30° - 60° - 90° Littrow prism
The apex angles of the 30°-60°-90° Littrow prism are 30°, 60° and 90° respectively. It is usually made of optical glass and has specific optical properties that allow light to be reflected and refracted internally to select and separate light of specific wavelengths. When coated, the ray deviation is 60°; when uncoated, it is an ideal choice as a dispersing prism, and the reflected light can return along its original path. It can meet requirements for different shapes, glass types and coatings.
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