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DLPs for MIR

EP
Prodigy 20 points
Other Parts Discussed in Thread: DLP4500NIR

Hello.

DLP seems to be great technology for instrumentation and I am thinking of some applications in MIR range.

Is it possible to use DMDs for wavelengths beyond 2.5 microns? If so, which type of a DMD would you suggest for evaluating.

Thanks.

Erwin

  • 0
    TI__Expert 6370 points

    Hi Erwin,


    Unfortunately, we do not offer a DMD that is optimized for MIR wavelengths.  However, we do offer a DMD with a window that is optimized for NIR wavelengths, the DLP4500NIR: http://www.ti.com/product/DLP4500NIR/description

    In the datasheet, you will find a graph of Window Transmittance Percentage, which falls to 90% at 2500 nm (and continues to drop with increasing wavelength). This DMD may work for your application, but be sure to check the handling ratings to ensure you do not break warranty .

    I hope this helps!

    Best Regards,

    Trevor

  • 0 in reply to Trevor Dowd
    Prodigy 20 points

    Hello Trevor,


    thank you very much for your answer.
    As I understood there is a window in front of the micromirrors which has an AR-coating for transmission of specific wavelength range. I checked the datasheet of the DLP4500NIR and read the application note DLPA031 conserning the transmittance of DMD windows but for me it is still diffucult to extrapolate the graph of the NIR window beyond 2.5 microns. Could you provide more information on that? I am interested in the range 3 to 5 microns.

    Is it theoretically possible to use DMD for these wavelengths if there is no window in front of the mirrors?


    Thank you.

    Erwin

  • 0 in reply to EP
    TI__Expert 6370 points

    Hi Erwin,

    The transmission drops precipitously at about 2600nm and averages about 10% out in the 3-5nm range. Unfortunately the NIR window and DMD will not provide much success in that range.

    Also, the DMD window cannot be removed. There is an environment inside the DMD that is necessary to the DMDs function.

    Best Regards,

    Trevor

  • 0 in reply to Trevor Dowd
    Prodigy 15 points
    Hi Trevor,

    We also have an application in the MidIR (4-5µm) wher we want to replicate a DLP-based device that we developed in the NIR.
    Are there any plan to provide DLP with CaF2 or any other MidIR transparent window?
    What would be the issue with removing the protection window?
    Void warranty, reduced repetition rate, reduced lifetime?

    Thanks in advance,

    Antoine
  • 0 in reply to Antoien Monmayrant
    TI__Expert 6370 points
    Hi Antoine,

    Currently, TI does not offer a DMD optimized for MidIR with a MidIR transparent window. If you would like to discuss a specific business opportunity requiring MidIR operation, send me an E2E friend request and then you can send a private message, but again currently there are no DLP offerings that are optimized beyond 2500 nm wavelength.

    Removing the DMD window will void the warranty and will render the DMD inoperable.

    Best regards,
    Trevor