A polariser is an optical element that converts unpolarised light into linearly polarised light. Its core function is to filter light with specific vibration directions, finding widespread application in display technology, photography, and 3D imaging.
Core Principle
The operation of a polariser is based on the principle of dichroism, wherein materials exhibit differing absorption capacities for light with varying vibration orientations.
Its internal structure contains numerous minutely arranged parallel elements (such as iodine molecules or dye molecules).
When unpolarised light (with randomly oriented vibrations) passes through, light vibrations parallel to these structures are strongly absorbed.
Only light vibrations perpendicular to the structures are retained, ultimately outputting linearly polarised light.
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