Planar optic hybrid telephoto lens

A telephoto lens assembly configured to image infrared light, said assembly comprising:

• a primary lens sub-assembly including at least one lens, said primary lens sub-assembly being operable to collect and focus light;
• a secondary lens sub-assembly including at least one lens, said secondary lens sub-assembly being operable to collect and focus light from the primary lens sub-assembly;
• and
• a metacorrector positioned relative to the secondary lens sub-assembly and being responsive to the focused light from the secondary lens sub-assembly, said metacorrector including a substrate with a flat surface facing the secondary lens sub-assembly and a flat surface opposite to the secondary lens sub-assembly, said metacorrector further including a metastructure formed in one or both of the surfaces and having concentric spaced apart annuli where each annuli includes spaced apart holes etched into the substrate that correct aberrations in the light, wherein the assembly has a telephoto ratio of less than 0.8, where the telephoto ratio is defined as the ratio of a physical total track length of the assembly to its focal length.

A telephoto lens assembly configured to image infrared light, said assembly comprising:

• a primary lens sub-assembly including at least one lens, said primary lens sub-assembly being operable to collect and focus light;
• a secondary lens sub-assembly including at least one lens, said secondary lens sub-assembly being operable to collect and focus light from the primary lens sub-assembly;
• and
• a metacorrector positioned relative to the secondary lens sub-assembly and being responsive to the focused light from the secondary lens sub-assembly, said metacorrector including a metastructure that is configured to correct aberrations in the light, provide focusing/defocusing power and/or to remove residual secondary color in the light, wherein the assembly has a telephoto ratio of less than 0.45, where the telephoto ratio is defined as the ratio of a physical total track length of the assembly to its focal length.

A telephoto lens assembly comprising:

• a primary lens sub-assembly including at least one lens, said primary lens sub-assembly being operable to collect and focus light;
• a secondary lens sub-assembly including at least one lens, said secondary lens sub-assembly being operable to collect and focus light from the primary lens sub-assembly;
• and
• a metacorrector provided in conjunction with the primary lens sub-assembly, said metacorrector including a metastructure that is configured to correct aberrations in the light, wherein the assembly has a telephoto ratio of less than 0.8, where the telephoto ratio is defined as the ratio of a physical total track length of the assembly to its focal length.