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DLP9500: VIS DMD for Infrared application light power limit

Part Number: DLP9500
Other Parts Discussed in Thread: DLP650LNIR, DLPC410

I have a DLP9500 DMD and the technical brochure saids that the incident light power should not exceeds 10mW/cm^2. Unfortunately, we have an application that the power level is approximately 100mW/cm^2. 

My questions are:

1. where does the light power limit come from?

2. can I add thermal dissipator/ fan to cooling it in order to use it with higher power that the limit?

Thanks!

  • Hello Siyuan,

    This device has not been rated for NIR and does not have NIR Anti-Reflective (AR) coatings on the window.  As such the NIR threshold is set low.  

    The visible AR coatings are not well behaved into the NIR.  TI will not warrant the part when operated outside the listed operating conditions.

    You can look at the application note Wavelength Transmittance Considerations for DLP DMD Windows on TI.com https://www.ti.com/lit/pdf/dlpa031

    Depending on wavelength a significant amount of power can be lost.  For example at 1550 nm ~30% of the power will be lost in each pass through the window, there are two passes so ~50% of the power will be lost.

    Our DLP650LNIR DMD is a much better choice for your use case  and it is controlled by the same DLPC410 controller that you would use for the DLP9500 DMD

    I hope this helps.

    Fizix