基于双直角分束器设计了一种反射式静态傅里叶变换光谱仪光学系统,并搭建了样机。该光谱仪光学系统的分光装置采用双直角分束器,其他光路全部采用反射式结构,有效折叠光路,与透射式静态傅里叶光谱仪相比,系统体积减小一半以上。用汞灯作为静态傅里叶光谱仪光源时,得到了404.7,435.8,546.1,577.0 nm的峰值谱线,实验结果很好地复原了汞灯实际光谱;用波长为650 nm的激光进行实验,光谱分辨率约为5.93 nm,与理论计算结果基本相符。该光学系统具有结构紧凑、体积小、重量轻、抗震性强等诸多优点,可为小型化、便携式静态傅里叶光谱仪器的研制提供技术支持。

An optical system of reflective static Fourier transform spectrometer is designed based on the double right-angle beam splitter, and the prototype is built. The light splitting device of the spectrometer optical system adopts double right-angle beam splitter, and the other optical paths adopt the reflective structure to fold the optical path effectively. Compared with the transmission-type static Fourier spectrometer, the volume of the system is reduced by more than half. The peak spectrum lines of 404.7,435.8,546.1, 577.0 nm are obtained by using mercury lamp as the light source of static Fourier spectrometer. The result shows that the actual spectrum of the mercury lamp is well reconstructed. The experimental results show that the spectral resolution is about 5.93 nm at the laser wavelength of 650 nm, which is consistent well with the result of theoretical calculation. The optical system has many advantages, such as compact structure, small size, light weight, strong seismic resistance, etc. It can provide the technical support for the development of miniaturized and portable static Fourier spectrometer.