!%Jenoptik Laser, Optik, Systeme GmbH%! has released a 22-page downloadable document titled “Crystal Optics Product Portfolio,” which gives specifications for the company’s retardation plates, polarization prisms, depolarizers, rotation plates, compensators, optical windows and lenses made of crystalline material. It notes that crystal optics fulfill a function in optical systems for applications in laser, metrology and medical technology, and in the semiconductor, aerospace, and security and defense industries. A chart details the materials, including crystalline quartz, sapphire and silicon, as well as their optical properties, including maximum transmission and reflection loss on two optical surfaces. The basics of polarization optics are outlined.