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Bristol Instruments, Inc. - 872 Series LWM 10/24 LB
Photonics Dictionary

polygonal mirror

A polygonal mirror, also known as a multifaceted mirror or facet mirror, is a type of optical component used in various laser systems, optical scanners, and imaging devices. It consists of a flat or slightly curved mirror surface with multiple reflective facets arranged around its perimeter in a polygonal shape, typically a polygon with three or more sides (e.g., triangle, square, hexagon).


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Each facet of the polygonal mirror is angled at a precise orientation relative to the mirror's axis. When the mirror rotates about its axis, each facet sequentially reflects light beams, causing them to scan or sweep across a defined area. The speed and direction of the mirror's rotation determine the scanning pattern and speed of the reflected light beams.

Polygonal mirrors are commonly used in laser printers, laser barcode scanners, laser engraving systems, and laser show projectors, among other applications. They provide a compact and efficient means of scanning laser beams over a two-dimensional area, enabling rapid and precise positioning of the laser light for various purposes, such as printing, scanning, marking, or display. Additionally, the simplicity of their design and operation makes polygonal mirrors a cost-effective solution for many optical scanning applications.
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