By precisely controlling internal prism angles in these calcite polarizers, a very efficient linear polarizer is produced. Meadowlark Optics offers Glan-Thompson Polarizers, intended for precision optical instrumentation and low power laser applications. Key advantages of Glan-Thompson Polarizers include excellent extinction ratio performance and a broad spectral range. Our Glan-Thompson Polarizers are supplied in a black anodized cylindrical housing for easy mounting.