Calcium Fluoride Pyramid Optical Lens 

A beam splitter is an optical device that splits a beam of light into two or more separate beams. It is typically made from a material with a partially reflective surface, such as a glass plate or a prism. The beam splitter allows a portion of the incident light to pass through, while reflecting the rest of the light at a specific angle. Beam splitters are commonly used in various applications, including microscopy, interferometry, and telecommunications. In microscopy, they are used to direct light to different parts of the microscope, such as the eyepiece and the camera. In interferometry, they are used to split a beam of light into two paths, which then recombine to create interference patterns. In telecommunications, beam splitters are used in fiber optic networks to split and combine light signals.