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Phase pupil functions for reduction of defocus and spherical aberrations
Samir Mezouari1, Andrew R Harvey
1School of Engineering and Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK.
Optics Letters
|June 5, 2003
Summary
New radially symmetric phase filters extend focal depth and reduce spherical aberration (SA). Their design allows for easier manufacturing using traditional methods compared to previous rectangular designs, improving optical system performance.
Area of Science:
- Optical Engineering
- Aberration Correction
- Phase Filter Design
Background:
- Traditional optical systems suffer from limited focal depth and spherical aberration (SA).
- Previous phase filters for aberration correction often lacked radial symmetry, complicating manufacturing.
- Improving optical performance requires effective methods for extending focal depth and mitigating SA.
Purpose of the Study:
- To derive radially symmetric pupil plane phase retardation functions.
- To extend focal depth and alleviate third-order spherical aberration (SA) effects.
- To enable more convenient manufacturing of phase filters using traditional techniques.
Main Methods:
- Derivation of radially symmetric pupil plane phase retardation functions.
- Minimization of the variation of Strehl ratio with defocus (W20) and spherical aberration (W40).
- Comparison of performance with standard optical systems and previously reported phase filters.
Main Results:
- Successfully derived radially symmetric phase retardation functions.
- Demonstrated extension of focal depth and alleviation of third-order SA.
- Radial symmetry facilitates manufacturing via traditional techniques like diamond machining.
Conclusions:
- Radially symmetric phase filters offer a practical solution for enhancing optical system performance.
- The derived functions effectively extend focal depth and reduce spherical aberration.
- Easier manufacturability makes these filters a viable alternative to previous designs.