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Illumination power density for 532nm laser.

Lorin Baird
Prodigy 95 points

How much illumination power density (W/cm^2) can the DLP 6500 EVM take for 532nm light?

I think that the DMD can take 20-25 W/cm^2 in the 532nm range from what I have read on the forums and datasheets, but I just wanted to make sure that I have the correct numbers for my laser.

It really bothers me that the max illumination is .68 mW/cm^2 for the range for below 420nm. This is just for my peace of mind. 

  • 0
    TI__Guru 54315 points

    Hello Lorin,

    The number you have given could be taken as a rough estimate, but the non-hermetic DMD packages are primarily limited by the array temperature.  The array temperature will depend on the input optical power, the thermal conductivity of the package and the type and efficiency of the heat sink employed. 

    I suspect that 25W/cm^2 is probably a little high, even with a very good heat solution.  We always recommend that testing be done with the heat sink to be used and apply lower optical power.  For example, if 5W/cm^2 raises it 15° C with a given heat sink over operating it with no light then operating with 10W/cm^2 will raise it 30° C. 

    Regarding the 0.68mW/cm^2 in the UV region, the non-hermetic parts are not suitable for UV operation and this is to prevent any significant UV exposure to the part.

    Fizix