Correlated imaging device and correlated imaging method based on optical parametric process

Abstract

The invention discloses a correlated imaging device and a correlated imaging method based on an optical parametric process. The method comprises the steps as follows: modulating the spatial intensity of detection laser to make the laser of which the spatial intensity is distributed randomly be irradiated on a target object; enhancing or converting the frequency of a collected signal reflected or transmitted by the target through an optical parameter conversion module, and using a barrel detector to detect the signal to increase the detection sensitivity of weak signals; and carrying out correlated imaging of the laser signal after optical parameter conversion to obtain a target imaging result. By combining correlated imaging and optical parameter conversion, the advantages of high sensitivity, high resolution and frequency conversion are achieved, and both horizontal image information and vertical distance information of the target object can be provided.

Description

technical field [0001] The invention relates to the technical field of optical imaging, and more particularly relates to an associated imaging device and method based on an optical parameter process. Background technique [0002] Correlation imaging, also known as ghost imaging, is a new imaging mechanism. Traditional optical imaging uses the first-order correlation (intensity, phase) of the light field to obtain information, while correlation imaging uses the second-order or higher-order correlation of the light field. Correlated imaging is first realized by using entangled two-photon pairs. Theoretical and experimental studies in recent years have shown that thermal light sources or pseudothermal light sources can also achieve correlated imaging. Compared with entangled light sources, pseudothermal light source correlative imaging has a broader application prospect because pseudothermal light is easy to obtain. [0003] Correlative imaging first needs to modulate the spa...

AI Technical Summary

Problems solved by technology

Among the existing optical parametric amplification technologies for image enhancement, one scheme is to use point detection, but it must be scanned point by point, and the imaging speed is slow; the other is to use surface detection, but due to the nonlinear optical crystal The cross-section is small, and limited by the receiving bandwidth, it can only achieve imaging in a small field of view

Therefore, the existing technologies and methods for direct image enhancement based on optical parametric amplification are only suitable for laboratory environments.

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