The optical system of SPECTRLAB combines the advantages of two detectors: photomultiplier tubes and CCD detectors. Adopting an optimized Pasing Runge architecture, the mechanical structure of the patented optical system is exceptionally robust, while reducing the internal space volume. Internal constant temperature and pressure ensure that the optical system is not affected by external environmental changes and influences.This core technology lays an important foundation for the performance analysis of SPECTRLAB.