66-201 25 mm Dia. Zinc Sulfide Protective Flat Window; t=3 mm Uncoated

The 66-201 is a 25 mm diameter Zinc Sulfide (ZnS) protective flat window, with a thickness of 3 mm and no coating. This window is sourced from Edmund Optics, a reputable vendor in the optical industry.

As a flat window, this component is designed to protect optical surfaces from damage, while minimally affecting the light path. Its base shape is circular, a common design for such components due to its isotropic properties.

The window is made of Zinc Sulfide, a material with the ID UVFS MAL-1965. Zinc Sulfide is known for its excellent transmission properties in the ultraviolet, visible, and near-infrared regions of the spectrum. The wavelength of 587.6 nm, specified in the item data, falls within the visible light spectrum, indicating that this window is suitable for use with visible light.

The window's shape is described as a thin lens, suggesting that it has been fabricated with a high degree of precision. This is particularly important in applications where optical aberrations need to be minimized.

Notably, this window is uncoated. While coatings can enhance the performance of optical components in specific applications, an uncoated window can be advantageous in certain scenarios. For instance, it can reduce reflection, simplify cleaning, and lower costs.