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BK7 Double-Concave Lenses
Double concave lens(DCV) is similar with plano concave lens. The focus length is negative. It can make parallel light diverge outside. The two sides have same radius of curvature. Double convex lens generally used for expanding beam of light and projection etc. BK7 double concave lens has excellent transmittance from visible to near infrared wavelength (350-2000nm).
BK7 Plano-Concave Lenses
BK7 Plano concave lens(PCV) is mainly used in diverging parallel light. BK7 material has high transmittance from visible light to near infrared(350-2000nm). When don’t need the feature of uv silica material, often use this type in laser and telescope application.
UV Grade Fused Silica Plano Concave Lenses
UV fused silica material plano concave (PCV) has high transmittance in ultraviolet to infrared wavelength(185-2100nm) especially in deep ultraviolet region. This type plano concave lens is widely used in high power laser and imaging system.
UV Grade Fused Silica Plano Convex lenses
Plano convex lens(PCX) is mainly used in focusing parallel light or transfer spot light to parallel light. Fused silica Plano convex lens has high transmittance from ultraviolet to near infrared(185-2100nm) and lower coefficient of thermal expansion.