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Maximum illumination power Discovery Kit NIR

Kaspar Sakmann
Prodigy 10 points
Other Parts Discussed in Thread: DLP9500

Hello,

we're researchers and interested in getting a DMD Discovery Kit for a beam shaping application. We're planning to use NIR light, most likely 1064nm. Unfortunately, we found that most DMDs  have very sharp power tolerance limits dropping down to a mere 10 mW/cm^2 for >700nm, while having 25W/cm^2 in the visible range (the only exception being the dedicated NIR DMD with 2-4 W/cm^2, which is unfortunately too slow for us with just 5kHz pattern rate). What is the reason for these sharp limitations? Are these measured damage thresholds or just guesses?

Our ideal wish would be:

tolerance: 2-4 W/cm^2 @ 1064nm

pattern rate of 32kHz

Could we use, e.g. the DLP 9500 outside its specifications? Maybe by additionally cooling it from the back? I'd also like to mention that we don't need this to work for trillions of cycles. Most of the time it'll be quite static. So if it breaks after 2 years we wouldn't care. If the DLP 9500 fits the above specs, could you give us a quote for the Discovery Kit 4100 with the DLP 9500. Would it also be possible to add an IR coating to the window?

Regards, Kaspar Sakmann

  • 0
    TI__Expert 6370 points

    Hello Kaspar,

    Using the DMD outside of the specifications voids the warranty, but it may be done. To extend the lifetime of the device as long as possible, keep it within the thermal specifications.

    Make sure that you check out the Wavelength Transmittance Considerations for DLP DMD Window application note to see the impact of the window on light transmittance, as it is lower in the IR range than the visible range.

    Discovery 4100 Kits can be purchased from distributors found on this page (they would handle quotes, etc.).

    The DLP9500 is not currently available with an IR window and it is not possible for customers to replace the window, as there is a lubrication environment inside the DMD, which cannot be opened.

    I hope this helps!

    Best regards,

    Trevor