Cube beamsplitters perform best with monochromatic light sources. The split ratio of light transmittance and reflectance is 1:1 and is called a half mirror. Advantages are: minimal. Beam splitters are critical for managing optical power flow in a wide range of setups. Selecting the right component involves navigating trade-offs between power handling, polarization sensitivity, chromatic dispersion, and mechanical stability. They're these nifty tools we use to.