Lenses spherical
Materials:
- sapphire Al2O3
- germanium Ge
- silicon Si
- calcium fluoride CaF2
- barium fluoride BaF2
- magnesium fluoride MgF2
- zinc selenide ZnSe
- zinc sulfide ZnS
- potassium bromide KBr
- potassium chloride KÑl
- sodium chloride NaCl
- fused silica UV grade
- fused silica visible grade
- glasses: russian, Schott, Ohara
Technical parameters
Diameter: 5-250 mm
|
Parameters |
Achievable accuracy * |
|---|---|
|
Surface Quality, Scratch/Dig |
20/10 |
| Surface Accuracy, Power/Irreg |
0.5/0.1 wave @ 633 nm |
|
TIR, mm |
0.01 |
|
Tolerance for diameter, mm |
0.01 |
|
Tolerance for thickness, mm |
0.01 |
| Focal Length tolerance | 0.5% |
* Determined by the material and parameters.
Aspherical lenses & mirrors
We produce aspherical optics by SPDT machine Nanoform 200 (US) out of materials:
- Optical ceramics (ZnSe, ZnS, MgF2)
- Optical crystals (Ge, Si, CaF2)
- Metals (aluminum and copper alloys, nickel and brass)
- Plastics
Processing of rotationally symmetric, asymmetric surfaces, Fresnel lenses and lens arrays, and also surfaces of free form is also possible.
Maximum deviation of the aspherical surface from the nearest sphere is up to few millimeters.
Surface monitoring is made directly on the machine using the UltraCompTM profiler with sensitivity not less than 10 nm (fig. 1).
Optical surfaces as large as 200 mm can be directly machined.
Reachable optical surface machining parameters of products:
-
Roughness of polished surface – Ra 3-5 nm (fig. 2)
-
Accuracy of form («P-V») – λ/2, λ=633 nm (fig. 3)
Fig. 1 Surface profile.
Fig.2 Roughness, measured by interferometer-profiler.
Fig. 3 Surface interferogram, measured with OptoTL interferometer.
The use of aspherical surfaces allows to produce optical systems with unique properties at minimum size and helps to save expensive infrared materials by reducing the number of optical elements. This is one of the most innovative trends in optical technology.
One of the bright examples is the possibility to manufacture hybrid single germanium lens (instead of two different materials lenses with different dispersion) that combines an aspherical surface with diffractive elements and provides optical system achromatization in the range of 8-14 microns.
Using diamond turning, so-called "flat" lenses can be manufactured – plane-parallel plates with diffractive structure working as lenses, resulting in a substantial reduction in cost and weight of infrared lens objectives.
Reducing the dimensions and weight characteristics while maintaining or even improving image quality through the use of aspherical elements is very important for infrared lens objectives, widely used in aerospace and aviation industries.
We also produce metal (aluminum alloy, copper and brass) aspherical mirrors for telescopic systems.
Non-aspheric lens objective can be re-calculated to a new design, using aspherical and/or diffractive surfaces, and then fabricated.
Domes hemispherical and hyper-hemispherical
Materials:
- sapphire Al2O3
- germanium Ge
- silicon Si
- fused silica UV grade
- fused silica visible grade
Technical parameters
Diameter: 5-250 mm
|
Parameters |
Achievable accuracy * |
|---|---|
|
Surface Quality, Scratch/Dig |
40/20 |
| Surface Accuracy, Power/Irreg |
1/0.25 wave @ 633 nm |
|
TIR, mm |
0.02 |
|
Tolerance for diameter, mm |
0.05 |
|
Tolerance for thickness, mm |
0.05 |
* Determined by the material and parameters.
Lenses cylindrical
Materials:
- sapphire Al2O3
- germanium Ge
- silicon Si
- calcium fluoride CaF2
- barium fluoride BaF2
- magnesium fluoride MgF2
- zinc selenide ZnSe
- zinc sulfide ZnS
- fused silica UV grade
- fused silica visible grade
- glasses: russian, Schott, Ohara
Technical parameters
Size: 10-150 mm
|
Parameters |
Achievable accuracy * |
|---|---|
|
Surface Quality, Scratch/Dig |
40/20 |
| Surface Accuracy, Power/Irreg |
3/1 wave @ 633 nm |
|
TIR, mm |
0.02 |
|
Tolerance for diameter, mm |
0.05 |
|
Tolerance for thickness, mm |
0.05 |
| Focal Length tolerance | 0.5% |
* Determined by the material and parameters.
Windows plano-parallel and wedged
Materials:
- sapphire Al2O3
- germanium Ge
- silicon Si
- calcium fluoride CaF2
- barium fluoride BaF2
- magnesium fluoride MgF2
- zinc selenide ZnSe
- zinc sulfide ZnS
- potassium bromide KBr
- potassium chloride KÑl
- sodium chloride NaCl
- fused silica UV grade
- fused silica visible grade
- glasses: russian, Schott, Ohara
Technical parameters
Diameter: 5-300 mm
|
Parameters |
Achievable accuracy * |
|---|---|
|
Surface Quality, Scratch/Dig |
20/10 |
| Surface Accuracy, Power/Irreg | 0.5/0.1 wave @ 633 nm |
|
Parallelism |
2 sec |
|
Tolerance for diameter, mm |
0.01 |
|
Tolerance for thickness, mm |
0.01 |
* Determined by the material and parameters.
High precise sapphire polishing
Sapphire, due to its unique physical properties, can be used for manufacturing of optical components that work at extreme conditions – high temperature, pressure, mechanical load, aggressive environment and radiation. The quality of polished surface is of great importance for successful application of optical products. Polishing technology that existed earlier and that was characterized by the use of strong etching reagents at chemical-mechanical treatment led to high roughness grade (Ra about 10A), but did not provide high precise surface accuracy, even for plane windows. Products produced by such technology find application in watch industry, electronics, etc., but are not good for precise optical devices.
«Opto-Technological Laboratory» Ltd (Opto-TL) is innovative production enterprise founded in 2002. Main activity – design and manufacturing of optical products.
Quality Management System applied to development, manufacturing and service of optical components out of crystals and glasses, optical systems (including objectives), optical testing and measuring devices corresponds to ISO 9001-2015.
Contact information
Phone: +7 (812) 347-76-90
Fax: +7 (812) 347-76-90
E-mail: sales@optotl.ru
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