20QB20 50.8 mm Dia. UVFS Interferometer Optical Flat Window; t=12.7 mm Uncoated

The 20QB20 is a high-quality optical flat window designed for use in interferometry applications. This component, sourced from the reputable vendor MKS/Newport, boasts a diameter of 50.8 mm and a thickness of 12.7 mm, making it a robust and reliable choice for a variety of optical setups.

The window is made from UVFS material, specifically identified as UVFS Mal-1965, which is known for its excellent optical properties. This material is particularly suitable for use in the visible spectrum, with a specified wavelength of 632.8 nm. The base shape of the window is circular, a common and versatile choice for many optical systems.

The 20QB20 is designed in the shape of a thin lens, which helps to minimize optical aberrations and distortions. This is particularly beneficial in interferometry applications, where precise optical path lengths and phase relationships are critical.

Notably, this particular model is uncoated. While coatings can be beneficial in many applications, an uncoated window can be advantageous in certain situations. For instance, it can reduce reflection losses and simplify the optical design. However, it may also be more susceptible to environmental factors such as dust and moisture, so careful handling and cleaning procedures may be required.