Commercial-quality film polarizers are available. These linear polarizers have 25% transmittance for unpolarized light. Two crossed sheets have an average transmission of 0.04%. The sheets are neutral gray in color. It can be used as a variable attenuator.
Linear film polarizers are available in custom sizes.
Sandwiched type linear film polarizers are also available. In this models, a linear film polarizer is sandwiched between two polished BK7 glass discs and mounted on a black anodized aluminium threaded mount. The mounts are made with standard threads so that it can be mounted to any opto- mechanical mount which has similar thread.
|Polarizing efficiency||:||99 %|
|Polarizer sheet Thickness||:||0.18 mm|
|Spectral range||:||400 - 700 nm|
|Extinction ratio||:||≥ 500 : 1|