Opto-mechanical design of Fourier transform spectral polarization imaging system based on dual Wollaston prisms

Abstract

The integration of polarization and spectral imaging, which exploits the principle of spectral interference, has long been a subject of extensive research. However, existing literature lacks comprehensive discussions on the opto-mechanical design of Fourier transform spectral polarization imaging systems (FTSPIS) employing dual Wollaston prisms (DWP). We proposing a novel opto-mechanical design strategy for FTSPIS based on DWP. Specifically, the FTSPIS system is divided into three independent modules: telescopic objective lens with phase modulation module (PMM), eyepiece and splitting system with DWP, and secondary imaging system. For each module, a detailed optimization design process is presented, with special emphasis on the optical effects produced by each module and their compatibility with one another. A practical design instance is provided to illustrate the feasibility of constructing a visible-spectrum FTSPIS that can achieve a full field of view (FOV) of ± 5°. The effectiveness of the proposed design is verified through simulation analysis of interference patterns and demodulation. An elaboration on the mechanical structures for each module is also provided. These multi-degree-of-freedom adjustment capabilities enable precise control of the system’s performance, thus ensuring that the desired optical results can be achieved.