43-637 31.75 mm Dia. Sapphire Protective Flat Window; t=1 mm Uncoated

The 43-637 is a circular, flat window with a diameter of 31.75 mm and a thickness of 1 mm, making it a thin and lightweight option for various optical applications. This window is sourced from Edmund Optics, a reputable vendor known for its high-quality optical components.

The window is made of sapphire, a highly durable and scratch-resistant material with the chemical formula al2o3. Sapphire is an excellent choice for protective windows due to its ability to withstand harsh environments and maintain high optical performance. It has a refractive index of approximately 1.76 at the wavelength of 587.6 nm, which is a common reference point in optical calculations.

The window is uncoated, meaning it does not have any additional layers applied to its surface. This can be beneficial in applications where the natural properties of sapphire are desired, or where additional coatings may interfere with the system's performance. However, it's important to note that uncoated windows may have higher reflectivity compared to coated ones, which could affect the overall efficiency of the optical system.