The 68-515 is a circular Zinc Selenide (ZnSe) Flat Window, boasting a diameter of 50 mm and a thickness of 2 mm. This protective window is designed to withstand harsh environments while maintaining high optical performance. The window features a Broadband Anti-Reflective (BBAR) coating on both the front and back surfaces, optimized for the 3-12 µm wavelength range. This coating significantly reduces surface reflections, enhancing transmission and overall system efficiency. The ZnSe material is chosen for its excellent transparency in the infrared region, making it ideal for infrared applications. The window is designed in a Thin Lens shape, which can be beneficial in certain optical systems. This window is available from Edmund Optics, a leading vendor in the optical industry, and is currently in stock.