CREOL, College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816–2700, USA.
Opt Lett. 2012 Mar 1;37(5):764-6. doi: 10.1364/OL.37.000764.
By exploiting recent developments associated with parity-time (PT) symmetry in optics, we here propose a new avenue in realizing single-mode large area laser amplifiers. This can be accomplished by utilizing the abrupt symmetry breaking transition that allows the fundamental mode to experience gain while keeping all the higher order modes neutral. Such PT-symmetric structures can be realized by judiciously coupling two multimode waveguides, one exhibiting gain while the other exhibits an equal amount of loss. Pertinent examples are provided for both semiconductor and fiber laser amplifiers.
利用最近在光学中与宇称时间（PT）对称性相关的发展，我们在这里提出了一种实现单模大面积激光放大器的新途径。这可以通过利用突然的对称破缺跃迁来实现，该跃迁允许基模经历增益，同时保持所有高阶模式中性。这种 PT 对称结构可以通过巧妙地耦合两个多模波导来实现，一个波导表现出增益，而另一个波导表现出等量的损耗。为半导体和光纤激光放大器都提供了相关示例。
