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Location: Main > Optical Lenses > Spherical Bi Concave Lenses > POL-BCV-9-4-F8.2
Name: DIA9.0x4.0mm Bi-Concave Lens(AR1510-1610nm)f-8.2mm
P/N: POL-BCV-9-4-F8.2
Keywords:Dia9.0xTe4.0mm,NBAK4,BCV,EFL-8.2mm,AR@1510-1610nm
Unit Price: S$90.00/pc
Available: In stock
Request: Add to Request List
Introduction:
Bi-Concave lenses have a negative focal length and are best used to diverge a converging beam. Similar to a Plano-Concave lens, a Bi-Concave lens can diverge a collimated beam to a virtual focus as used in a Galilean type beam expander.
But it is usually preferrable to choose a bi-concave lens if the absolute conjugate ratio (object distance divided by image distance) is close to 1. When the desired absolute magnification is either less than 0.2 or greater than 5, the tendency is to choose a plano-concave lens instead.This lens comes with both-side AR coated at C+L bands.
Material: Schott NBAK4 optical glass
Wavelength Range: 350 - 2000nm
Design Wavelength: 1570nm(bi-concave, spherical)
Outer Diameter(OD): 9.00,-0.10/-0.02mm
Center Thickness(Tc): 2.5mm designed
Edge Thickness(Te): 4.0,+/-0.05mm
Radius of Curvature(R1=R2)  9.50,+/-0.05mm
Effective Focal Length(EFL): - 8.20mm designed @ 1570nm
Back Focal Length(BFL): - 9.00mm
Surface Quality: 40/20 scratch and dig
Surface Figure: < lambda/4 @ 633nm inspected (over clear aperture)
 Clear Aperture:  >90%
Centration: <0.05mm
Coating: AR coated @1510-1650,R<0.25% 0-deg AOI(double surfaces)
Bevel:  0.20mm, 40-50 degrees