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Variable optical null based on a yawing CGH for measuring steep acylindrical surface.

Junzheng Peng, Dingfu Chen, Hongwei Guo

|August 19, 2018

Summary

This summary is machine-generated.

Measuring steep acylindrical surfaces is challenging due to large slopes. This study proposes a novel yawing cylinder null strategy and stitching approach to accurately measure acylindrical lenses, simplifying the process.

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Area of Science:

Optical metrology
Surface characterization
Aspheric optics manufacturing

Background:

Steep acylindrical surfaces present measurement challenges due to localized slopes causing fringe density issues in off-axis subapertures.
Existing methods may struggle with the high aberrations introduced by these complex geometries.

Purpose of the Study:

To develop an effective strategy for measuring steep acylindrical surfaces with high accuracy.
To overcome the limitations of fringe density in interferometric measurements of off-axis subapertures.
To propose a simplified and cost-effective measurement system.

Main Methods:

Analysis of off-axis acylindrical subaperture departures.
Implementation of a measurement strategy involving yawing the cylinder null at various angles.
Development of an acylindrical stitching approach to integrate subaperture data.
Utilizing generated acylindrical wavefronts to compensate for aberrations.

Main Results:

Successfully reduced fringe densities within the vertical dynamic range of interferometers.
Enabled measurement of an acylindrical lens with an 81µm departure from the best-fitting cylinder.
Demonstrated the effectiveness of the yawing cylinder null and stitching approach.

Conclusions:

The proposed yawing cylinder null strategy effectively compensates for aberrations in off-axis subapertures.
The acylindrical stitching approach allows for seamless integration of measurement data.
This method provides a simple, inexpensive, and accurate solution for measuring steep acylindrical surfaces without requiring additional reconfigurable optical nulls.