The 355nm narrow band filter is used to pass laser beams with a wavelength of 355nm through the filter. When measuring very short or very long wavelengths, the CCD camera is not sensitive, and the required signal may be overwhelmed by extraneous light of other wavelengths. This filter can eliminate extraneous wavelengths;

An NVG lens is an optical device designed to enhance night vision. By collecting and amplifying weak light, NVG lenses assist users in making clear observations and performing operations in low-light environments.

The working principle of the Paul prism is based on total reflection. When light enters from the largest rectangular face of the prism, it undergoes total reflection at two inclined faces before exiting from the original incident face;