Pupil modulation coronagraph system for high-contrast imaging and working method

Abstract

The invention discloses a pupil modulation coronagraph system for high-contrast imaging, and relates to the technical field of coronagraph, the pupil modulation coronagraph system comprises a telescope incident end 1, a fixed star simulation light source 2, a collimating lens 3, an aperture diaphragm 4, a pupil modulator 5, an imaging lens 6 and an imaging detector 7, and the two ends of the system are respectively provided with the telescope incident end 1 and the imaging detector 7. The pupil modulator 5 comprises a plurality of modulation bands with different transmittances, the whole modulation band is mainly composed of a plurality of metal film layers with different extinction coefficients, and the extinction coefficients of the metal film layers from the edge areas of the two sides of the whole modulation band to the middle area of the whole modulation band are gradually increased. The invention further discloses a working method of the pupil modulation coronagraph system for high-contrast imaging. According to the pupil modulation coronagraph system for high-contrast imaging and the working method, the transmittance value and the film layer thickness of a modulation band are synchronously optimized, and strong diffraction light of fixed stars is inhibited by combining selection of different coating materials, so that optimal high-contrast imaging is finally obtained.

Description

technical field [0001] The invention relates to the technical field of coronagraphs, in particular to a pupil modulation coronagraph system and working method for high-contrast imaging. Background technique [0002] Exoplanets are planets outside our solar system, i.e. planetary systems around other stars or independent planets outside our solar system. Exoplanet detection is closely related to the search for extraterrestrial civilizations, which can break through human understanding of existing life and ultimately expand human living space. [0003] So far, the vast majority of exoplanets discovered have been detected indirectly through the transit method or the Doppler effect method. Direct imaging, which physically separates light from stars and planets, is key to confirming signatures of life in extrasolar systems. A coronagraph is an important tool to realize high-contrast direct imaging of exoplanets. It can effectively suppress the strong diffracted light from stars...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a pupil modulation coronagraph system and working method for high-contrast imaging, so as to solve the problems of the current coronagraph system based on pupil modulation technology proposed in the above-mentioned background technology, no matter whether the transmittance is adopted Neither the modulation method nor the micro-dot variable density modulation method fully considers the influence of wave aberration caused by factors such as coating layers with different thicknesses or uneven distribution of micro-dots in space.

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