Hi,
We've been using a couple of DMDs in the lab - one is the 0.3" LightCrafter and the other is a 0.7" XGA device. We noticed that above a certain illumination power, the DMDs appear to develop dark spots in their images, which go away when the beam is removed. It seems like this is caused by heating on the DMD.
We were wondering if there were ways to overcome this issue, as we need a greater illumination power for our applications. We tried a simple 12V fan + heatsink, but don't get a large improvement. So we were wondering:
1. If better cooling would allow us to use, say, twice the amount of light we are now?
2. If changing the illumination wavelength would be better, for example using NIR? In this case, do the DMDs work well for these wavelengths?
Thanks!