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How much laser power can the DLP LightCrafter Evaluation Module DMD be illuminated with?

RENJU MATHEW
Prodigy 90 points

I know that according to the white paper on the subject,

"The specification is 25 W/cm2 input power in the visible spectrum, where the pixel reflectivity is about 92%,so that about 8% of the energy is absorbed by the pixel surface (2) (see Figure 7). For ranges outside the visible spectrum, use the power specification in the data sheet and the absorption for the wavelength being used."

I am using a low power laser at 532 nm. I'm not sure what data sheet is being referred to or where in the data sheet the requisite information can be found. Could you please point me in the right direction. Thank you.

(Please note that this is after successful removal of the LightEngine from the LightCrafter.)

  • 0
    TI__Intellectual 2305 points

    Hi Renju,

    It refers to the datasheet of the DMD used. Presently there are 3 LightCrafter models available, and each of them uses a different DMD.

    The “DLP® 0.45 WXGA DMD” datasheet at www.ti.com/.../technicaldocuments (This is for the DLP LightCrafter 4500).

    The “DLP® 0.65 1080p DMD” datasheet at www.ti.com/.../technicaldocuments (This is for the DLP LightCrafter 6500).

    The “DLP® 0.95 1080p DMD” datasheet at www.ti.com/.../technicaldocuments (This is for the DLP LightCrafter 9500).

    [Edit]:  For a 532nm wavelength, the Maximum Illumination Power Density (ILL) is thermally limited.  Hence, requiring calculation to confirm that the temperature doesn't go above limit (that could affect device lifetime of the DMD).  However, care should be taken when using laser illumination not to cause surface ablation of the micrormirrors.

    “Thermal Information” and “Micromirror Array Temperature Calculation” sections contain the values, explanation and sample calculation.

    Note: There are other DMDs (with different array sizes, pattern speeds, etc) besides the ones listed above. The list of DMDs for Advanced Light Control applications is at www.ti.com/.../products.page

    Regards,
    A214529