Qian Zi-Chen, Liu Meng, Luo Ai-Ping, Luo Zhi-Chao, Xu Wen-Cheng
Opt Express. 2022 Jun 6;30(12):22066-22073. doi: 10.1364/OE.456929.
The evolution of ultrafast laser technology hinges partially on the understanding of the soliton nonlinear dynamics. Recently, the concept of pure-quartic soliton (PQS) that arises from the balance of pure negative fourth-order dispersion (FOD) and nonlinearity was proposed to generate high peak power pulse. Herein, we investigate the generation of dissipative pure-quartic soliton (DPQS) in a fiber laser, which is balanced among the positive FOD, nonlinearity, gain and loss. The DPQS features the shape-preserving propagation despite the asymmetrical temporal profile at higher pulse energy. It is found that the asymmetrical temporal profile of DPQS is resulted from the mismatching of the phase shift profiles caused by self-phase modulation and FOD. Moreover, it is demonstrated that the DPQS possesses a higher energy-scaling ability compared to conventional dissipative soliton, owing to the nonlinear relationship between the pulse energy and pulse duration. These findings demonstrated that the employment of positive FOD could be a promising way for manipulation of optical pulse as well as the improvement of laser performance.
超快激光技术的发展部分取决于对孤子非线性动力学的理解。最近，为了产生高峰值功率脉冲，人们提出了由纯负四阶色散（FOD）和非线性平衡产生的纯四次孤子（PQS）概念。在此，我们研究了光纤激光器中耗散纯四次孤子（DPQS）的产生，它在正FOD、非线性、增益和损耗之间达到平衡。尽管在较高脉冲能量下具有不对称的时间轮廓，但DPQS具有形状保持传播的特性。研究发现，DPQS的不对称时间轮廓是由自相位调制和FOD引起的相移轮廓不匹配导致的。此外，结果表明，由于脉冲能量与脉冲持续时间之间的非线性关系，DPQS相比传统耗散孤子具有更高的能量缩放能力。这些发现表明，采用正FOD可能是操纵光脉冲以及改善激光性能的一种有前途的方法。
