A Characterization Method for Unrestricted Image Square Field Distribution

Abstract

The invention provides a method for characterizing the field distribution of the unrestricted image field, which is used to calculate the light intensity distribution of an optical system including an aperture diaphragm and a Fourier lens. The plane and the defocus surface, the calculation method includes the following steps: calculating the complex amplitude transmittance of the plane field distribution of the aperture stop surface; calculating the defocus factor at the defocus plane to be measured; calculating the complex amplitude transmittance and defocus in the frequency domain The Fourier transform of the factor; calculates the light intensity distribution at the out-of-focus plane to be measured. Under the conditions of a given system focal length and working wavelength, the light intensity distribution of the aperture diaphragm with any shape and any off-axis quantity on any defocused surface can be obtained by using the image-side dispersion distribution characterization method adopted in the present invention, In this way, the intensity variation of any aperture diaphragm under any defocus plane can be analyzed.

Description

technical field [0001] The invention relates to the field of optical principles, in particular to a method for characterizing the field distribution of an unrestricted image square. Background technique [0002] Accurate calculation of the spatial light intensity distribution in the image space is of great significance for optical design. Usually, the aperture diaphragm imaging follows the Fresnel diffraction theory. The traditional Fresnel diffraction theory is only applicable to axisymmetric aperture diaphragm imaging optical systems, such as circular aperture, rectangular aperture, etc., and can only calculate the energy distribution at the focal plane, which is difficult to meet the current scientific and technological development for universal imaging. Calculation of energy distribution in square space, such as autofocus system, super-resolution system, depth of field expansion system, etc. SUMMARY OF THE INVENTION [0003] In order to solve the above problems, the p...

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Problems solved by technology

However, the traditional Fresnel diffraction theory is only applicable to axisymmetric aperture diaphragm imaging optical systems, such as circular apertures, rectangular apertures, etc., and can only calculate the energy distribution at the focal plane, which is difficult to meet the requirements of the current scientific and technological development for universal imaging. Calculation of energy distribution in square space, such as autofocus system, super resolution system, depth of field expansion system, etc.

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