67-595 4.5mm Dia. x 9mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

The 67-595 is a high-quality double-convex lens, boasting a 4.5mm diameter and a focal length of 9mm, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use within the near-infrared (NIR) spectrum, covering the wavelength range of 750-1550nm, making it an ideal choice for applications requiring superior performance in this spectral region.

The lens features a sophisticated NIR II coating on both its front and back surfaces, ensuring optimal transmission and minimal reflection across the NIR spectrum. This coating is applied using Edmund Optics' standard curve, further enhancing the lens' performance and reliability.

The 67-595's geometry is another notable feature. It has an edge thickness of 1.8mm and a center thickness of 2.38mm, providing excellent structural integrity. The lens's effective focal length (EFL) is 9mm, and its front and back radii are 8.88mm and -8.88mm, respectively. The back focal length (BFL) is 8.16mm, and both the inner and outer radii are 0mm, indicating a purely spherical lens shape.

The lens is made from n-BK7 Schott, a widely used optical glass known for its excellent optical properties and versatility. This material, combined with the lens's double-convex design, ensures high-quality imaging and minimal aberrations.