This is a Flat Window type optical component from Holmarc Opto-Mechatronics with a base shape of Rectangular. The window has dimensions of 10 x 20 mm and a thickness of 5 mm. The material used for this window is N-BK7 Schott, a popular choice for its excellent optical properties.
The window is coated with BBAR (Broadband Anti-Reflection) coating on both the front and back surfaces, optimized for a wavelength of 632.8 nm. This coating enhances the transmission of light through the window by reducing reflection, thereby improving the overall efficiency of the optical system.
The shape of this window is Thin Lens, suggesting that it may have some light bending properties, although the specific curvature or refractive index is not provided in the item data.
According to the vendor's website, this item is currently in stock, and more information can be found at https://www.holmarc.com/windows_rectangular.php.