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https://www.ecoptik.net/products/plano-convex-l-lens/

Plano-convex L lenses/Mirrors are positive focal length elements that have one spherical surface and one flat surface. These lenses are designed for infinite conjugate (parallel light) use or simple imaging in non-critical applications. The use of a plano convex lens/mirror is ideal for all-purpose focusing elements.
If you want to know more information about a plano-convex lens/mirror, such as the use and refractive index of a plane convex lens, please contact us.

Description Of Plano Convex L Lens
Ecoptik Manufactures Plano Convex Lens. 
The use of plano-convex cylindrical lenses: The plano-convex rectangular cylindrical lens can provide positive or negative focal length, which is very suitable for laser line generation or deformed beam shaping. It can be single-axis magnified in various optical applications to make the laser output circular. These plano-convex cylindrical lenses can be combined with other lenses to form a composite imaging system.

Specifications Of Plano Convex L Lens

MaterialOptical grade glass/ Fused Silica/ Sapphire
Diameter2mm~300mm
Diameter Tolerance±0.05mm~±1mm
Surface Quality80/50, 60/40,   40/20, 20/10, 10/5
Surface Accuracyλ~λ/20
Centration3 arc min~30   arc sec.
CoatingAs per customer's   request

Ecoptik (also known as BRD Optical) as one of the best optical components companies was founded in 2004, and is located in the city of Changchun-the optic base of China with a beautiful view and profound optical culture.