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What is an Asphere?
An asphere is an optical element with one or more aspheric surfaces – a complex surface with non-constant curvature. These unique geometries have the ability to impart superior performance to optical systems by mitigating spherical aberrations. For imaging systems, aspheres enable clearer, sharper images. Additionally, a single aspheric optic can often be used in place of multiple optical elements, allowing for smaller and lighter systems.
Specifying Aspheric Optics
Specifying an asphere begins with a custom aspheric form, often fit to the Forbes Q Polynomial (Figure 1) or the Even Aspheric Equation (Figure 2).
Describing form involves specifying Vertex Radius (I/C). Conic Constant (k) and applicable Aspheric Coefficients (a). Including a Sag Table (Figure 3) provides reference information to check correct data entry for each manufacturing or metrology tool used. We accept asphere designs from our customers in manufacturing drawing format or by optical design software files (preferably, Zemax).
Our team is well versed in providing manufacturability feedback and providing cost and lead time trade-offs for various tolerancing schemes. If you have a question about your design, don’t hesitate to contact Optimax.
Forbes Q Polynomial
Figure 1
Even Aspheric Equation
Figure 2
Sag Table
Figure 3
Manufacturing Aspheric Lenses
The foundation of our optics manufacturing expertise is the breadth of our metrology knowledge. After all, as the old adage states, “if you can’t measure it, you can’t make it.” Our metrology solutions range from industry-available tools to Optimax-built systems, including custom interferometric test set-ups, stitching interferometry, non-contact and contact profilometers, and high-precision CMM instruments.
A wide range of manufacturing platforms accompany this wide range of metrology tools – again, industry-available and Optimax-built tools for aspheric grinding, polishing, deterministic finishing, and smoothing. This wide range of solutions allows us to provide customers with high-quality, precision aspheres with few limitations.
FIND THE OPTIC SPECIFICATIONS RIGHT FOR YOUR NEEDS:
Manufacturing Limits Manufacturing Tolerances Technology / MetrologyManufacturing the Future
At Optimax, we are manufacturing the future, creating the highest precision optics underlying high-tech systems in key markets and applications. We offer rapid and expedited delivery upon request and are committed to our customers in the long term.
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