The recommended cleaning solution is "Sparkle" brand glass cleaner (purple variant), applied with Q-tips or Kimwipes. For stubborn residues, xylene, acetone, or 70% ethanol in distilled water can be used, with xylene being the most effective but potentially damaging to optical. This discussion focuses on the proper cleaning techniques for polarizing beamsplitter cubes, emphasizing the importance of using appropriate materials and methods to avoid damaging coatings. When I went to clean the side that is towards your eye, the gold colored reflective coating turns out is super soft and just wiped off the glass. Always unpack or open optics in a clean, temperature-controlled environment. Specifications, descriptions and illustrations in this manual are as accurate as known at. A beam splitter or beamsplitter is an optical device that splits a beam of light into a transmitted and a reflected beam. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. In its. am Splitters/Combiners. The standard product is designed for use in the visible spectrum 400-700 nm wavelength).