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DCV022, Uncoated Double-Concave Lenses, H-K9L/N-SF11 Optical Glass, D=25.40mm
- DCV022, Uncoated Double-Concave Lenses, which are available in two materials: N-BK7 and N-SF11.
- This Plano-concave lens with a diameter of 25.40mm, has different focal lengths for you to choose from, f-50mm, f-75mm, f-100mm.
$39.58
| Code | Material | AR Coating | Diameter-mm | Focal Length (EFL-mm) | Radius of Curvature (R1-mm) | Center Thickness (Tc-mm) | Edge Thickness (Te-mm) |
|---|---|---|---|---|---|---|---|
| DCV022-01 | H-K9L (BK7) | Uncoated | 25.4 | -50.0 | -52.01 | 3.0 | 6.1 |
| DCV022-02 | H-K9L (BK7) | Uncoated | 25.4 | -75.0 | -77.86 | 3.5 | 5.6 |
| DCV022-03 | H-K9L (BK7) | Uncoated | 25.4 | -100.0 | -103.69 | 4.0 | 5.6 |
Uncoated Double-Concave Lenses
These uncoated Plano-Concave Lenses are made of BK7 (N-BK7) or N-SF11.
Since the Abbe number of N-SF11 (25.76) is smaller than the Abbe number of N-BK7 (64.17), the lens made of N-SF11 exhibits greater dispersion than the lens made of N-BK7.
- N-BK7: 350-2000nm
- N-SF11: 420-2300nm
Double-Concave Lenses are made of two concave surfaces with same radius, usually used in beam expansion applications, light projection, or focal length of expansion.
Tc---------- Center Thickness
Te---------- Edge Thickness
R1---------- Radius
Dia---------- Diameter
BFL ---------- Back Focal Length
EFL ---------- Effective Focal Length
H'-------------- Principal Point
| 1 | 2 |
|---|---|
| Material | H-K9L |
| Thickness Tolerance | ±0.1mm |
| Surface Accuracy | λ/4 @632.8nm |
| Centering Tolerance | <3 arcmin |
| Bevelling | <0.2×45° |
| 1 | 2 |
|---|---|
| Design Wavelength | 632.8nm |
| Focal Length Tolerance | ±1% |
| Diameter Tolerance | +0.0/-0.1mm |
| Surface Quality | 40-20 |
| Clear Apperture | >90% |
The focal length of the Double-concave lens is negative, which is the best choice for diverging convergent beam.
Similar to Plano-concave lenses, Double-concave lenses can spread a parallel beam to the virtual focus, as in a Galilean beam expander.
Double-Concave Lenses can also be coated with AR Coating
- -A: AR@350-700nm,
- -B: AR@650-1100nm,
- -C: AR@1050-1700nm,
anti-reflection coating can reduce the reflectivity of each surface of the lens.
Uncoated-N-BK7 (10mm Thick Sample)
Uncoated N-SF11 (10mm Thick Sample)
| Weight | 80 g |
|---|---|
| Focal Length | f-50mm, f-75mm, f-100mm |
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