What does 116 mean in the context of a beam splitter

In the context of a beam splitter, "116" refers to the clamping diameter of the optics, specifically 116.0 mm.

In optical systems, beam splitters are often mounted using mechanical holders or clamps that secure the optical element in place. The number "116" indicates the diameter of the optical component that the mount is designed to hold, measured in millimeters. For example, the CMBS080 beam splitter from Opto Engineering is described as a 45° beam splitter with a mount suitable for 116.0 mm clamping diameter optics . This ensures proper alignment and stability of the beam splitter within the optical setup. The clamping diameter is critical because it determines compatibility with lenses, illuminators, or other optical components. Using a mount with the correct diameter prevents mechanical stress, misalignment, or damage to the optical element, which is especially important in precision applications like interferometry, laser systems, or imaging setups . In summary, "116" is not a model number or optical property of the beam splitter itself; it specifically denotes the mechanical size of the mount required to hold the optical element securely.