Plano concave lens is mainly used in diverging parallel light. BK7 materialhas 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.

Material: BK7

Design Wavelength: 587.6nm

Diameter Tolerance: +0.0/-0.1mm

Center Thickness Tolerance: ±0.1mm

Surface Figure: λ/4 @633nm

Focal Length Tolerance: ±1%

Centration: 3 arc min.

Surface Quality: 40/20(Dia≤25.4mm),

60/40(Dia>25.4mm)

Bevel: 0.3×45°(Dia≤50.8mm),

0.4×45°(Dia>50.8mm)

Coating: Customized