The Olympus BX3M-RLAS-S is a coded reflected light illuminator designed for the BX53 upright microscope platform. This illuminator integrates a high-efficiency LED light source with a multi-cube turret supporting brightfield (BF), darkfield (DF), polarization (PO), and differential interference contrast (DIC) imaging modes — all in a single, compact unit. The coded design enables automatic recognition of the illuminator configuration by the BX53 system, streamlining setup and ensuring reproducible results across imaging sessions. Ideal for materials science, metallurgy, semiconductor inspection, and industrial quality control applications requiring versatile reflected light contrast techniques.