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Asphere Design & Manufacturing |
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Why Asphere?
Aspherical elements eliminate monochromatic aberrations (e.g. spherical aberration) and improve focusing and collimating accuracy. They replace a multiple spherical element assembly, thereby combining weight reduction and a more compact design. Thus the number of back reflections is reduced, and a higher transmission is achieved.
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| I) Molding |
Shanghai Optics has identified plastic and several glasses that are suitable for precision molding due to their low transformation temperatures. Acrylic, Plastic, BK-7, B270, Pyrex, Borosilicate, F2 etc. |
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| Please contact us for your desired shape. Our engineering team will be happy to support you in making your aspherical lens design moldable. |
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| Key Features |
- Form error: ≤ 5 fringes (sph. side)
- Form error: ≤ 5 µm PV (asph. side)
- Irregularity: ≤ 2 fringes (sph. side)
- Tilt: ≤ 2´
- Surface roughness: < 1 nm rms
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| II) Traditional Polishing |
The many challenges that optics manufacturers have had to overcome while polishing glass aspheric surfaces have left designers with little confidence that precision glass aspheres can be production volume, within specification, within budget and on time.
Over the past decade our maturing understanding of technology and process has lead to the emergence of “new tools” which make it possible for us to routinely produce a wide variety of complex glass aspheres. At Shanghai Optics we pride ourselves in the ability to produce affordable high precision glass aspheres that give our customers a competitive advantage.
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Over the past decade our maturing understanding of technology and process has lead to the emergence of “new tools” which make it possible for us to routinely produce a wide variety of complex glass aspheres. At Shanghai Optics we pride ourselves in the ability to produce affordable high precision glass aspheres that give our customers a competitive advantage.
Diameter : from under 10 mm to over 300 mm
Maximal aspheric deviation from best-fit-sphere: from a few waves to a few millimeters
Maximal PV of surface from error: from under 1/10 wave to a few waves |
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| Optical Glass Asphere |
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| Key Features |
 Substrate Material: BK-7, B270, Pyrex, Borosilicate, F2 etc |
| Form error: ≤ 5 fringes (sph. side); ≤ 5 µm PV (asph. side) |
| Irregularity: ≤ 2 fringes (sph. side) |
| Tilt: ≤ 2´ |
| Surface roughness: < 1 nm rms |
| Lens diameter: 5 to 120 mm |
| Lens thickness: 2 to 10 mm |
| Radii / pole radii Concave 20 to 250 mm |
| Radii / pole radii Convex 20 to 250 mm |
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| Infrared Material Asphere |
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| Key Features |
| Substrate Material: Si, Ge, ZnSe, ZnS and more |
| Surface Quality: 20-10(after coating) |
| Surface figure: l/4 @ 633nm |
| Angle: +/-5" |
| Clear Aperture: >85% of central dimension |
| Antireflection Coating: @ 3-12 um |
| Lens diameter: 5 to 120 mm |
| Lens thickness: 2 to 10 mm |
| Radii / pole radii Concave 20 to 250 mm |
| Radii / pole radii Convex 20 to 250 mm |
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| Our trademark discounts for OEM-quantity orders are no secret! Please contact us and see how competitive we can be. |
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