Angle of incidence affects a beamsplitter by changing its reflection and transmission, its response to s- and p-polarized light, and the direction of the output beams. For dichroic coatings, it can also shift the wavelength transition between reflection and transmission. A specified splitting ratio therefore applies…

To choose a ZnSe lens, work from the system outward. First confirm the exact wavelength band and laser power, and check that zinc selenide is the right material. Then choose the material grade, calculate the focal length from the spot size and depth of focus…