Point spread function of apodised optical systems under the combined influence of defocusing and primary spherical aberration

2003 ◽  
Author(s):  
D. Karuna Sagar ◽  
M. Keshavulu Goud
Keyword(s):  
Point Spread Function ◽  
Spherical Aberration ◽  
Optical Systems ◽  
Point Spread ◽  
Spread Function

Influence of optimum balanced linear coma on disk spread functions

1978 ◽  
Vol 56 (1) ◽  
pp. 12-16
Author(s):  
A. K. Gupta ◽  
R. N. Singh ◽  
K. Singh
Keyword(s):  
Intensity Distribution ◽  
Point Spread Function ◽  
Optical Systems ◽  
Point Spread ◽  
Spread Function ◽  
Special Case ◽  
Optimum Balance

Disk spread functions are evaluated to study the performance of optical systems in the presence of linear coma. Optimum balance among various coma terms based on Strehl intensity criterion is used and the applicability of this balance to imaging of extended objects is examined. Graphical results of intensity distribution in the paraxial receiving plane for the diffraction images of extended circular targets for various sizes and azimuths are presented. Results for the point spread function in presence of optimum balanced linear coma come out as a special case and are also included.

Truncated apodizers for engineering the point spread function of optical systems

2021 ◽  
Author(s):  
Andra Naresh Kumar Reddy ◽  
Ramprasad Lachimala ◽  
Mahdieh Hashemi ◽  
Dasari Karuna Sagar
Keyword(s):  
Point Spread Function ◽  
Optical Systems ◽  
Point Spread ◽  
Spread Function

scholarly journals Spherical Aberration of Point Spread Function with Asymmetric Pupil Mask

2016 ◽  
Vol 2016 ◽  
pp. 1-5
Author(s):  
Naresh Kumar Reddy Andra ◽  
Karuna Sagar Dasari
Keyword(s):  
Point Spread Function ◽  
Spherical Aberration ◽  
Spherical Wave ◽  
Super Resolution ◽  
Central Peak ◽  
Phase Mask ◽  
One Dimensional ◽  
Point Spread ◽  
Spread Function ◽  
Wave Aberration

Point spread function underneath spherical wave aberration with antiphase apodization has been obtained by one-dimensional pupil mask functions. In the presence of spherical aberration, suppression of optical side-lobes has increased on one side of the point spread function with the width of the periphery strips within the pupil mask. On introducing wave aberration effect, there exists dependence of the lateral resolution of central peak of the asymmetric point spread function on the amount of amplitude masking. However, the magnitude of intensity of central peak is originated be to amplified by the highest degree of amplitude and phase masking. Additionally, for aberrated asymmetric PSF, FWHM increases and it further decreases with the control parameters of amplitude and phase mask. The magnitude of this corollary can quantify the super resolution of diffracted structures under spherical aberration.

A NOVEL ANALYTICAL SPACE-VARIANT POINT SPREAD FUNCTION MODEL FOR UNDERCORRECTED OPTICAL SYSTEMS

2000 ◽  
Vol 10 (05n06) ◽  
pp. 305-313
Author(s):  
THOMAS P. COSTELLO ◽  
WASFY B. MIKHAEL
Keyword(s):  
Point Spread Function ◽  
Diffraction Theory ◽  
Optical Systems ◽  
Optical Transfer Function ◽  
Point Spread ◽  
Proposed Model ◽  
Direct Sampling ◽  
Spread Function ◽  
Optical Transfer ◽  
Space Variant

An analytical model is developed for the space-variant (SV) point-spread-function (PSF) of an undercorrected optical system with a rectangular aperture. The model accommodates broadening and shifting of the central lobe, as well as sidelobe asymmetry of the PSF, as field angle increases. These effects are exhibited by diffraction-based PSF models. The proposed model uses eight parameters for any specific field position, compared to ~ 210 parameters required for direct sampling of an individual PSF. The model is adapted to PSFs developed from diffraction theory using an adaptive system with gradient descent parameter adjustment. Consequently, the model is useful for applying certain SV digital image restoration methods because it significantly reduces the memory required to store PSF sample functions. In addition, the model does not require samples of the PSF or a DFT operation to obtain samples of the optical transfer function (OTF). Thus, the efficiency of SV restoration methods applied in the frequency domain, such as sectioning approaches, is further improved. Data presented confirms the accuracy and the computational advantage of the model by quantifying its adaptation to a physical PSF over a range of field angles.

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