This is a Silicon Flat Window, sourced from Alkor Technologies, with a diameter of 25.4 mm and a thickness of 5 mm. The item is a circular window, designed with a thin lens shape, and is made of silicon material with the material ID "silicon sal vil 1957".
The window is uncoated, making it suitable for applications where coating is not required or preferred. The wavelength of this window is 633 nm, indicating its potential use in monochromatic light applications.
The window's geometry and material make it a versatile option for various optical systems. It is available for purchase through the vendor's website, which is provided in the item data. The link is valid and indicates that the item is in stock, ensuring quick delivery upon order.