Aspheres

Why use a JML asphere?

The surface profile of an asphere differs from a simple lens because of its complex surface profile.  In essence, an asphere is a lens with variations in it’s radius of curvature. It may be convex or concave with sharper departure angles than the center radius or it can be as extreme as a gull wing or double camel back asphere. Below is an example.

The unique shape of the asphere can reduce optical aberrations compared to that of a spherical lens, which allows aspheres to have the ability to replace a more complex optical system made of multiple spherical lenses. Aspheres can help an optical system be smaller, as is required in medical endoscopy applications, or lighter which is desirable in space or flight applications.

Manufacturing Our Aspheres

The JML asphere manufacturing process starts with grinding the glass to the rough spherical shape in our dedicated CNC machine. We have the ability to control manufacturing processes such as feed rate of the tool, tool grit size, step size and much more to minimize the form error and subsurface damage of the lenses.  Following the grinding process the lens will then undergo the polishing process in another CNC machine. This process will accurately polish the lens to its final shape with outstanding quality.   During this polishing process we have the ability to incorporate deterministic polishing, which speeds up the fabrication process and minimizes fabrication iteration and maximizes yield.

Aspherical Optics

  • Sizes: 10mm-200mm
  • Material Types: all the optical glass, fused silica, and Zerodur™
ParameterIndustry Precision ToleranceJML Precision
Form Error/Irregularity1 Wave0.5 Wave
Diameter (mm)+0.00/-0.05+0.00/-0.025
Center Thickness (mm)+/- 0.05+/-0.025
Base Radius (microns)10.5
Wedge (ray deviation-minutes)31
Scratch-Dig40-2010-5

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