Topic
Contrast transfer function
About: Contrast transfer function is a research topic. Over the lifetime, 934 publications have been published within this topic receiving 26533 citations.
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TL;DR: In this paper, the current density distribution of electron beam spots for high-resolution electron optical systems was studied using the wave aberration concept and paraxial expansion of charge density.
1 citations
TL;DR: In this article, a method of measuring the optical transfer function of optical systems is studied by means of a Fourier transform holographic technique which is used to produce the point spread intensity and to transform it into an optical transfer functions.
1 citations
1 citations
26 Jun 2017
TL;DR: In this article, the influence of spherical aberration coefficients on the depth of focus of optical systems is analyzed and the conditions for aberration coefficient are derived for two cases when either the Strehl definition or the gyration radius should be identical in two symmetric planes with respect to the paraxial image plane.
Abstract: This contribution describes how to model the influence of spherical aberration coefficients on the depth of focus of
optical systems. Analytical formulas for the calculation of beam's caustics are presented. The conditions for aberration
coefficients are derived for two cases when we require that either the Strehl definition or the gyration radius should be
the identical in two symmetrically placed planes with respect to the paraxial image plane. One can calculate the
maximum depth of focus and the minimum diameter of the circle of confusion of the optical system corresponding to
chosen conditions. This contribution helps to understand how spherical aberration may affect the depth of focus and how
to design such an optical system with the required depth of focus. One can perform computer modelling and design of
the optical system and its spherical aberration in order to achieve the required depth of focus.
1 citations
14 Jun 2009
TL;DR: In this article, the authors developed a numerical simulation based on the coherent transfer function (CTF), which is able to simulate all three dimensions and time while accounting for coherent light, short pulses, aberrations, chirp, pulse delay, numerical aperture, the intensity distribution and the polarization of the incident light.
Abstract: To be able to understand and improve various optical systems including fs-laser lightsources, we developed a numerical simulation based on the coherent transfer function (CTF). Our work created a simulation tool, which is able to simulate all three dimensions and time while accounting for coherent light, short pulses, aberrations, chirp, pulse delay, numerical aperture, the intensity distribution and the polarization of the incident light. We explain the theoretical approach and aspects necessary for the simulations. Then we show the capabilities of our tool in simulation aberrations, 4Pi point spread functions, two objective fs-pulse interaction and multi objective confocal fluorescence microscopy.
1 citations