A240 9.94 mm Dia. D-LAK6 Molded Glass Aspheric Lenses; EFL=8 mm; NA=0.5 Uncoated

The A240 9.94 mm Dia. D-LAK6 Molded Glass Aspheric Lenses are precision-engineered optical components designed for a wide range of applications. These lenses, available from Thorlabs, are molded from D-LAK6 glass, a material known for its excellent optical properties. The lens features an effective focal length (EFL) of 8 mm and a numerical aperture (NA) of 0.5, making it suitable for use in systems where high resolution and light-gathering capability are required.

The lens has a diameter of 9.94 mm and a thickness of 1.15 mm at the edge, ensuring robustness and durability. The center thickness is 3.69 mm, providing structural integrity while minimizing optical distortion. The lens's aspheric design, characterized by radii of curvature of 632.73 mm and -5.48 mm, helps to reduce spherical aberration, a common issue in traditional spherical lenses.

The lens's geometry also includes higher-order aspheric coefficients, which further enhance its optical performance. The front surface coefficients (a2 to a16) are all zero, indicating a high degree of symmetry and precision in the lens's construction. The back surface coefficients (a2 to a8) are non-zero, suggesting that the lens has been specifically designed to correct for aberrations that may arise from the interaction of light with the back surface of the lens.

The lens is uncoated, meaning it does not have any additional layers to enhance its optical properties or protect it from environmental factors. However, this does not affect its performance in many applications, and coated versions are available for situations where additional protection or enhanced optical performance is required.