Abstract
High-visibility pseudothermal light source is required by the long-distance ghost imaging technology. In this article, the pulsed pseudothermal light based on a compact and Q-switched laser system with high peak power and intensity is reported. The passively Q-switched technique advances the performance of the pseudothermal light, where the second-order quantum correlation function g 2 value increased from 1.452 to 1.963.
Highlights
Ghost image (GI) is the acquisition of object information by means of photocurrent correlation measurements
Due to its unique physical characteristics, ghost imaging has been widely applied into many fields, such as high-resolution object reconstruction, remote sensing LiDAR, and optical security
We improve the performance of the pseudothermal light source by using a compact laser structure based on the passive Q-switched techniques and frequency doubling with KTP crystal, where the pulse energy exceeding 500 mJ and the high coherence are suitable for the ghost imaging
Summary
Ghost image (GI) is the acquisition of object information by means of photocurrent correlation measurements. We improve the performance of the pseudothermal light source by using a compact laser structure based on the passive Q-switched techniques and frequency doubling with KTP crystal, where the pulse energy exceeding 500 mJ and the high coherence are suitable for the ghost imaging. 2. Materials and Methods e relation between laser coherence and second-order quantum correlation function of pseudothermal light field is studied.
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