|Window material designation||Corning Eagle XG|
|Window refractive index||At wavelength 546.1 nm||1.5119|
|Window aperture(2)||See (2)|
|Illumination overfill(3)||See (3)|
|Window transmittance, single-pass through both surfaces and glass||Minimum within the wavelength range 420 to 680 nm. Applies to all angles 0° to 30° AOI.||97%|
|Average over the wavelength range 420 to 680 nm. Applies to all angles 30° to 45° AOI.||97%|
(2) See the package mechanical characteristics for details regarding the size and location of the window aperture.
(3) The active area of the DLP230KP device is surrounded by an aperture on the inside of the DMD window surface that masks structures of the DMD device assembly from normal view. The aperture is sized to anticipate several optical conditions. Overfill light illuminating the area outside the active array can scatter and create adverse effects to the performance of an end application using the DMD. The illumination optical system should be designed to limit light flux incident outside the active array to less than 10% of the average flux level in the active area. Depending on the particular system's optical architecture and assembly tolerances, the amount of overfill light on the outside of the active array may cause system performance degradation.