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Analysis of wavefront coding imaging with cubic phase mask decenter and tilt.
Applied Optics
|September 9, 2016
Summary
Decentering and tilting a cubic phase mask plate predictably alters wavefront coding system imaging. Mask decenter affects the point spread function less in the z-direction than in x and y directions.
Area of Science:
- Optics and optical engineering
- Wavefront coding technology
Background:
- Wavefront coding systems utilize phase masks to enhance imaging performance.
- Understanding the impact of optical element misalignments is crucial for system stability.
Purpose of the Study:
- To investigate the influence of cubic phase mask decenter and tilt on wavefront coding system imaging.
- To analyze how these misalignments affect the system's modulation transfer function and point spread function.
Main Methods:
- Theoretical calculation of the phase term in the pupil function considering mask decenter and tilt.
- Simulation of an on-axis three-mirror Cassegrain system to validate theoretical formulas.
- Experimental verification of the effects of mask decenter on imaging performance.
Main Results:
- Mask decenter and tilt predictably alter the system's modulation transfer function by modifying phase and defocus parameters.
- Simulation results confirm the derived formulas for mask decenter and tilt effects.
- Experimental data shows that mask decenter has a reduced impact on the point spread function along the z-axis compared to the x and y axes.
Conclusions:
- The decenter and tilt of cubic phase mask plates significantly influence wavefront coding system imaging.
- The study provides a predictable model for these effects, aiding in system design and alignment.
- Minimizing decenter along the z-axis is less critical than along transverse directions for point spread function stability.
