Beam splitters are passive optical devices and typically do not consume electrical power.

Beam splitters function by dividing an incident light beam into transmitted and reflected components, either at a fixed or adjustable ratio, depending on the design . Common types include cube beam splitters, made from two prisms cemented together, and plate beam splitters, which are thin coated glass plates . Polarizing and dichroic beam splitters separate light based on polarization or wavelength, respectively . Since beam splitters operate passively, they do not require an external power source. The “power” associated with a beam splitter refers to the optical power of the light beam being split, not electrical consumption. For example, a 50:50 beam splitter will divide the incoming light so that roughly half is transmitted and half is reflected, but the device itself does not draw energy . Some specialized beam splitters, such as variable or tunable splitters, may incorporate mechanical or electro-optical components to adjust the splitting ratio. In these cases, minimal electrical power may be used to drive actuators or control electronics, but the optical splitting itself remains passive . In summary, standard beam splitters do not use electrical power, and their operation depends entirely on the incident light. Any power considerations are related to the optical intensity of the beam rather than the device's energy consumption.