This Motorized Variable Attenuator / Beamsplitter consists of special design Opto-mechanical Adapter and Precision Opto-mechanical Holder 840-0193. Two Thin Film Brewster type polarizers, which reflect s-polarized light while transmitting p-polarized light, are housed into the Adapter. Quartz Half Waveplates are housed in Motorized Rotation Stage 960-0161.