西安交通大学电子科学与工程学院电子陶瓷与器件教育部重点实验室，国际电介质研究中心，陕西 西安 710049
设计开发了用于赝热光鬼成像的时序可控系统，该系统能对赝热光鬼成像系统硬件进行精准的同步控制，从而对散斑尺寸和采样次数等影响成像质量的因素进行定量分析，实现不同条件下的高质量成像。同时在鬼成像系统中结合差分鬼成像、归一化鬼成像和正负关联成像，针对正负关联算法重构图像提出了二次优化方案，进一步提升了赝热光鬼成像系统的成像质量。通过实验验证了系统的时序控制性能和算法的优化效果。
成像系统 鬼成像系统 同步控制 成像算法 成像质量
Author Affiliations
Abstract
1 Key Laboratory of Multifunctional Materials and Structures, Ministry of Education, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2 Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
3 Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Ministry of Education, Department of Applied Physics, Xi’an Jiaotong University, Xi’an 710049, China
A new architecture, naked-eye ghost imaging via photoelectric feedback, is developed that avoids computer algorithm processing. Instead, the proposed scheme uses a photoelectric feedback loop to first realize the correlation (multiplication) process of the traditional ghost imaging system. Then, the vision persistence effect of the naked eye is exploited to implement the integral process and to generate negative images. Two kinds of feedback circuits, the digital circuit and the analog circuit, are presented that can achieve a feedback operation. Based on this design, high-contrast real-time imaging of moving objects is obtained via a special pattern-scanning architecture on a low-speed light-modulation mask.
ghost imaging naked-eye photoelectric feedback Chinese Optics Letters
2020, 18(9): 091101
Author Affiliations
Abstract
Based on double optical pumping channels, we experimentally study the competition between two coexistent six-wave mixing (SWM) processes falling into two electromagnetically induced transparency windows by scanning the frequency of the probe field in two similar five-level atomic systems of 85Rb. By blocking one optical pumping channel unrelated to the four-wave mixing (FWM) process, one SWM process, together with the FWM process, generated by a conjugated small-angle static grating could be observed in the spectrum. Moreover, the other SWM process obtained by blocking the first SWM channel is also observed together with the FWM process in a lower N-type four-level subsystem. These experimental results agree well with theoretical predictions.
190.4180 Multiphoton processes 270.1670 Coherent optical effects 190.4223 Nonlinear wave mixing Chinese Optics Letters
2011, 9(12): 121902
Author Affiliations
Abstract
1 Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049
2 Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
3 State Key Laboratory of Transient Optics and Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710068
We study the co-existing four-wave mixing (FWM) process with two dressing fields and the six-wave mixing (SWM) process with one dressing field in a five-level system with carefully arranged laser beams. We also show two kinds of doubly dressing mechanisms in the FWM process. FWM and SWM signals propagating along the same direction compete with each other. With the properly controlled dressing fields, the FWM signals can be suppressed, while the SWM signals have been enhanced.
四波混频 六波混频 Autler-Townes分裂 190.4380 Nonlinear optics, four-wave mixing 270.4180 Multiphoton processes 300.2570 Four-wave mixing 320.7110 Ultrafast nonlinear optics 030.1670 Coherent optical effects Chinese Optics Letters
2008, 6(9): 685
