This is the 05Q20RAR.S, a 12.7 mm diameter UVFS antireflection o-Texture surface parallel optical flat window, with a thickness of 3.18 mm, specifically designed for the wavelength of 632.8 nm. This product is sourced from the reputable vendor, MKS/Newport.
The window is a circular flat window, designed with a thin lens shape. It is made from UVFS material, identified as "uvfs mal- 1965" in the Material ID. The window features a unique antireflection coating on both the front and back surfaces, specifically the "new rarsar250550" coating. This coating is designed to operate within the wavelength range of 250-550nm.
According to the provided item data, the product is currently in stock and available for purchase. The product's webpage can be accessed through the following link: https://www.newport.com/p/05Q20RAR.S. This link provides further details about the product, including its specifications, pricing, and availability.