ACN127-020-A In Stock

The ACN127-020-A by ThorLabs is a top-performing, cemented achromatic doublet that has been engineered to deliver exceptional performance in the visible region. This lens is unmounted and optimized to operate within the 400 nm - 700 nm range, making it ideal for a wide range of optical applications. One of the standout features of the ACN127-020-A is its AR coating, which has been specially designed to operate with the helium "d" yellow line (587.6 nm) and the hydrogen blue/green "F" (486.1 nm) and "C" red (656.3 nm) lines. These wavelengths represent the visible spectrum and are used to define a material’s Abbe Number.

The ACN127-020-A boasts a negative focal length of -20 mm and has a size of Ø1/2. It is worth noting that the side of the ACN127-020-A with the largest radius of curvature should face away from the collimated beam. It's essential to keep in mind that a positive radius of curvature indicates that the surface is opening to the right when the lens is oriented in a specific direction while a negative radius of curvature indicates that the surface is opening to the left. Both the positive and negative lenses have an infinite conjugate ratio. For instance, if placed one focal length away from the lens flatter side, light rays emerging from a diverging light source will be collimated.