Though still only in the prototype stage, this flat lens could one day be used on space telescopes, and perhaps even on ...

Curved mirrors, although lighter, can introduce distortions and chromatic aberrations, compromising image quality. Diffractive lenses, such as Fresnel plates, offer a lightweight alternative but ...

For example, Fresnel zone plates (FZPs ... Moreover, distortions created by the secondary mirror or imperfections in the primary mean they have drawbacks of their own, which these diffracting ...

That's why observatory and space-based telescopes rely on massive, curved mirrors instead to achieve ... One existing type, called a Fresnel zone plate (FZP), uses concentric ridges to focus ...

That’s why observatory and space-based telescopes rely on massive, curved mirrors instead to achieve ... One existing type, called a Fresnel zone plate (FZP), uses concentric ridges to focus ...

Curved mirrors, although lighter, can introduce distortions and chromatic aberrations, compromising image quality. Diffractive lenses, such as Fresnel plates, offer a lightweight alternative but ...

For centuries, cameras and telescopes have relied on curved glass or plastic lenses to bend light and bring images into focus. However, the more powerful these lenses need to be, the bigger, heavier, ...