4
Window Material and Color
Wavelengths of illumination and aiming beams should be taken into consideration when choosing window
material and color, to achieve the possible highest spectral transmission, lowest haze level and
homogeneous refractive index. It is suggested to use PMMA or optical glass with spectral transmittance
of illumination and aiming beams over 90% and haze less than 1%. Whether to use an anti-reflection
coating or not depends on the material and application needs.
Scratch Resistance and Coating
Scratch on the window can greatly reduce the performance of the EM3090. It is suggested to use
abrasion resistant window material or coating.
Window Size
The window must not block the field of view and should be sized to accommodate the aiming and
illumination envelopes shown below.
