Photon sieve primary mirror dual-color imaging optical system and its application

Abstract

The invention discloses a photon sieve main mirror double-color imaging optical system and an application thereof. The photon sieve main mirror double-color imaging optical system is composed of a photon sieve main mirror, a spectroscope, a first imaging optical path and a second imaging optical path. Optical radiation is collected by the photon sieve and is aggregated on the surface of the spectroscope, light with a wavelength of 656.45nm passes through the spectroscope and is aggregated and imaged by the first imaging optical path, and light with a wavelength of 587.60nm is reflected by the spectroscope to the second imaging optical path and then is aggregated and imaged. According to the invention, the optical system can serve as a space telescope for observing proportions of two substance components, i.e., hydrogen and helium of the sun. The photon sieve main mirror is composed of a lot of circular light through holes, there are no requirements for processing precision of hole depth, the processing difficulty of the photon sieve main mirror is greatly reduced, and the processing difficulty of the photon sieve main mirror is far lower than that of a diffraction lens and a harmonic diffraction lens; and the photon sieve main mirror can maintain a folded state in a satellite lunching process and is then expanded to form a plane after being lunched to an orbit, and the caliber requirement of a carrier rocket is low.

Description

technical field [0001] The invention belongs to the technical field of remote sensing optical system design and image quality analysis, and relates to a photon sieve primary mirror two-color imaging optical system and its application. Background technique [0002] Photon sieves were originally proposed by Kipp and other scholars at Kiel University in Germany to improve the focusing ability of soft x-rays. The paper was published in the journal "Nature" in 2001. Since then, the United States, Europe, and Japan have successively carried out research on photon sieve technology. Photon sieves are derived from the Fresnel zone plate structure. The Fresnel zone plate is composed of a series of transparent and opaque concentric rings, while the photon sieve is composed of an array of rings filled with tiny light holes, just like many small-diameter lens arrays in the same phase, each micropore of the photon sieve The coherent superposition of diffracted light forms an optical ima...

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Problems solved by technology

[0003] However, the photon sieve has a strong dispersion effect. Although it can achieve good image quality for the design wavelength, it cannot converge the imaging point on the same focal plane for other wavelengths of light, and the chromatic aberration is very large, which leads to the work of the photon sieve primary mirror imaging system. Very narrow band

For example, the photon sieve primary mirror imaging system used by the FalconSAT-7 satellite being developed by the United States has a working band of only 0.1nm, which can only be used to detect the 656.45nm radiation spectral line of hydrogen atoms in the sun.

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