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ASPHERIC OPTICS |
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The elements of aspheric optics are indispensable for creation of:
- sophisticated telescopes with reflective objective
- precision optical collimators
- spectroradiometers in the range from 0.4 to 15 mm
- other devices and systems
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| Technical Data |
| Substrate material | glass, quartz, sital |
| Clear aperture, mm | up to 800 |
| Shape of surface | paraboloid, hyperboloide, llipsoid, aspherics of order high |
| Ratio of clear aperture to focal length | up to 1/3 |
| Surface curvature, mm | up to 10 |
| Asphericity, mm *) | up to 1000 and above |
| Surface accuracy *) | λ/10 (at λ=0.63 µm) |
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*) the maximum asphericity and accuracy vary with the surface parameters and the material properties.
OFF-AXIS PARABOLOIDS
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Precision aspherics, among them off-axis concave parabolic mirrors are widely accepted by a customer.
Over many years the manufacturing process of the off-axis paraboloids have been improved. At present the exacting specifications
for our products can be satisfied in the shortest possible time and at a competitive price. |
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| Wedge-shaped (W) OAP |
OAP with uniform thickness (U) |
| TECHNICAL DATA and TOLERANCES |
| Focal length | ±0.5% |
| Off-axis distance |
diameter up to 100 mm | ±1 |
diameter above 200 mm | ±3 |
| Clear aperture | 95% of diameter |
| Surface accuracy (P-V) at a wavelength of 0.6328 µm: |
Mirror aperture up to äî f/6 | λ/8 |
Mirror aperture up to äî f/3 | λ/4 |
Mirror aperture above f/3 | as agreed with a customer |
| Diameter | +0 -0.2 |
| Thickness | ±0.25 |
| Chamfers | 1 mm õ 45o |
| Material | low-expansion glasses, fused quartz, sital |
| Reflecting coating | protected aluminium |
| Surface quality | 60/40 with the MIL-0-1383 specifications |
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The off-axis mirrors are mainly made of billets. Because of this a customer may select either a wedge-shaped (W) or a uniform-thickness (U) mirror (see Figs.) to fit the given design.
The parabolic mirrors are tested with a laser unequal-path interferometer employing the autocollimating scheme. These interferometers are characterized by high sensitivity because of the double reflection from the mirror under control.
Surface accuracy is certified by the interferogram and the computer-reduced calculations of the interferometric data. The spectral reflectance curve and the coating description are also given in a certificate.
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TECHNICAL DATA
This table includes the most popular models of the off-axis paraboloids to be delivered in the shortest possible time
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| Mirror shape |
Diameter |
Focal length |
Off-axis distance |
Thickness of(outer) edge |
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inch |
mm |
inch |
mm |
inch |
mm |
inch |
mm |
| W,U |
2.4 |
60.96 |
12 |
304.8 |
2.067 |
52.5 |
1.4 |
35.56 |
| W,U |
2.75 |
69.85 |
20 |
508 |
1.7 |
43.18 |
0.98 |
24.89 |
| W,U |
5 |
127 |
40 |
1016 |
5.12 |
130 |
0.8 |
20.32 |
| W,U |
7.5 |
190.5 |
40 |
1016 |
5.15 |
130 |
0.8 |
20.32 |
| W,U |
8 |
203.2 |
40 |
1016 |
5.15 |
130 |
0.8 |
20.32 |
| W,U |
8.5 |
215.9 |
40 |
1016 |
6.299 |
160 |
1.5 |
38.1 |
| W |
10 |
254 |
20 |
508 |
7.087 |
180 |
2.8 |
71.12 |
| W,U |
10.5 |
266.7 |
70 |
1178 |
9.5 |
241.3 |
1.5 |
38.1 |
| W,U |
12 |
304.8 |
40 |
1016 |
7 |
177.8 |
2.2 |
55.88 |
| U,W |
13 |
330.2 |
70 |
1778 |
10 |
254 |
2.5 |
63.5 |
| U,W |
15 |
381 |
70 |
1778 |
10 |
254 |
2.5 |
63.5 |
Engineering information:
E-mail: market@niiki.ru
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