PW1537C 1.5 in Dia. N-BK7 Round Plane Optical Window; t=0.375 in Uncoated

The PW1537C is a 1.5-inch diameter, flat optical window made from N-BK7 glass, a popular material for its excellent optical properties and high damage threshold. This window, sourced from Laser Components, has a thickness of 0.375 inches and is uncoated, making it suitable for a wide range of applications.

The window's geometry is circular with a diameter of approximately 38.1 mm, providing a large aperture for beam transmission. The thickness, at 9.525 mm, is thin enough to minimize optical aberrations while being robust enough for practical use. The window's shape is that of a thin lens, which can be beneficial in certain optical systems.

The N-BK7 material, also known as Borosilicate Crown, is a high-quality glass with a low coefficient of thermal expansion, making it resistant to thermal shock. It has a refractive index of approximately 1.5168 at 632.8 nm, the wavelength for which this window is designed.

The window is uncoated, meaning it does not have any anti-reflective or other coatings. This can be advantageous in some situations, such as when broadband anti-reflection coatings are not required, or when the window is used in a vacuum environment. However, it's important to note that uncoated windows can have higher reflectivity, which may need to be considered in the system design.