材料科学
光电子学
光学
波长
近红外光谱
光子学
红外线的
探测器
铌酸锂
宽带
光通信
角动量
物理
量子力学
作者
Yuan Liu,Wei Chen,Wang Zhang,Chaoqun Ma,Huaixi Chen,Yifeng Xiong,Rui Yuan,Jie Tang,Peng Chen,Wei Hu,Fei Xu,Yanqing Lu
标识
DOI:10.1002/adom.202101098
摘要
Abstract Near‐infrared (NIR) optical vortices (OVs), which carry specific orbital angular momentum, are believed to greatly increase the capacity of conventional optical communication systems. However, due to the equipment limits in invisible wavelengths, NIR OVs detection remains a great difficulty. Here, the up‐conversion imaging technology is exploited to circumvent using NIR detectors. A lithium niobate crystal with its quadratic susceptibility modulated by a specially designed Dammann vortex grating is fabricated to realize the frequency conversion—from NIR to the visible region—while converting multiplexed OVs to Gaussian modes in specific multichannels. During the detection process, the most of energies of the detected OVs are preserved, which can be considered as online detection. Additionally, at least 400 nm applicable wavelength range of this method is experimentally demonstrated, as well as up to 25 independent detection channels. Compared with existing solutions, this scheme enables a large‐broadband wavelength, low energy loss, and multiprocessing channels platform for visible detection of NIR OVs, showing great potential to be applied in optical communication systems.
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