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Aspheric surface calibrator.

|March 25, 2010

Summary

This summary is machine-generated.

A novel non-contact calibrator measures concave optical surfaces with high precision. This innovative instrument uses a laser beam and fringe counting to assess surface deviations from a sphere, demonstrating practical application.

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Area of Science:

Optical engineering
Metrology
Surface characterization

Background:

Accurate measurement of optical surfaces is critical for high-performance optical systems.
Existing methods for measuring aspheric surfaces can be complex or limited in precision.
Concave surfaces present unique challenges for non-contact metrology.

Purpose of the Study:

To develop a new non-contact instrument for measuring rotationally symmetrical, uncoated concave optical surfaces.
To achieve high precision in measuring deviations from spherical shapes.
To demonstrate the practical application of the developed calibrator.

Main Methods:

Development of an aspheric surface calibrator utilizing a non-mechanical contact technique.
Employing two precise air bearings for rotational control about perpendicular axes.
Scanning a focused laser beam across the optical surface and using fringe counting to measure sag differences relative to a reference sphere.

Main Results:

The calibrator measures concave optical surfaces deviating from a sphere by up to 0.5 mm.
Achieved measurement precision of 0.3 micrometers.
Successfully measured both spherical and ellipsoidal surfaces, validating the instrument's practicality.

Conclusions:

The developed aspheric surface calibrator offers a precise and practical non-contact method for characterizing concave optical components.
This technology advances metrology capabilities for optical surface analysis.
The instrument demonstrates potential for quality control in optical manufacturing.