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Desensitization to mid-spatial-frequency surface errors.

|November 6, 2019

Summary

Mid-spatial-frequency (MSF) surface errors impact optical system image quality. This study defines a design target for MSF error desensitization, showing its feasibility in systems using freeforms with spheres.

Area of Science:

Optical engineering
Surface metrology

Background:

Mid-spatial-frequency (MSF) surface errors arise from manufacturing processes like small-bit machining of aspheres and freeforms.
These errors can significantly degrade the image quality of optical systems.
Previous research has focused on analyzing and tolerancing MSF errors.

Purpose of the Study:

To define a design target for achieving desensitization to mid-spatial-frequency surface errors.
To demonstrate the possibility of desensitizing optical systems to MSF errors.

Main Methods:

Defining a specific design target for MSF error desensitization.
Investigating optical systems that incorporate freeform optics alongside spherical elements.

Main Results:

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A clear design target for MSF error desensitization has been established.
The study confirms that desensitization to MSF errors is achievable.

Conclusions:

Optical systems utilizing freeforms in conjunction with spheres can be designed to be less sensitive to mid-spatial-frequency surface errors.
This desensitization strategy offers a pathway to improved optical performance despite manufacturing imperfections.