22-940 25mm Dia. N-SF6 Precision NIR Aspheric Lens; EFL=50mm; NA=0.25 Laser V-Coat 1550nm

The 22-940 is a high-precision NIR (Near-InfraRed) Aspheric Lens, designed and manufactured by Edmund Optics. This lens is specifically engineered for use with a wavelength of 1550nm, making it ideal for applications in the near-infrared spectrum.

The lens boasts a base shape of a circle, with a diameter of 25mm, and a thickness of 6.43mm at the edge. The effective focal length (EFL) of this lens is 50mm, and it has a numerical aperture (NA) of 0.25. The lens is made from N-SF6 Schott, a high-quality optical glass known for its excellent transmission properties in the near-infrared region.

The 22-940 features an advanced laser V-coat, designed for use with a wavelength of 1550nm. This coating enhances the lens's performance by reducing surface reflections and increasing transmission. The coating is applied to both the front and back surfaces of the lens.

The lens's geometry is defined by several key parameters. The inner radius is 0mm, while the outer radius is also 0mm. The front surface of the lens has a radius of curvature (R1) of 8.58mm, while the back surface (R2) is flat. The back focal length (BFL) is 42.65mm, and the thickness at the center of the lens is 8.5mm.

The lens's shape is aspheric, which means it has a non-spherical surface. This design allows for superior optical performance, particularly in terms of reducing spherical aberration. The aspheric shape is defined by a conic constant (k1) of -1.009, and higher-order aspheric terms (k2, k3, etc.) are all 0.