Two-dimensional compression ghost imaging system and method based on coincidence measurement

Abstract

The invention relates to a two-dimensional compression ghost imaging system based on coincidence measurement. The two-dimensional compression ghost imaging system comprises a laser, rotating frosted glass, an object, a spatial light modulator, a first set of convergent optical absorption lens, a second set of convergent optical absorption lens, a first point detector, a second point detector, a coincidence measurement circuit and an algorithm module, wherein laser emitted by the laser irradiates the frosted glass to produce pseudo calorescence which is divided into an object arm optical path and a reference arm optical path; on the object arm optical path, an optical field of the pseudo calorescence is spread to the object, and the total light intensity is collected through the first set of convergent optical absorption lens and the first point detector; on the reference arm optical path, the optical field of the pseudo calorescence is spread to the spatial light modulator, and after modulation, the total light intensity is collected through the second set of convergent optical absorption lens and the second point detector; the coincidence measurement circuit is used for carrying out coincidence measurement on the total light intensity of the object arm optical path and the reference arm optical path and outputting coincidence measurement values, and the algorithm module is used for reconstructing the distribution of spatial correlation coefficients according to a measurement matrix and the measurement values by applying a compression perception algorithm.

Description

technical field [0001] The invention relates to the field of correlation imaging, in particular to a two-dimensional compressed ghost imaging system and method based on coincidence measurement. Background technique [0002] Correlation imaging, or ghost imaging (GI), is one of the frontiers and hotspots in the field of quantum optics in recent years. Associative imaging can generate an image of an object on an optical path that does not contain the object, and has received extensive attention as a new imaging technology. [0003] Since the 1980s, some new optical phenomena, such as ghost imaging, ghost interference, and subwavelength interference, have been discovered in theoretical and experimental studies of two-photon entangled states generated by spontaneous parametric down-conversion processes in nonlinear crystals. Wait. These peculiar physical effects have updated our traditional concept of optical phenomena and provided the possibility to develop new optical inform...

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Problems solved by technology

[0006] In some special occasions, such as extremely weak light ghost imaging, solar light ghost imaging, solar light ghost imaging requires narrow-band filtering, and the light intensity is also extremely weak, so an ultra-high-sensitivity area array detector is required in the reference arm, while CCD photosensitive Sensitivity cannot meet the requirements, and only ICCD, EMCCD, and avalanche diode array can realize the detection of the reference arm. Expensive, and when the area array is detected, the luminous flux will be evenly distributed on the entire detection surface, and the luminous flux shared by the unit pixel will be very small, which will directly affect the final imaging quality

For cost considerations, the reference arm can also use a single-photon point detector for point scanning, but it will also encounter the limitation of luminous flux, and it will take a lot of measurement time to form a 10×10 image. Nearly 1 year, which greatly limits the development of research

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