A high-birefringence optical material suitable for implementation in optical systems is sought. This material has several qualities of interest beyond high birefringence: high hardness, making it amenable to standard polishing and manufacturing processes; low CTE (coefficient of thermal expansion); low CTRI (coefficient of thermal refractive index); low absorption at 1.55 micrometers; and reasonable bulk density. A material is sought that can be processed and handled using standard techniques.
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