Articles

FIGURE 1. An aspheric lens is mounted on a brass arbor.

Test & Measurement

Asphere Fabrication: Deterministic aspheric polishing uses multiwavelength interferometry for metrology

Using a metrology device and corrective software, CNC polishers can now use deterministic polishing to directly achieve form errors of sub-100 nm.

FIGURE 1. Data from different zones of an aspheric surface measured by a Verifire Asphere interferometer are combined in software to obtain the optic's shape.

Test & Measurement

Photonics Products: Interferometers: Numerous ways exist to interferometrically measure aspheres

Aspheric optics can be measured using a Fizeau interferometer, or by using an optical profiler containing an interferometer; both approaches have a variety of forms.

(Image: Taylor Hobson)

Software

3D metrology improves from accuracy of diffractive optics

Taylor Hobson and Precitech have combined their expertise to develop a new process to measure, analyze, and correct for diffractive-optics form errors in three dimensions.

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