HO-PXL25-1.6 25mm Dia. N-BK7 Plano-Convex Lens; EFL=40mm Uncoated

This is a Plano-Convex lens from Holmarc Opto-Mechatronics, a leading manufacturer of optical components. The lens, identified as HO-PXL25-1.6, has a diameter of 25mm and a thickness of 2mm at the edge. It is made of N-BK7, a popular glass type in the optical industry, known for its excellent optical properties and high damage threshold.

The lens has an effective focal length (EFL) of 40mm, which is the distance from the lens's center to the focal point when the lens is placed in an optical system. The curvature of the lens is defined by a radius of 20.865mm, which is the radius of the curvature of the lens surface. The lens's inner and outer radii are both zero, indicating that the lens is a simple plano-convex design.

The lens is uncoated, meaning it does not have any anti-reflective coatings. While uncoated lenses can be more affordable, they may suffer from increased reflection, which can lead to a loss of light in the system. However, uncoated lenses can be beneficial in certain applications where the user wants to introduce a known amount of reflection.

The lens is designed for use at a wavelength of 587.6nm, which is in the yellow-green part of the visible light spectrum. This makes it suitable for applications that use light in this wavelength range, such as fluorescence microscopy or certain types of laser systems.