1. attenuation is realized by two polarizers and a half-wave plate. P 1 realizes polarization function, rotates HWP for polarization rotation, and P2 realizes polarization detection. So as to realize light energy attenuation.

2. Two Gland prisms realize light energy adjustment, and the wavelength range of the covering light is wide. The input laser is required to be linearly polarized light. Rotate the gland prism 1 to realize laser energy attenuation, and the gland prism 2 performs polarization analysis.