A non-polarizing beamsplitter is an optical device designed to split incident light into two separate beams while maintaining the same intensity ratio for both S-polarized (perpendicular) and P-polarized (parallel) light components.

Unlike polarizing beamsplitters, which separate light based on its polarization state, non-polarizing beamsplitters ensure that the transmitted and reflected beams have nearly identical polarization characteristics.

They are commonly used in applications where preserving the polarization state of the light is essential, such as in laser systems, imaging, and interferometry.