The cost and lead times for Germanium optical components have skyrocketed. Enter SiLWIR™ Protective Windows by MidOpt®, utilizing a more highly transmissive silicon material optimized for Long-Wave-InfraRed (LWIR) imaging applications. SiLWIR Windows feature abrasion-resistant DLC (diamond-like carbon) and AR coatings. A lightweight, far lower cost and far shorter lead time alternative when compared to Germanium, SiLWIR™ windows are also more thermally stable and breakage-resistant. Silicon will operate at temperatures up to 150°C, while Germanium is usually limited to around 70° C.

MidOpt
https://midopt.com/landing_page/silwir-silicon-protective-windows-for-machine-vision-industrial-imaging/