supported wavelength of DLP LightCrafter

Shibuya-san,

Welcome to the DLP & MEMS E2E forum.

The DLP devices (such as the DLP3000 DMD) are specified for visible light (420-700 nm). Howover, they do work outside this range, particularly into the NIR. However, the window coating is optimized for the visible range, and other issues (diffraction, UV damage potential, etc.) must be considered.

In the case of the DLP LightCrafter development kit, it is supplied with a light engine which uses visible wavelength (RGB) LEDs. The engine makes use of dichroic filters to combine the RGB LEDs into the same light path. The wavelengths for which these dichroic filters are designed are very specific to the LEDs used.

If you wish to use the DLP LightCrafter's supplied light engine with, say, a NIR LED, the internal dichroic filters must be removed. In that case, the LightEngine would not be able to mix both visible and IR LEDs. The NIR LED would need to be used "straight through". This involves a major modification of the light engine. However, a NIR light engine can certainly be designed and used with the DLP3000 DMD.

While the DMD may work at wavelengths outside the data sheet limits, we have not tested these ranges. Therefore we do not recommend operating the DMD beyond the data sheet specifications.