Lin Gongwei, Zhang Shicheng, Hu Yiqi, Niu Yueping, Gong Jiangbin, Gong Shangqing
Department of Physics, East China University of Science and Technology, Shanghai 200237, China.
School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Phys Rev Lett. 2019 Jul 19;123(3):033902. doi: 10.1103/PhysRevLett.123.033902.
Optical nonreciprocity is of paramount importance to optical signal processing and one-way optical communication. Here, we theoretically and experimentally demonstrate nonreciprocal amplification based on four-level hot atoms by exploiting atomic Doppler shifts. Our approach is simple and easy to implement. In fair agreement with our theoretical modeling, forward power amplification of 26 dB and backward isolation of 30 dB are observed. Our results will open up a new avenue towards realistic devices based on nonreciprocal amplification.
光学非互易性对于光信号处理和单向光通信至关重要。在此，我们通过利用原子多普勒频移，从理论和实验上证明了基于四能级热原子的非互易放大。我们的方法简单且易于实现。与我们的理论模型相当吻合，观察到正向功率放大为26分贝，反向隔离为30分贝。我们的结果将为基于非互易放大的实际器件开辟一条新途径。
