Filters are flexible

Custom, variable, metallic neutral-density filters and geometric beamsplitters with variable beamsplitting ratio have transmission and reflection defined by a computer-generated geometrical beamsplitter. Software and photolithographic fabrication allow flexibility in achieving linear and nonlinear patterns in different sizes for prototype and serial quantities. A variety of substrate materials such as fused silica are available. The optical density ranges from nearly zero to four or five, depending on customer specifications.
POG Präzisionsoptik Gera
Gera, Germany
www.precisionoptic.com