The working principle of a dichroic mirror is to use optical coatings to decompose polarized light and separate light of different wavelengths according to the angle of incident light. By changing the angle of incident light, the display and separation of different colors can be achieved. Such as reverse blue and green, reverse green and blue, reverse blue and green and red, reverse green and blue and red, etc.

Dichroic mirrors, also known as dichroic mirrors (DM), are mainly used to separate the three primary colors of red, green and blue, which can improve light utilization and color saturation. Various gradient dichroic mirrors can be provided according to customer requirements.