520nm long-distance collimating lens

The fiber output can be collimated and shaped for different laser outputs from fiber connections, providing diffraction-limited performance at the designed wavelength with collimation distances up to 200 meters. The design of this series of collimating lenses is compact and unaffected by misalignment. During design, image aberration correction is applied, and a double-lens series with air spacing is chosen for excellent collimation performance. The effective focal length of the double-lens is wavelength-dependent. Therefore, this series of collimating lenses should be used at the designed wavelength for optimal performance.