• Resolved

DLP650LNIR: Reflectivity data

Prodigy 50 points

Replies: 8

Views: 111

Part Number: DLP650LNIR


I'd like to purchase this chipset (DLP650LNIR) for my NIR application, but reflectivity data is provided only at @1064 nm. Do you have reflectivity data of the chipset in other wavelength range from 660 nm to 900 nm?



  • Hello Sang,

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

    I will check to see if there is data available.

    Do you have a specific wavelength and reflectivity level requirement in mind?


  • In reply to Fizix:

    Hi Fizix,

    Thanks! Yes, in fact, I want to use NIR light sources in 660, 690, 785, 808, 860 nm. I am trying to compare it with LCoS device where its ball park estimate of reflectivity is about 64%.


  • In reply to Sang Hoon Chong:

    Hello, Bryan.  Please see Figure 4 in this application note: http://www.ti.com/lit/an/dlpa031d/dlpa031d.pdf . It shows the transmission curve for the NIR2 window from 350 nm to 2000 nm.

  • In reply to Raecine Meza:

    Hi Raecine,

    Thanks a lot for the info. Is DLP650LNIR chip covered with NIR2, not NIR?

    DMD reflectivity info would be great. Do you have any document that has the data?



  • In reply to Sang Hoon Chong:

    Yes, the NIR2 curve is the right one for DLP650LNIR.  Also, the reflectivity of the micromirrors for the device is listed in the datasheet as nominally 94%.  See section 6.10 and 6.11 of the datasheet, http://www.ti.com/lit/ds/symlink/dlp650lnir.pdf.  

  • In reply to Raecine Meza:


    Yes, I am aware of the nominal reflectivity measured @1064 nm. The NIR region that I am interested in ranges from 660 - 850 nm, and I wonder if the reflectivity would be better or worse than the nominal. Is there any data available?

  • In reply to Sang Hoon Chong:

    Sang Hoon Chong

    The micro mirror reflectivity matches aluminum, so you can look at the reflectivity curve for aluminum to estimate the micro mirror surface reflectivity versus reflectivity.

    Total optical efficiency of the DMD includes window transmission (2 passes) fill factor, diffraction, and micro mirror reflectivity all versus wavelength.

    There is an app note on TI.com that covers each of these areas. You can use the math example as a starting point to determine diffraction with your desired wavelength and F numbers.


    Carey Ritchey

    Texas Instruments

    Industrial Business Development Manager

    DLP® Enterprise & Cinema Display


  • In reply to Carey Ritchey:

    Got it. This is great. Thanks!