Plano-Concave Lens has a negative focal length and is typically used to cause a collimated beam to diverge as in a Galilean type beam expander or Telescope.
Because the spherical aberration of the Plano-Concave is negative, it can be used to balance the aberration of other lenses.
This lens type is widely use in optical display systems, projection optics systems, imaging and laser measurement systems.
Applications:
●Optical Display Systems
●Projection Optics System
●Imaging Optics Systems
●Laser Measurements Systems
| BK7 Plano-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 Plano-Concave Lens Standard Products: | ||||||
| Part No. | f (mm) | φ(mm) | R1(mm) | tc (mm) | te (mm) | fb (mm) |
| -10.0 | 6.0 | 5.180 | 2.0 | 2.9 | -11.3 | |
| -20.0 | 10.0 | 10.370 | 2.0 | 3.2 | -21.3 | |
| -15.0 | 12.7 | 7.780 | 2.0 | 5.3 | -16.3 | |
| -20.0 | 12.7 | 10.370 | 2.0 | 4.1 | -21.3 | |
| -50.0 | 12.7 | 25.920 | 2.0 | 2.8 | -51.3 | |
| -100.0 | 12.7 | 51.83 | 2.0 | 2.3 | -101.3 | |
| -75.0 | 15.0 | 38.87 | 2.0 | 2.7 | -76.3 | |
| -38.1 | 25.4 | 19.763 | 2.0 | 6.5 | -39.4 | |
| -50.0 | 25.4 | 25.920 | 2.0 | 5.3 | -51.3 | |
| -100.0 | 25.4 | 51.83 | 2.0 | 3.6 | -101.3 | |
| -200.0 | 25.4 | 103.66 | 2.0 | 2.7 | -201.3 | |
| -500.0 | 25.4 | 259.15 | 2.0 | 2.3 | -501.3 | |
| -1000.0 | 25.4 | 518.30 | 2.0 | 2.2 | -1001.3 | |
| -100.0 | 30.0 | 51.872 | 2.0 | 4.2 | -101.3 | |
| -200.0 | 30.0 | 103.744 | 2.0 | 3.1 | 201.3 | |
| -50.0 | 38.0 | 25.920 | 3.0 | 11.3 | -52.0 | |
| -100.0 | 38.0 | 51.83 | 3.0 | 6.6 | -102.0 | |
| -200.0 | 38.0 | 103.66 | 3.0 | 4.8 | -202.0 | |
| -500.0 | 38.0 | 259.15 | 3.0 | 3.7 | -502.0 | |
| -700.0 | 38.0 | 362.81 | 3.0 | 3.5 | -702.0 | |
| -50.0 | 40.0 | 25.920 | 2.0 | 11.2 | -51.3 | |
| -75.0 | 50.0 | 38.904 | 2.0 | 11.8 | -77.0 | |
| -100.0 | 50.0 | 51.83 | 3.0 | 9.4 | -102.0 | |
| -200.0 | 50.0 | 103.66 | 3.0 | 6.1 | -202.0 | |
| -500.0 | 50.0 | 259.15 | 3.0 | 4.2 | -502.0 | |
| -800.0 | 50.0 | 414.64 | 3.0 | 3.8 | -802.0 | |
Fused Silica Plano-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 Plano-Concave Lens Standard
| Products: | ||||||
| Part No. | f (mm) | φ(mm) | R1(mm) | tc (mm) | te (mm) | fb (mm) |
| -15.0 | 12.7 | 6.900 | 2.0 | 6.2 | -16.4 | |
| -20.0 | 12.7 | 9.200 | 2.0 | 4.5 | -21.4 | |
| -25.0 | 12. | 11.500 | 2.0 | 3.9 | -26.4 | |
| -30.0 | 12.7 | 13.800 | 2.0 | 3.5 | -31.4 | |
| -40.0 | 12.7 | 18.400 | 2.0 | 3.1 | -41.4 | |
| -50.0 | 25.4 | 23.000 | 2.0 | 5.8 | -51.4 | |
| -100.0 | 25.4 | 46.01 | 2.0 | 3.8 | -101.4 | |
| -200.0 | 25.4 | 92.02 | 2.0 | 2.9 | -201.4 | |
| -500.0 | 25.4 | 230.04 | 2.0 | 2.4 | -501.4 | |
| -1000.0 | 25.4 | 460.08 | 2.0 | 2.2 | -1001.4 | |
| -50.0 | 38.0 | 23.000 | 3.0 | 13.0 | -52.1 | |
| -100.0 | 38.0 | 46.01 | 3.0 | 7.1 | -102.1 | |
| -200.0 | 38.0 | 92.02 | 3.0 | 5.0 | -202.1 | |
| -350.0 | 38.0 | 161.03 | 3.0 | 4.1 | -352.1 |
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.