Double Concave Lenses are used in beam expansion, image reduction, or light projection applications. These lenses are also ideal for expanding the focal length of an optical system. Double Concave Lenses, which have two concave surfaces, are Optical Lenses with negative focal lengths. Betensh Optics offers Double Concave lenses with a variety of coating options.
Material :
Optical glass, Fused silica, Silicon, Germanium, CaF2, MgF2, Sapphire, ZnSe, ZnSSurface Quality :
10-5Coating :
Uncoated, AR and HRDiameter :
0.5 to 350 mmDiameter Tolerance :
+0/-0.02 mmThickness Tolerance :
±0.01 mmSurface Figure :
λ/10Centration :
1 minute or 30 Second1. What is Biconcave lens?
Double Concave lenses(biconcave lens) are manufactured with two concave surfaces to provide a negative focal length. The lens is also called a negative or diverging lens.
2.What is biconcave lens used for?
These lenses are normally used in applications that require to expand light beams or to increase focal lengths. Such as Beam Expanders, Projection lenses, viewers, Medical Ophthalmic Detection... and so on.
3. what can Betensh Optics do?
Specification:
|
Material |
BK7 or Fused Silica |
|
Design Wavelength |
546.1 nm |
|
Design Index: |
|
|
BK7 |
1.5183 ± 0.0005 |
|
Fused Silica |
1.46008±0.00005 |
|
Diameter Tolerance |
+0.00, -0.15 mm |
|
Thickness Tolerance |
±0.2 mm |
|
Paraxial Focal Length |
±2% |
|
Centration |
<3 arc minutes |
|
Clear Aperture |
>85% |
|
Surface Irregularity |
λ/4@632.8 nm |
|
Surface Quality |
60-40 scratch and dig |
|
Protective Bevel |
0.25 mm x 45° |
BK7 Double-Concave Lens Standard Products:
|
Part No. |
f (mm) |
Ф (mm) |
R1=R2(mm) |
t c(mm) |
t e(mm) |
f b(mm) |
|
TDE201 |
-10.0 |
10 |
10.70 |
2.0 |
4.5 |
-10.6 |
|
TDE202 |
-20.0 |
12.7 |
21.07 |
2.0 |
4.0 |
-20.6 |
|
TDE203 |
-50.0 |
12.7 |
52.17 |
2.0 |
2.8 |
-50.7 |
|
TDE204 |
-100.0 |
25.4 |
104.0 |
2.0 |
3.6 |
-100.7 |
Note: Other material, size and coating are available upon request.
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Details
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Details
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Details
Double Concave Lenses are used in beam expansion, image reduction, or light projection applications. These lenses are also ideal for expanding the focal length of an optical system. Double Concave Lenses, which have two concave surfaces, are Optical Lenses with negative focal lengths. Betensh Optics offers Double Concave lenses with a variety of coating options.
Details
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