is both complex, and highly optimized to achieve the performance which our DLP devices offer today. Unfortunately, customized DMDs such as you are describing are not available.

    However, as I mentioned earlier, the current visible light optimized DMDs are usable (at somewhat reduced light throughput efficiency, as far into the NIR as 2500 nm. See http://www.ti.com/lit/an/dlpa031/dlpa031.pdf

    It is also possible to make tradeoffs between peak power (with pulsed illumination) and average illumination power. See http://www.ti.com/lit/wp/dlpa027/dlpa027.pdf

    However, all of these possibilities are with the existing and available DMDs. See http://ti.com/mems