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Wavelength transmittance for DLP DMD window

Posted: 22 Jul 2014 ?? ?Print Version ?Bookmark and Share

Keywords:DLP technology? 3D scanning? digital micromirror device? DMD? spectroscopy?

The use of DLP technology in non-projection applications such as 3D scanning, optical networking, spectroscopy, vascular imaging, and others has gained significance. Various optical factors must be taken into consideration to facilitate these applications.

The digital micromirror device (DMD) efficiency observed in a specific application depends on applicationspecific design variables such as illumination wavelength, illumination angle, projection aperture size, overfill of the DMD micromirror array, and so on. Overall optical efficiency of each DMD can generally be estimated as a product of window transmission (2 passes), diffraction efficiency, micromirror surface reflectivity, and array fill factor. The first three factors depend on wavelength of the illumination source. This application report provides information specifically on transmittance of DMD windows in different regions of the electromagnetic spectrum.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at as "Wavelength Transmittance Considerations for DLP DMD Window".

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