近日，国防科技大学的周朴及其研究团队与中国科学院苏州纳米技术与纳米仿生研究所的张凯&王俊勇等人合作并取得一项新进展。经过不懈努力，他们基于各向异性准一维材料实现超快激光状态主动控制。相关研究成果已于2024年4月7日在国际知名学术期刊《光：科学与应用》上发表。

本文采用各向异性准一维层状材料Ta₂PdS₆作为饱和吸收体，利用其极化依赖吸收特性，实现对超快系统中非线性参数的有效调制。基于Ta₂PdS₆的锁模激光器具备极化敏感的非线性光响应特性，能够稳定维持常规孤子和类噪声脉冲两种激光状态。研究人员通过数值模拟，深入揭示了单光纤激光器中激光状态的可切换机理。此外，他们还利用激光作为可编码光源，在该平台上成功进行了数字编码的演示。

据悉，在超快系统中，由于固有损耗和其他非线性效应的影响，激光状态主动控制具有挑战性。在基于低维材料的光学器件中寻求自由度的扩展可能是一个前进的方向。

附：英文原文

Title: Ultrafast laser state active controlling based on anisotropic quasi-1D material

Author: Yang, Zixin, Yu, Qiang, Wu, Jian, Deng, Haiqin, Zhang, Yan, Wang, Wenchao, Xian, Tianhao, Huang, Luyi, Zhang, Junrong, Yuan, Shuai, Leng, Jinyong, Zhan, Li, Jiang, Zongfu, Wang, Junyong, Zhang, Kai, Zhou, Pu

Issue&Volume: 2024-04-07

Abstract: Laser state active controlling is challenging under the influence of inherent loss and other nonlinear effects in ultrafast systems. Seeking an extension of degree of freedom in optical devices based on low-dimensional materials may be a way forward. Herein, the anisotropic quasi-one-dimensional layered material Ta₂PdS₆ was utilized as a saturable absorber to modulate the nonlinear parameters effectively in an ultrafast system by polarization-dependent absorption. The polarization-sensitive nonlinear optical response facilitates the Ta₂PdS₆-based mode-lock laser to sustain two types of laser states, i.e., conventional soliton and noise-like pulse. The laser state was switchable in the single fiber laser with a mechanism revealed by numerical simulation. Digital coding was further demonstrated in this platform by employing the laser as a codable light source. This work proposed an approach for ultrafast laser state active controlling with low-dimensional material, which offers a new avenue for constructing tunable on-fiber devices.

DOI: 10.1038/s41377-024-01423-3

Source: https://www.nature.com/articles/s41377-024-01423-3