Properties of an optically addressable liquid crystal spatial light modulator (SLM) used for fast Area Printing metal additive manufacturing (3D printing)

An optically addressable liquid crystal spatial light modulator (SLM) is used for dynamic laser beam shaping used in a unique, fast metal additive manufacturing process (3D printing) [1]. We address challenges of using our SLM exposed continuously to high power kW-MW lasers. Control of liquid crystals is coupled to the optical-response of the photoconducting insulators that affects contrast, switching speed, and laser power handling. We compare liquid crystal materials laser damage rationalized based on their thermal properties, and highlight device-level stresses via computational modeling. Key areas of liquid crystals and semiconductor properties are presented that impact optically addressed SLM for power switching applications. [1] https://www.seurat.com/area-printing