39-404 50.8 mm Dia. Zinc Selenide Protective Flat Window; t=5 mm Uncoated

The 39-404 is a 50.8 mm diameter Zinc Selenide (ZnSe) protective flat window, with a thickness of 5 mm and no coating. This window is sourced from Edmund Optics and is currently in stock.

As a flat window, it is designed to protect optical components from environmental hazards such as dust, dirt, and moisture, without introducing any optical aberrations. The window's base shape is circular, a common design for such components due to its ease of integration into various optical systems.

The material of the window is Zinc Selenide, identified in the item data as 'znse marple-1964'. Zinc Selenide is a popular material for optical windows due to its excellent transmission properties in the infrared region of the spectrum. The window's wavelength is specified as 587.6 nm, which is in the visible light spectrum.

The window is uncoated, meaning it does not have any additional layers applied to enhance its properties. This can be beneficial in certain applications where a specific coating might interfere with the system's performance. However, it's important to note that uncoated windows may have higher surface reflections, which could reduce the overall transmission of the system.