355nm,532nm,1064nm,BK7,K9,Quartz crescent lens
A crescent lens, also known as a concave convex lens, can reduce the spherical aberration and produce the minimum straight incident light focus. It is based on the relative curvature of two surfaces, and can be a positive or negative lens. The center of a negative meniscus lens is thinner than its periphery, while the center of a positive meniscus lens is thicker than its periphery.
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