Optical Meniscus Lenses-Meniscus lenses have one concave surface and one convex surface.-Creates a smaller beam diameter, reducing the spherical aberration and beam waste when precision cutting or marking.-Provides a smaller spot size with increased power density at the work piece. Parameters of Meniscus Lenses 1.Material:bk7,b270,glass,fused silica,sapphire,znse,caf2,ge,etc. 2.Dia.2mm to 600mm 3.Surace quality:10/5 to 80/504.flatness;1/4lambda (general standard) 5.CA>85%6.Tol.:+/-0.1(general standard)7.Coating:AR coating,Al,coating,Golded Coating,sliver coating,etc. We will make fast reply,good service,high quality,strict testing,fast delivery for you. Welcome your inquiry!
http://www.nbcameralenses.com/meniscus-lenses/