Double-Concave Lens, also named Bi-Concave Lens, is used to divergent light.
The Bi-Concave is best used when the input beam is converging.
It is used in beam expanders, Projection optics systems, optical viewers and optical character readers etc.
Applications:
●Beam Expanders
●Projection Optics System
●Imaging Optics Systems
●Optical Viewers
●Optical Character Readers
| BK7 Double-Concave Lens | |
| Specifications: | |
| Material | BK7 grade A optical glass |
| Design Wavelength | 546.1nm |
| Design Index | 1.5183±0.0005 |
| Diameter Tolerance | +0.00/-0.15mm |
| Paraxial Focus Length | ±2% @546.1nm |
| Centration | <3 arc minutes |
| Clear Aperture | >Central 85% of diameter |
| Surface Figure | λ/4@632.8nm |
| Surface Quality | 60-40 S/D |
| Protective Bevel | <0.25mm x 45° |
| BK7 Double-Concave Lens Standard Products: | ||||||
| Part No. | f (mm) | φ(mm) | R1=R2(mm) | tc (mm) | te (mm) | fb (mm) |
| -10.0 | 10.0 | 10.700 | 2.0 | 4.5 | -10.6 | |
| -15.0 | 12.7 | 15.880 | 2.0 | 4.6 | -15.6 | |
| -20.0 | 12.7 | 21.070 | 2.0 | 4.0 | -20.6 | |
| -30.0 | 12.7 | 31.440 | 2.0 | 3.3 | -30.7 | |
| -40.0 | 12.7 | 41.80 | 2.0 | 3.0 | -40.7 | |
| -50.0 | 12.7 | 52.17 | 2.0 | 2.8 | -50.7 | |
| -35.0 | 25.4 | 36.62 | 2.0 | 6.5 | -35.7 | |
| -50.0 | 25.4 | 52.17 | 2.0 | 5.1 | -50.7 | |
| -100.0 | 25.4 | 104.00 | 2.0 | 3.6 | -100.7 | |
| -200.0 | 25.4 | 207.66 | 2.0 | 2.8 | -200.7 | |
| -500.0 | 25.4 | 518.64 | 2.0 | 2.3 | -500.7 | |
| -1000.0 | 25.4 | 1036.94 | 2.0 | 2.2 | -1000.7 | |
| -50.0 | 38.0 | 52.34 | 3.0 | 10.1 | -51.0 | |
| -100.0 | 38.0 | 104.17 | 3.0 | 6.5 | -101.0 | |
| -200.0 | 38.0 | 207.83 | 3.0 | 4.7 | -201.0 | |
| -500.0 | 38.0 | 518.81 | 3.0 | 3.7 | -501.0 | |
| -700.0 | 38.0 | 726.13 | 3.0 | 3.5 | -701.0 | |
| -100.0 | 50.0 | 104.17 | 3.0 | 9.1 | -101.0 | |
| -200.0 | 50.0 | 207.83 | 3.0 | 6.0 | -201.0 | |
| -400.0 | 50.0 | 415.15 | 3.0 | 4.5 | -401.0 | |
| -500.0 | 50.0 | 518.82 | 3.0 | 4.2 | -501.0 | |
| -600.0 | 50.0 | 622.47 | 3.0 | 4.0 | -601.0 | |
| -800.0 | 50.0 | 829.73 | 3.0 | 3.8 | -801.0 | |
Fused Silica Double-Concave Lens
| Specifications: | |
| Material | UV grade fused silica |
| Design Wavelength | 546.1nm |
| Design Index | 1.46008±0.00005 |
| Diameter Tolerance | +0.00/-0.15mm |
| Paraxial Focus Length | ±2% @546.1nm |
| Centration | <3 arc minutes |
| Clear Aperture | >Central 85% of diameter |
| Surface Figure | λ/4@632.8nm |
| Surface Quality | 60-40 S/D |
| Protective Bevel | <0.25mm x 45° |
| Fused Silica Double-Concave Lens Standard Products: | ||||||
| Part No. | f (mm) | φ(mm) | R1=R2(mm) | tc (mm) | te (mm) | fb (mm) |
| -15.0 | 12.7 | 14.110 | 2.0 | 5.0 | -15.7 | |
| -20.0 | 12.7 | 18.710 | 2.0 | 4.2 | -20.7 | |
| -25.0 | 12.7 | 23.320 | 2.0 | 3.7 | -25.7 | |
| -30.0 | 12.7 | 27.920 | 2.0 | 3.5 | -30.7 | |
| -40.0 | 12.7 | 37.12 | 2.0 | 3.1 | -40.7 | |
| -25.0 | 25.4 | 23.320 | 2.0 | 9.5 | -25.7 | |
| -50.0 | 25.4 | 46.32 | 2.0 | 5.6 | -50.7 | |
| -100.0 | 25.4 | 92.33 | 2.0 | 3.8 | -100.7 | |
| -200.0 | 25.4 | 184.35 | 2.0 | 2.9 | -200.7 | |
| -300.0 | 25.4 | 276.36 | 2.0 | 2.6 | -300.7 | |
| -500.0 | 25.4 | 460.40 | 2.0 | 2.4 | -500.7 | |
| -1000.0 | 25.4 | 920.48 | 2.0 | 2.2 | -1000.7 | |
| -50.0 | 38.0 | 46.48 | 3.0 | 11.1 | -51.0 | |
| -100.0 | 38.0 | 92.49 | 3.0 | 6.9 | -101.0 | |
| -150.0 | 38.0 | 138.50 | 3.0 | 5.6 | -151.0 | |
Note:
Cutting Lens, Square Lens, Rectangle Lens and Coatings are available upon request.
Metal Mount is available upon request.
Lenses with material B270, Pyrex, Sapphire, Silicon, Germanium, CaF2, ZnSe etc are also available upon request.
The general tolerance specifications above provide a guideline regarding manufacturing capabilities for optics ranging in size from diameter 0.6-350mm.
The manufacturing limits are not absolute; tighter tolerances may be possible.
Part specific tolerances may vary depending on component size, shape, and/or material.