WQK1515-AV2 15 x 15 mm N-BK7 Precision Rectangular Window; t=4mm AR 450-900nm

This is the WQK1515-AV2, a 15 x 15 mm N-BK7 Precision Rectangular Window with a thickness of 4mm, designed for use in the visible spectrum, specifically between 450 and 900nm. This window is sourced from Knight Optical, a reputable vendor known for their high-quality optical components.

The window is made from N-BK7, a popular glass type in the optical industry due to its excellent optical properties and high damage threshold. This material is often used in high-power laser applications and interferometry. The window features a rectangular base shape, making it suitable for a wide range of applications where a flat, transparent surface is required.

The WQK1515-AV2 is coated with Knight Optical's AV2 coating on both the front and back surfaces. This anti-reflection coating is designed to reduce surface reflections, improving transmission and reducing unwanted back reflections. The AV2 coating is specifically designed for the extended visible spectrum, making it ideal for applications where a broad range of wavelengths are used.

The window is thin and lightweight, making it easy to handle and integrate into optical systems. It is classified as a flat window, meaning it does not have any curvature. This makes it suitable for use as a protective window, a beam splitter, or a simple optical interface.