A beam splitter is a lens that partially transmits light and partially reflects it to achieve a spectral effect. A special film is coated on the surface so that the incident light can be reflected half and transmitted half, so that a beam of light is divided into a reflected beam and a projected beam. One beam forms two beams. The light sheet reflects part of the incident light energy, absorbs a relatively small amount, and transmits the remaining energy. The beam splitter has obvious neutral color characteristics.
The dichroic mirror is formed by vacuum evaporation of a multi-layer dielectric film. There is no problem of metal film absorption. The total penetration and reflection ratio is close to 100.
Function: It is made by vacuum evaporation. After the light passes through the filter, the penetration ratio can be changed. For example, it can be half-transmitted and half-reflected, and has the characteristics of ground absorption.

Commonly used spectral ratio: (can be customized according to requirements)

T:Transmittance       R：Reflectivity

T:R=50%:50%   R:T=99%:1%

T:R=60%:40%   R:T=98%:2%

T:R=70%:30%   R:T=95%:5%

T:R=80%:20%   R:T=90%:10%

T:R=90%:10%   R:T=80%:20%

T:R=95%:5%    R:T=70%:30%

T:R=98%:2%    R:T=60%:40%