The BSW18 from Thorlabs Inc is a Beam Splitter with Beamsplitter Diameter 50. More details for BSW18 can be seen below. A beamsplitter is an optic that splits light into 2 directions. The split ratio of light transmittance and reflectance is 1:1 and is called a half mirror. Advantages are: minimal. The Keysight Technology, Inc. Circular beamsplitters, plate beamsplitters and cube beamsplitters can be purchased for polarizing or non polarizing beamsplitting. Getting that wood splitter that you are about to build to stand the test of time requires a few components to be sized properly in order to withstand the force you will be submitting it to. The I-Beam is a big factor here and making sure you have what you need in size and weight will insure nothing. Is it easy to bend an I beam on a log splitter? I have a 6" I beam but it is only about 1/4" thick. 6 µm at 45° angle of incidence.
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