DLP650LNIR: Reflectivity data

Sang Hoon Chong

Part Number: DLP650LNIR

Hi,

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?

Thanks,

Bryan

over 4 years ago

0 Fizix over 4 years ago

TI__Mastermind 43095 points

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?

Fizix

0 Sang Hoon Chong over 4 years ago in reply to Fizix

Prodigy 50 points

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%.

Bryan

0 Raecine Meza over 4 years ago in reply to Sang Hoon Chong

TI__Prodigy 675 points

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.

0 Sang Hoon Chong over 4 years ago in reply to Raecine Meza

Prodigy 50 points

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?

Thanks,

Bryan

0 Raecine Meza over 4 years ago in reply to Sang Hoon Chong

TI__Prodigy 675 points

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.

0 Sang Hoon Chong over 4 years ago in reply to Raecine Meza

Prodigy 50 points

Thanks!

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?

0 Carey Ritchey over 4 years ago in reply to Sang Hoon Chong

TI__Intellectual 1815 points

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.

www.ti.com/.../dlpa083

0 Sang Hoon Chong over 4 years ago in reply to Carey Ritchey

Prodigy 50 points

Got it. This is great. Thanks!

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DLP650LNIR: Reflectivity data