Zihao Zhang, Yang Zhang, Xinghao Duan, Yi Zhang, Yue Dong, Junli Wang
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This SAS consists of two aspherical lenses, which function simultaneously as an SA, spatial filter, and attenuator. This configuration enhances system compactness and introduces additional degrees of freedom for adjustment. By modifying the alignment of the SAS, various MM nonlinear dynamics can be observed, including center wavelength shifting, spectrum and spatial evolution, harmonic STML, soliton molecules, and a multicolor STML. Our system shows clear advantages in pulse energy (>3 nJ), stability, and tunability compared to other 1.5 μm STML lasers. Incorporating a SM output coupler enables the simultaneous generation of both a SM-CS and a multimode convention soliton (MM-CS), which exhibit similar spectral profiles and pulse durations approaching the transform limit. Our results indicate that soliton-like pulse shaping is crucial for achieving multimode soliton pulses. The pulse energy of SM-CS, measured at 7.05 nJ (35.25 nJ intracavity pulse energy), represents nearly a 10-fold increase compared to previous SM-CS fiber lasers. This STML system with the new SA offers a valuable platform for exploring complex multimode nonlinear dynamics and provides a promising approach for achieving high-energy soliton lasers.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":null,"pages":null},"PeriodicalIF":6.5000,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Spatiotemporal Mode-Locked Multimode Soliton Fiber Laser Based on a Spatial Alignment Structure\",\"authors\":\"Zihao Zhang, Yang Zhang, Xinghao Duan, Yi Zhang, Yue Dong, Junli Wang\",\"doi\":\"10.1021/acsphotonics.4c01563\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The spatiotemporal mode-locking (STML) offers a viable solution to address the energy limit of the single-mode conventional soliton (SM-CS). 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引用次数: 0
摘要
时空模式锁定(STML)为解决单模传统孤子(SM-CS)的能量极限问题提供了一种可行的解决方案。虽然人们已经预测了产生高度多模传统孤子激光器的潜力,但仍然缺乏实验证明。此外,现有的 STML 系统依赖于传统的可饱和吸收体(SA),如非线性偏振演化和材料 SA,由于空间结构复杂或损伤阈值较低,限制了输出参数。据我们所知,我们报告了利用空间排列结构(SAS)首次实验实现的多模 CS 激光器(以 LP21 模式为主)。这种 SAS 由两个非球面透镜组成,可同时用作空间对准结构、空间滤波器和衰减器。这种配置提高了系统的紧凑性,并增加了调整的自由度。通过改变 SAS 的排列,可以观测到各种 MM 非线性动力学,包括中心波长移动、光谱和空间演变、谐波 STML、孤子分子和多色 STML。与其他 1.5 μm STML 激光器相比,我们的系统在脉冲能量(3 nJ)、稳定性和可调谐性方面具有明显优势。结合 SM 输出耦合器,可以同时产生 SM-CS 和多模约定孤子 (MM-CS),它们表现出相似的光谱轮廓和接近变换极限的脉冲持续时间。我们的研究结果表明,类似于孤子的脉冲整形对于实现多模孤子脉冲至关重要。测得的 SM-CS 脉冲能量为 7.05 nJ(腔内脉冲能量为 35.25 nJ),与之前的 SM-CS 光纤激光器相比提高了近 10 倍。这种带有新型 SA 的 STML 系统为探索复杂的多模非线性动力学提供了一个宝贵的平台,并为实现高能孤子激光器提供了一种前景广阔的方法。
Spatiotemporal Mode-Locked Multimode Soliton Fiber Laser Based on a Spatial Alignment Structure
The spatiotemporal mode-locking (STML) offers a viable solution to address the energy limit of the single-mode conventional soliton (SM-CS). While the potential for generating highly multimode conventional soliton lasers has been predicted, experimental demonstrations are still lacking. Moreover, existing STML systems have relied on conventional saturable absorbers (SAs), such as nonlinear polarization evolution and material SAs, which restrict output parameters due to complex spatial structures or low damage thresholds. To the best of our knowledge we report the first experimental realization of a multimode CS laser (dominated by the LP21 mode) using a spatial alignment structure (SAS). This SAS consists of two aspherical lenses, which function simultaneously as an SA, spatial filter, and attenuator. This configuration enhances system compactness and introduces additional degrees of freedom for adjustment. By modifying the alignment of the SAS, various MM nonlinear dynamics can be observed, including center wavelength shifting, spectrum and spatial evolution, harmonic STML, soliton molecules, and a multicolor STML. Our system shows clear advantages in pulse energy (>3 nJ), stability, and tunability compared to other 1.5 μm STML lasers. Incorporating a SM output coupler enables the simultaneous generation of both a SM-CS and a multimode convention soliton (MM-CS), which exhibit similar spectral profiles and pulse durations approaching the transform limit. Our results indicate that soliton-like pulse shaping is crucial for achieving multimode soliton pulses. The pulse energy of SM-CS, measured at 7.05 nJ (35.25 nJ intracavity pulse energy), represents nearly a 10-fold increase compared to previous SM-CS fiber lasers. This STML system with the new SA offers a valuable platform for exploring complex multimode nonlinear dynamics and provides a promising approach for achieving high-energy soliton lasers.
期刊介绍:
Published as soon as accepted and summarized in monthly issues, ACS Photonics will publish Research Articles, Letters, Perspectives, and Reviews, to encompass the full scope of published research in this field.