Ghost images, as a form of stray light, are caused by the even reflection of residual reflected light between the optical surfaces of the system. Ghost images can seriously reduce imaging clarity, annihilate targets, and seriously affect the performance of optical systems. The Modulation Transfer Function (MTF) is a parameter used for evaluating the imaging quality of optical systems, but traditional MTF cannot reflect the impact of ghost images on the imaging quality of optical systems. In order to investigate the impact of ghost images on the performance of imaging systems, a calculation model for modulation transfer function (MTF) under the influence of ghost images generated by secondary reflections was constructed, and an example verification was conducted on a system. The verification results showed the effectiveness of the calculation model.
With the development of optical systems to improve the detection accuracy of polarization aberration brings more and more problems, affecting the polarization detection accuracy of the system as well as the imaging contrast, so it is necessary to quantitatively analyze and calculate the polarization aberration. The polarization aberration distribution of a refractive anamorphic optical system is analyzed using a three-dimensional polarized light tracing method. Calculating the distribution of diattenuation and phase retardance for each face type yields a maximum diattenuation of 0.145 and a maximum phase retardance of 1.46x10-2rad both occurring in the second reflector. In addition the Jones pupil and amplitude response matrices of the system were calculated, ghost psf for this deformation optical imaging contrast was limited to the order of 10-6.
Anamorphic optical system has double-plane symmetry. it’s focal length in the two symmetry planes are different. The anamorphic optical system can obtain a wider field of view when using sensors of conventional size. Based on the firstorder aberration characteristics of anamorphic optical systems, a method for designing anamorphic optical systems is proposed in this paper. An anamorphic optical system is designed by using Biconic Surface.
The efficient manufacturing technologies greatly accelerate the development and production process. Optical components have higher precision requirements than mechanical parts. This provides great challenge for rapid manufacturing. Metallic optical system is featured high resolution, wide spectral range, light weight, compact design, low cost and short manufacturing period. Reflective mirrors and supporting structures can be made from the same material to improve athermal performance of the system. Common materials for metal mirrors in optical applications include aluminum, copper, beryllium, aluminum beryllium alloy and so on. Their physical characteristics and relative advantages are presented. Most kinds of metals have good machinability and can be manufactured by many kinds of producing methods. This makes metallic optical system saving 30%~60% cost and time than others. The manufacturing process of metal mirror is different due to its working spectral. The metal mirror can be directly manufactured by single point diamond turning. This is an outstanding technique in point of ultra-precision as well as economical manufacture of mirrors. The roughness values and form accuracy of optical surfaces after diamond turning can satisfy the quality level for applications in the near infrared and infrared range. And for visible light spectral the turning structures must be removed with a smoothing procedure in order to minimize the scatter losses. Some smoothing methods to obtain visible quality metal mirrors are given in this paper. Some new manufacturing technology, such as 3D printing, can be used for metallic optical system and several promising techniques are presented.
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