The OPTOStokes 80:20 beam splitter is a precision dichroic mirrors component engineered for long-range laser ranging optical systems. Orion offers 1x2 Optical Splitters in 90:10 and 80:20 ratios. Need Help Finding a Product? 35 Beam Splitters from 3 manufacturers listed on GoPhotonics. designed for precision applications. split-ratio-tolerance: ± 5%; operating-range: 400 nm - 2. The Optical Splitters “split” the input optical signal received by it on input optical ports and provide the outputs simultaneously, in a pre-specified ratio 90:10 or 80:20.