The CaF2-W-38.1x4 is a flat window type optical element, sourced from Alkor Technologies, with a circular base shape and a diameter of 38.1 mm. This window has a thickness of 4 mm and is made of Calcium Fluoride (CaF2) with the material ID "caf2 mal-1963".
The window is designed to operate at a wavelength of 633 nm and features a thin lens shape. It is uncoated, which means it does not have any additional layers to enhance or alter its optical properties.
For more information about this product, you can refer to the vendor's website through the provided weblink: 'http://www.alkor.net/CaF2_windows.html'. The weblink status is 'Valid - in stock', indicating that the product is available for purchase.