The optical losses in beam splitters vary based on their design. Devices with metallic coatings typically exhibit higher losses, while those with dichroic coatings can achieve minimal losses. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. High-quality coatings can minimize reflection losses and enhance transmission. The performance of optical beam splitters can significantly influence the overall performance of laser-based instrumentation and measurement systems.