Components


Lenses spherical

Materials:

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)


cat1.jpg

Fig. 1 Surface profile.



cat2.jpg

Fig.2  Roughness, measured by interferometer-profiler.

cat3.jpg

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:

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:

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

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.