The Open Polarimeter (“Opol”) is a phase-based, high-resolution laser polarimeter formed from a small number of inexpensive optomechanical parts. The complete instrument can be assembled from scratch in two days for less than US$250, using only a 3D-printer and a benchtop milling machine. However despite its low cost Opol achieves a high accuracy of a few millidegrees, comparable to far costlier commercial instruments. It is released here as open hardware, with technical diagrams, a full parts list, and source-code for its firmware included as Supporting Information. Beyond polarimetry, Opol’s easy-to-build and versatile optical mounting system is likely to prove useful for a wide variety of optical systems.

中文翻译：

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开放式旋光仪：由廉价的光机械零件制成的高分辨率仪器

开放式旋光仪（“ Opol”）是一种基于相位的高分辨率激光旋光仪，由少量廉价的光机械部件组成。只需使用3D打印机和台式铣床，即可在两天内以不到250美元的价格从头开始组装整个仪器。但是，尽管价格低廉，Opol仍可达到几毫度的高精度，这与价格昂贵的商业仪器相当。它在此处以开放式硬件的形式发布，带有技术图表，完整的零件清单以及作为支持信息包含的固件源代码。除极化分析外，Opol易于构建且用途广泛的光学安装系统可能已证明对多种光学系统有用。