Moura André L, Pincheira Pablo I R, Reyna Albert S, Raposo Ernesto P, Gomes Anderson S L, de Araújo Cid B
Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil.
Grupo de Física da Matéria Condensada, Núcleo de Ciências Exatas-NCEx, Campus Arapiraca, Universidade Federal de Alagoas, 57309-005 Arapiraca, Alagoas, Brazil.
Phys Rev Lett. 2017 Oct 20;119(16):163902. doi: 10.1103/PhysRevLett.119.163902.
We demonstrate the replica symmetry breaking (RSB) phenomenon in the spontaneous mode-locking regime of a multimode Q-switched Nd:YAG laser. The underlying mechanism is quite distinct from that of the RSB recently observed in random lasers. Here, there is no random medium and the phase is not glassy with incoherently oscillating modes as in random lasers. Instead, in each pulse a specific subset of longitudinal modes are activated in a nondeterministic way, whose coherent oscillation dominates and frustrates the others. The emergence of RSB coincides with the onset of ultrashort pulse generation typical of the spontaneous mode-locking regime, both occurring at the laser threshold. On the other hand, when high losses are introduced, RSB is inhibited and only the amplified stimulated emission with replica symmetry is observed. Our results disclose the only theoretically predicted photonic phase with RSB that remained unobserved so far.
我们在多模调Q Nd:YAG激光器的自主动模锁定 regime中展示了复制对称破缺（RSB）现象。其潜在机制与最近在随机激光器中观察到的RSB机制截然不同。在这里，不存在随机介质，并且相位不像随机激光器那样具有非相干振荡模式的玻璃态。相反，在每个脉冲中，纵向模式的特定子集以非确定性方式被激活，其相干振荡占主导并抑制其他模式。RSB的出现与自主动模锁定 regime典型的超短脉冲产生的开始相吻合，两者都发生在激光阈值处。另一方面，当引入高损耗时，RSB受到抑制，仅观察到具有复制对称的放大受激辐射。我们的结果揭示了迄今为止尚未观察到的唯一理论预测的具有RSB的光子相。
