Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Design and Experimental Demonstration of Coaxially Folded All-reflective Imaging System

  • Xiong, Yupeng (College of Intelligent Science, National University of Defense Technology) ;
  • Dai, Yifan (College of Intelligent Science, National University of Defense Technology) ;
  • Chen, Shanyong (College of Intelligent Science, National University of Defense Technology) ;
  • Tie, Guipeng (College of Intelligent Science, National University of Defense Technology)
  • Received : 2018.11.29
  • Accepted : 2019.04.11
  • Published : 2019.06.25
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Abstract

With slimmer, lighter and all-reflective imaging systems in high demand for consumer and military applications, coaxially folded optical image systems are widely considered because they can extend focal length and reduce track length. Most of these systems consist of multiple surfaces, and these surfaces are machined on one element or grouping processing on two elements. In this paper, we report and first experimentally demonstrate an all-aluminum all-reflective optical system which consists of two optical elements, with two high order aspherical surfaces in each element. The coaxially folded system is designed with Seidel aberration theory and advanced optimization with Zemax. The system is made of all-aluminum material processing by single point diamond turning (SPDT). On this basis, we completed the system integration and performed an imaging experiment. The final system has the advantages of short track length and long focal length and broad application prospects in the micro-unmanned aerial vehicle field.

Keywords

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FIG. 1. Layout of coaxially folded system.

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FIG. 2. Structure of concentric multi-reflective optic.

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FIG. 3. The initial design results.

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FIG. 4. The optimal design results.

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FIG. 5. Fabrication of optical surfaces.

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FIG. 6. Assembly screws and matching surface of system.

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FIG. 7. Decenter control with Talyrond 565H.

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FIG. 8. Wavefront of the system.

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FIG. 9. The USAF 1951 chart.

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FIG. 10. Imaging results of system.

TABLE 1. Specifications of folded imaging system

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TABLE 2. Initial parameters of four mirror folded system

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TABLE 3. Results of tolerances analysis

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