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Optical Lenses > Spherical Bi Concave Lenses > POL-BCV-9-4-F8.2
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| 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
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| Available: |
In stock
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| 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. |
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| 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 |  |
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