Ghost imaging system and imaging method based on fiber array pseudo-thermal light

Abstract

The invention provides a ghost imaging system and imaging method based on fiber array pseudo-thermal light. The ghost imaging system comprises a pulse laser, a fiber coupler, an electro-optic phase modulator, a radio frequency driving power source, a fiber amplifier, a fiber array, a beam expanding collimator, a half-reflecting and half-transparent mirror, a reception telescope, a photoelectric array detector, a signal acquisition module and a signal control and calculation imaging module. Laser light emitted by the pulse laser is divided by the fiber coupler into a plurality of beams of coherent light which are transmitted to the electro-optic phase modulator for random phase modulation, and then, are transmitted to the fiber amplifier for power amplification; after passing through the fiber array, the beam expanding collimator and the half-reflecting and half-transparent mirror, the light is casted to a target; the reception telescope collects scattered light signals and gathers the light signals to the photoelectric detector; electrical signals output by the photoelectric detector are sampled by the signal acquisition module; and the sample data is transmitted to the signal control and calculation imaging module. The ghost imaging system is long in action distance and high in imaging rate, and solves the defects of an existing ghost imaging system.

Description

technical field [0001] The invention belongs to the technical field of optical imaging, in particular to a ghost imaging system and imaging method based on an optical fiber array pseudothermal light source, which can be used for target detection and imaging. Background technique [0002] Ghost imaging, also known as quantum imaging or correlation imaging, is a new imaging technology developed in the past decade. It exploits the correlative properties of light fields to achieve non-local and super-resolution imaging of objects. The earliest ghost imaging experiment used two-photon entanglement source as the light source to realize the imaging of the object, and later used the classical incoherent light source (pseudothermal light, thermal light source) to realize the non-local correlation imaging of the object. Compared with low-efficiency two-photon entanglement light sources, thermo-optic and pseudo-thermal light sources are ubiquitous and easier to obtain, so they have gr...

AI Technical Summary

Problems solved by technology

However, the existing computational ghost imaging systems all use the pseudothermal light source generated by the spatial light modulator (liquid crystal SLM or DMD), which is limited by the response speed and power threshold of the device, and has the following limitations: the generated speckle field rate is low , low imaging rate; low output power of pseudo-thermo-optic light, short working distance

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