Due to the more complex surface profile of asphere which significantly reduces or eliminate optical aberrations as compared to the simple lens, Aspheric lenses have at least one surface that is not a true sphere,It has been more widely exploited in the lens optical design stage.
At Spoptic, we are equipped with Optotech asphere machine which offers our customers with contour deterministic micro grinding (CDMG) service, uses the accuracy and repeatability of a computer numerically controlled machine to grind the optical shape. We start by grinding the best-fit sphere to remove the bulk material and contour the aspheric shape into the optical material from edge to center. Typical materials available of our fabrication capability are optical glass, ZnSe, ZnS, BaF2, GaAs, and chalcogenide glass. We also accept materials supplied by customers.
Optical Machining Centers capability:
Following such manufacturing procedure, there is no extra investment on tooling and processing fixtures for sphere substrates and preparation， contributes customers a quick and productive start to the schedule. With the asphere part ground, the profilemeter measure will be conducted and transfer measured data to the polisher. In our polishing process, our experienced operators can control the asphere form error within 1 micron (Depends on the diameter of the parts).
Spoptic values every single opportunity offered by customers; our typical MOQ is two pieces for optical performance approval purpose at customers’ end; Our fast asphere prototyping has become one of our most popular services for customer low ratio initial production LRIP projects. We can process both sphere and asphere parts at the same time for customer’s objective or eyepiece design, which secures a reliable timeline management to meet LRIP tight timing requirement. Meanwhile, we also provide coating package with competitive pricing serving this rapid prototyping concept.
Our rapid aspheric prototyping / LRIP service including:
1.When Off-the-shelf aspheric parts do not fit perfectly in your system, Spoptic can design and manufacture the Precision aspheric lenses by your system-level optical requirement.
2.Built to print, Spoptic fabricates aspheric lenses and provides inspection report by your print.
3.Reverse engineering based on samples you provide, Spoptic runs in-depth mapping and optical performance testing on either aspheric lens part or lens system level products, redesign and optimize including manufacturing and assembly.
Please contact one of our a sphere experts today and find out what Spoptic can help you with your projects.
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Manufacturing Limits for Aspheric Surfaces Based on Form Error Tolerance |
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Form Error > 2μm Lower Resolution Profilometry (2-D)1 |
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Attribute |
Minimum |
Maximum |
|
Diameter (mm) |
3 |
250 |
|
Local Radius (mm) |
-8 (Concave) |
∞ |
|
Sag (mm) |
0 |
502 |
|
Departure (mm) |
0.01 |
20 |
|
Included Angle (°) |
0 |
120 |
|
|
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Form Error 0.5 – 2μm Higher Resolution Profilometry (2-D)1 |
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|
Attribute |
Minimum |
Maximum |
|
Diameter (mm)3 |
3 |
250 |
|
Local Radius (mm) |
-12 (Concave) |
∞ |
|
Sag (mm) |
0 |
252 |
|
Departure (mm) |
0.01 |
20 |
|
Included Angle (°) |
0 |
150 |
|
|
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Form Error < 0.5μm Interferometry with Stitching (3-D) |
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|
Attribute |
Minimum |
Maximum |
|
Diameter (mm)3 |
3 |
250 |
|
Local Radius (mm) |
-13 (Concave) |
∞ |
|
Sag (mm) |
0 |
252,4 |
|
Departure (mm) |
0.002 |
1 |
|
Included Angle (°) |
0 |
120+5 |
