- Lenses have many applications ranging from the simple collection of a laser beam to precision imaging and image transfer. Lenses are classified as single lenses, cylindrical lenses and achromatic lens..
Lens
Single Lens
Description
Lenses have many applications ranging from the simple collection of a laser beam to precision imaging and image transfer. Lenses are classified as single lenses, cylindrical lenses and achromatic lenses. These lenses are made of BK7, fused silica and CaF2. Special focusing systems can be designed by our engineers upon request.
| LENSES | MATERIALS | ILLUSTRATION | PROPERTIES AND APPLICATIONS |
|---|---|---|---|
|
PLANO-CONVEX LENS |
BK7 Fused Silica Sapphire CaF2 |
|
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 |
|
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 |
|
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 |
|
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 |
|
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 |
|
These lenses may be used to increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations. |
|
CYLINDRICAL LENS |
BK7 Fused Silica |
|
Used to provide focusing power in one section only. For illumination or detection of light from line sources. Also used for anamorphic compression of beams and images. |
|
ACHROMATIC LENS |
Combinations of Two Optical Grade Glasses |
|
These lenses have considerably reduced values of spherical aberrations. Best used to replace single components where performance must be improved. |
| sPECIFICATIONS | COMMERCIAL | HIGH PRECISION |
|---|---|---|
|
MATERIAL |
Schott N-BK7, Chengdu 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 |