激光雷达
物理
连贯性(哲学赌博策略)
光学
相干时间
测距
光子
相干长度
干扰(通信)
连贯度
相干理论
激光器
计算机科学
电信
量子力学
超导电性
频道(广播)
作者
Chung-Hyun Lee,Yosep Kim,Dong-Gil Im,U-Shin Kim,Vincenzo Tamma,Yoon-Ho Kim
标识
DOI:10.1103/physrevlett.131.223602
摘要
Coherent light detection and ranging (LIDAR) offers exceptional sensitivity and precision in measuring the distance of remote objects by employing first-order interference. However, the ranging capability of coherent LIDAR is principally constrained by the coherence time of the light source determined by the spectral bandwidth. Here, we introduce coherent two-photon LIDAR, which eliminates the range limitation of coherent LIDAR due to the coherence time. Our scheme capitalizes on the counterintuitive phenomenon of two-photon interference of thermal light, in which the second-order interference fringe remains impervious to the short coherence time of the light source determined by the spectral bandwidth. By combining this feature with transverse two-photon interference of thermal light, we demonstrate distance ranging beyond the coherence time without relying on time-domain interference fringes. Moreover, we show that our coherent two-photon LIDAR scheme is robust to turbulence and ambient noise. This work opens up novel applications of two-photon correlation in classical light.
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