Until recently, the construction of polarizers for operation below similar to260 rim were limited to materials such as magnesium fluoride and crystalline quartz, These materials have a much smaller birefringence than calcite, but unlike calcite they have good transmission below 200 am. These materials are, however, not well suited for Glan-Taylor-type polarizer designs, as they do not produce a large angular separation of the polarized components, A new material, alpha-barium borate, has recently become available, which transmits to just below 200 run and has a birefringence that approaches that of calcite. We analyze the performance of various polarizer designs that use this material. Results are presented that compare theory with experimental investigation of a manufactured device. [References: 8]
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