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Plano-convex and biconvex lenses are the two most common positive (converging) lens shapes. Both bend parallel light rays to a focus; the difference is that a plano-convex lens has only one curved surface, while a biconvex lens has two. Key Specifications at a Glance Parameter Typical Value Substrate N-BK7, UV fused silica...

An aspheric lens has a surface curvature that changes continuously from the center to the edge, instead of staying constant like a spherical lens. That extra design freedom lets a single aspheric element correct aberrations that would otherwise take several spherical lenses to fix. Key Specifications at a Glance Parameter Typical Value...

An optical mirror reflects light using a coated surface rather than refraction, which makes it useful anywhere a lens's chromatic aberration or transmission loss would get in the way. Choosing the right one comes down to two decisions: what surface shape you need, and what coating will reflect your wavelength efficiently. Key...