A plano-concave lens is a type of lens with a negative focal length, featuring one flat surface and one concave surface. It is typically used to diverge light beams. The lens is thinner in the middle than at the edges, causing light rays to diverge as they pass through, rather than converging as they would with a convex lens.
The main characteristic of a plano-concave lens is its negative focal length, which makes it primarily used for beam collimation, increasing or decreasing focal length, and expanding or reducing images. To minimize spherical aberration, coma, and astigmatism, plano-concave lenses are often employed in high-energy laser systems to reduce the likelihood of residual reflected light converging from the surface.
Plano-concave lenses are commonly used for beam expansion, projection, and increasing the focal length of optical systems. Depending on specific requirements, plano-concave lenses can be provided with or without anti-reflective coatings, making them suitable for visible light, near-infrared light, and specific wavelength applications. For example, fused silica is suitable for ultraviolet applications, while single-crystal calcium fluoride is ideal for certain wavelength applications.
Specifications | Commercial spec. | High precision spec. |
Material | UV glass (quartz, fused silica) | |
VIS glass (Schott, CDGM, HOYA, etc.) | ||
Diameter | Ø5mm~Ø600mm | |
Diameter tolerance | ±0.1mm | ±0.05mm |
Focal length tolerance | ±2% | ±1% |
Surface quality | 60/40 | 40/20 |
Centration | < 3 arc min | <1arc min |
Surface figure | 3λ | 2λ |
Surface irregularity | 1/4λ | 1/10λ |
Clear aperture | >85% of dia | >90% of dia |
Bevel | <0.2mm x 45deg | <0.1mm x 45deg |
Coating | Up on clients’ request | |
Type No. | Diameter | Focal length | Edge thickness | Center thickness | Back focal length | Radius of curvature |
φD( mm) | f( mm) | Te( mm) | Tc( mm) | fb( mm) | r( mm) | |
BK7-6-6 | 6 | -6 | 5.5 | 2.0 | -7.37 | 3.11 |
BK7-6-12 | 6 | -12 | 4.2 | 2.0 | -13.3 | 6.22 |
BK7-10-15 | 10 | -15 | 3.5 | 2.0 | -16.3 | 7.79 |
BK7-10-20 | 10 | -20 | 3.3 | 2.0 | -2.3 | 10.38 |
BK7-10-30 | 10 | -30 | 2.8 | 2.0 | -31.3 | 15.57 |
BK7-12.7-15 | 12.7 | -15 | 5.3 | 2.0 | -16.3 | 7.79 |
BK7-12.7-20 | 12.7 | -20 | 4.2 | 2.0 | -21.3 | 10.38 |
BK7-12.7-25 | 12.7 | -25 | 3.7 | 2.0 | -26.3 | 12.98 |
BK7-12.7-30 | 12.7 | -30 | 3.4 | 2.0 | -31.3 | 15.57 |
BK7-15-30 | 15 | -30 | 3.9 | 2.0 | -31.3 | 15.57 |
BK7-20-30 | 20 | -30 | 5.6 | 2.0 | -31.3 | 15.57 |
BK7-20-50 | 20 | -50 | 4.0 | 2.0 | -51.3 | 25.95 |
BK7-25.4-30 | 25.4 | -30 | 8.6 | 2.0 | -31.3 | 15.57 |
BK7-25.4-50 | 25.4 | -50 | 5.3 | 2.0 | -51.3 | 25.95 |
BK7-25.4-100 | 25.4 | -100 | 3.6 | 2.0 | -101.3 | 51.90 |
BK7-25.4-300 | 25.4 | -300 | 2.6 | 2.0 | -301.3 | 155.70 |
BK7-25.4-1000 | 25.4 | -1000 | 2.1 | 2.0 | -1001.3 | 502.4 |
BK7-30-40 | 30 | -40 | 8.4 | 2.0 | -41.3 | 18.40 |
BK7-30-60 | 30 | -60 | 5.9 | 2.0 | -61.3 | 27.60 |
BK7-30-100 | 30 | -100 | 4.2 | 2.0 | -101.3 | 46.00 |
BK7-40-50 | 40 | -50 | 11.4 | 2.0 | -51.3 | 23.00 |
BK7-40-60 | 40 | -60 | 8.0 | 2.0 | -71.3 | 27.60 |
BK7-50-70 | 50 | -70 | 13.0 | 3.0 | -72.0 | 32.20 |
BK7-50-80 | 50 | -80 | 11.4 | 3.0 | -82.0 | 36.80 |
BK7-50-100 | 50 | -100 | 9.4 | 3.0 | -102.0 | 46.00 |
BK7-50.8-70 | 50.8 | -70 | 15.4 | 3.0 | -72.1 | 32.20 |
BK7-50.8-80 | 50.8 | -80 | 13.4 | 3.0 | -82.0 | 36.80 |
BK7-50.8-100 | 50.8 | -100 | 10.6 | 3.0 | -102.0 | 46.00 |
Type No. | Diameter | Focal length | Edge thickness | Center thickness | Back focal length | Radius of curvature |
φD( mm) | f( mm) | Te( mm) | Tc( mm) | fb( mm) | r( mm) | |
JGS1-10-15 | 10 | -15 | 4.1 | 2.0 | -16.4 | 6.90 |
JGS1-10-20 | 10 | -20 | 3.5 | 2.0 | -21.4 | 9.20 |
JGS1-10-30 | 10 | -30 | 2.9 | 2.0 | -31.4 | 13.80 |
JGS1-12.7-15 | 12.7 | -15 | 5.9 | 2.0 | -16.4 | 6..90 |
JGS1-12.7-20 | 12.7 | -20 | 4.2 | 2.0 | -21.4 | 9.20 |
JGS1-12.7-25.4 | 12.7 | -25.4 | 4.9 | 2.0 | -27.2 | 11.90 |
JGS1-20-30 | 20 | -30 | 6.3 | 2.0 | 31.4 | 13.80 |
JGS1-20-50 | 20 | -50 | 4.3 | 2.0 | -51.4 | 23.00 |
JGS1-20-100 | 20 | -100 | 3.1 | 2.0 | -101.4 | 46.00 |
JGS1-20-150 | 20 | -150 | 2.7 | 2.0 | -151.4 | 69.00 |
JGS1-25-50 | 25 | -50 | 5.7 | 2.0 | -51.4 | 23.00 |
JGS1-25-80 | 25 | -80 | 4.2 | 2.0 | -81.4 | 36.80 |
JGS1-25-100 | 25 | -100 | 3.7 | 2.0 | -101.4 | 46.00 |
JGS1-25.4-30 | 25.4 | -30 | 10.4 | 2.0 | -11.4 | 13.80 |
JGS1-25.4-200 | 25.4 | -200 | 2.88 | 2.0 | -201.4 | 92.00 |
JGS1-25.4-400 | 25.4 | -400 | 2.44 | 2.0 | -401.3 | 184.00 |
JGS1-25.4-1000 | 25.4 | -1000 | 2.05 | 2.0 | -1001.3 | 460.00 |
JGS1-50-100 | 50 | -100 | 3.0 | 10.4 | -92.8 | 46.00 |
JGS1-50-400 | 50 | -400 | 3.0 | 4.7 | -396.7 | 184.00 |
English
русский
