Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, Shaanxi Province, Xi'an Jiaotong University, Xi'an, 710049, China.
Sci Rep. 2017 Aug 14;7(1):8015. doi: 10.1038/s41598-017-08374-3.
Recent years have seen vast progress in image modulation based on atomic media, with potential applications in both classical optical imaging and quantum imaging regions. However, there have been few investigations of how thermal light images interact with an electromagnetically induced transparent medium. In this letter, we experimentally demonstrate pseudo-thermal light modulation on coherent population trapping conditions in Rb vapor. By introducing the Laguerre-Gaussian beam as the control beam and the encoded speckle as the probe beam, we obtained sharper speckle patterns after the atom cell compared with that in free space. The spatially modulated thermal light was then used to enhance the image resolution in ghost imaging of which the resolution was enhanced by factor 3, since the ghost image resolution is heavily reliant on the speckle's transverse coherent length. Our results are promising for potential applications in high resolution ghost imaging and image metrology, image processing and biomedical imaging.
近年来，基于原子介质的图像调制技术取得了巨大进展，在经典光学成像和量子成像领域都有潜在的应用。然而，对于热光图像如何与电磁感应透明介质相互作用的研究还很少。在这封信中，我们在铷蒸气中相干布居囚禁条件下实验演示了伪热光调制。通过引入拉盖尔-高斯光束作为控制光束和编码散斑作为探针光束，我们在原子单元后获得了比自由空间更清晰的散斑图案。然后，我们使用空间调制的热光来增强鬼成像中的图像分辨率，由于鬼像分辨率严重依赖于散斑的横向相干长度，因此分辨率提高了 3 倍。我们的结果有望在高分辨率鬼成像和图像计量学、图像处理和生物医学成像等领域得到应用。
