Investigation of Optical Transfer Function Without Using Fourier Transformation

• 1、College of Science, Changchun University of Science and Technology, Changchun 130022

Abstract：The optical transfer function (OTF) can be used to evaluate the performance of optical imaging systems comprehensively and objectively. However, current method of determining an optical transfer function is based on analyzing the imaging process in the spatial domain and combining the Fourier transform. To this issue, replacing optical rays by waves, we study the lens imaging of a cosine-fringe pattern and obtain the OTF of the lens without using the Fourier transform. First, the properties of the light waves emitted from the cosine-fringe pattern are analyzed. Then according to the lens\' parameters and the working conditions, the quantity and quality of the coherent waves collected and utilized by the lens are analyzed, and the parameters the cosine-fringe pattern on the image plane are obtained. The OTFs of Investigation of Optical Transfer Function Without Using Fourier Transformation an ideal lens and a lens with aberration are obtained. Finally, the process of interaction between the illuminating light and the cosine-fringe pattern is studied. The characteristics of the cosine-fringe emission are explained by surface-wave radiation, and the reflection coefficient of the cosine-fringe pattern is obtained.

Keywords： Optical Transfer Function Modulation Transfer Function Evaluation of Imaging Quality Optical Imaging Lens Image Formation