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Wide viewing angle skewed effect of the point spread function in a wavefront coding system.

Tingyu Zhao1, Zi Ye, Wenzi Zhang

  • 1State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, Zhejiang, China. zhaotingyuhippo@gmail.com

Optics Letters
|April 19, 2007
PubMed
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This study analyzes the point spread function (PSF) of wavefront coding (WFC) systems with cubic phase masks at wide viewing angles. Wider angles cause PSF side extension and skew, degrading imaging quality.

Area of Science:

  • Optics and Photonics
  • Image Processing

Background:

  • Wavefront coding (WFC) is an advanced optical technique for extended depth-of-field imaging.
  • Cubic phase masks are used in WFC systems to modify the optical transfer function.
  • Analyzing WFC system performance at wide viewing angles is crucial for practical applications.

Purpose of the Study:

  • To analyze the point spread function (PSF) of a wavefront coding (WFC) system with a cubic phase mask at wide viewing angles.
  • To investigate the impact of object angles on the encoded PSF.
  • To determine the effect of viewing angle on WFC system imaging quality.

Main Methods:

  • Physical optics principles were applied for analysis.
  • Two coordinate transformations were used to derive the pupil function.

Related Experiment Videos

  • The encoded PSF was calculated considering defocus parameters and object angles (alpha, beta).

    • Main Results:

    • Encoded PSFs exhibit side extension as object angles increase.
    • The included angle of the encoded PSF skews to obtuse or acute angles based on the product of object angles (alphabeta).
    • The observed skew and side extension effects are symmetric with respect to the defocus parameter W(020).

    Conclusions:

    • Wide viewing angles negatively impact the imaging quality of WFC systems with cubic phase masks.
    • The analysis provides insights into the angular behavior of the encoded PSF.
    • Understanding these effects is essential for designing robust WFC imaging systems.