Spherical lenses are utilized for beam focusing and collimation. Our precision lenses begin with optical materials designed to achieve high transmittance across the desired spectral range. Great care is taken in crafting lens shapes with exceptional surface accuracy and quality. Spherical lenses can be categorized as plano-concave, plano-convex, double concave, double convex, meniscus, achromatic (doublet), rod, ball and core lenses based on their unique characteristics.
LENSE TYPE | MATERIALS | ILLUSTRATION | PROPERTIES AND APPLICATIONS |
Plano-Convex Lens | BK7/ Fused Silica/ Sapphire CaF2/other optical glass |
| Positive focus length. Most suitable where one conjugate is more than five times the other, e.g. in sensor applications or for use with near-collimated light. Also where both conjugates are on the same side of the lens, e.g. as an add-on lens to increase the numerical aperture. |
Double-Convex Lens | BK7/ Fused Silica/ Sapphire CaF2/other optical glass |
| Most suitable where the conjugates are on opposite sides of the lenses and the ratio of the distances is less than 5:1, e.g. as simple image relay components. |
Plano-Concave Lens | BK7/ Fused Silica/ Sapphire CaF2/other optical glass |
| A negative lens with the form most suitable where one conjugate is more than five times the other, e.g. producing divergent light from a collimated input beam. |
Double-Concave Lens | BK7/ Fused Silica/ Sapphire CaF2/other optical glass |
| A negative lens with the form most suitable to producing divergent light or a virtual image, where the input light is converging. |
Positive Meniscus Lens | BK7/ Fused Silica/ Sapphire CaF2/other optical glass |
| These lenses may be used to increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations. |
Negative Meniscus Lens | BK7/ Fused Silica/ Sapphire CaF2/other optical glass |
| These lenses may be used to increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations. |
Mount For Lenses | Black Anodized Aluminum |
| Used to fix the position of lenses. |
GENERAL | HIGH PRECISION | |
Material | N-BK7, CDGM H-K9L, Fused silica, CaF2, Sapphire | |
Design wavelength | 546.07nm | |
Design index (bk7) | 1.51680 for BK7, 1.45846 for Fused Silica | |
Diameter tolerance | +0.0, 0.15mm | +0.0, 0.05mm |
Paraxial focal length | ±2% | ±0.5% |
Centration | <3' | <1' |
Clear aperture | 80% | 90% |
Surface quality | 60-40 scratch and dig | 10-5 scratch and dig |
Surface irregularity | < λ/4 | < λ/8 |
Protective bevel | 0.25 + 0.25, -0.0mm | 0.2 ± 0.1mm |
