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Laser Application and Sparse Imaging Analysis of Diffractive Optical System
DOI: 10.12000/JR19081
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Abstract
In recent years, the diffractive optical systems have developed rapidly. Diffractive devices such as binary optical device and membrane-based lens are equivalent to fixed phase shifters of microwave antennas. Thus, the mature theories and methods of a microwave phased-array antenna could be used for diffractive devices’ performance analysis. Both laser Synthetic Aperture Radar (SAR) and laser communication feature a single color and long wavelength, and they are specifically suitable for non-imaging diffractive optical systems. A signal wave front control realized by a diffraction device reduces the focal length and the weight of a system. Research on laser SAR and laser communication technology has important theoretical significance and application value for diffractive optical system. In this paper, we provide a phased-array interpretation of a diffractive optical system and introduce research that has been conducted on airborne and spaceborne laser SAR with respect to diffractive optical systems. We propose the concept of shipborne 1 m diffraction aperture laser communication and an interferometric positioning system and analyze its performance. The results indicated that, using a 10 m short baseline, this system can reach 400 million km with a corresponding positioning accuracy of 6 km that is suitable for use during deep space probes. We also discuss the sparse-sampling laser-imaging problem using a laser to illuminate the target, transforming the laser image signal into the frequency domain with Fourier lens, using the small-scale detector to perform sparse sampling in the low-frequency domain, and reconstructing the target image using a computer. Some preliminary simulation results are provided. -
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References
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- Figure 1. Schematic diagram of an airborne laser SAR receiving diffraction optical system using a diffraction device at both the feed and the main mirror
- Figure 2. Schematic diagram of spaceborne laser SAR system based on diffractive optical system
- Figure 3. Schematic diagram of diffractive optical system based on optical synthetic aperture
- Figure 4. Schematic diagram of short baseline laser communication interferometric system on the ship
- Figure 5. Schematic diagram of a diffractive optical system for laser beam two-dimensional scanning
- Figure 6. Schematic diagram of 4f experiment in Fourier optical imaging
- Figure 7. Original image, two-dimensional spectrum and its partial enlarged view
- Figure 8. The 1/2×1/2 scale frequency domain detector range, its corresponding image and partial enlarged view
- Figure 9. The 1/4×1/4 scale frequency domain detector range, its corresponding image and partial enlarged view
- Figure 10. The range of 5 1/4×1/4 scale frequency domain detector with gaps, its corresponding image and partial enlarged view