基于泵浦强度调制的超快光纤激光器中孤子分子的光谱脉动动力学

None Zhen Fang, None You Yu, None Qiu ye Zhao, None Yu dong Zhang, None Zhi Qiang Wang, None Zu Xing Zhang
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引用次数: 0

摘要

本研究采用实时傅立叶变换光谱研究了锁模掺铒光纤激光器中孤子分子的脉动动力学,利用泵浦强度调制。通过控制泵浦源的驱动电压,系统地观察和表征了外部调制信号对脉冲孤子分子的幅值、周期、脉动频率和相对相位演化的影响。结果表明,在特定的泵浦强度调制条件下,泵浦调制频率可以精确地调节孤子分子光谱的脉动周期。同时,孤子分子脉动的振幅和孤子间相对相位的演化与泵浦调制频率有着复杂的关系。在较低的调制频率下,如1khz,孤子分子内脉冲之间的相对相位随传播时间的变化表现为滑动型动力学。当调制频率逐渐增加,例如到5khz时,就会产生三个孤子分子。值得注意的是,在泵浦调制的影响下,孤子间距和相对相位都发生同步调整。随着调制频率的进一步提高,例如到20khz,孤子分子内脉冲之间的相对相位演化逐渐陷入混沌。这一观察结果表明,脉动孤子分子可能存在固有的共振频率,这对它们的稳定性有直接的影响。本研究的发现对于提高我们对孤子分子生成的理解和提高孤子分子的稳定性具有重要意义。此外,它们为全光操作和孤子分子的应用以及它们在锁模激光系统中的脉冲编码中的应用提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spectral pulsation dynamics of soliton molecules in ultrafast fiber lasers based on pump intensity modulation
This study employs real-time Fourier transform spectroscopy to investigate the pulsation dynamics of soliton molecules in a mode-locked erbium-doped fiber laser, utilizing pump intensity modulation. By manipulating the driving voltage of the pump source, we systematically observe and characterize the impact of external modulation signals on the amplitude, period, pulsation frequency, and the relative phase evolution among the pulsating soliton molecules within their spectra.The results demonstrate that, under specific conditions of pump intensity modulation, the pulsation period of soliton molecule spectra can be precisely regulated by the pump modulation frequency. Concurrently, the amplitude of soliton molecule pulsations and the evolution of relative phase among the solitons are intricately tied to the pump modulation frequency. At lower modulation frequencies, such as 1 kHz, the relative phase among the pulses within the soliton molecule exhibits a sliding-type dynamics as a function of propagation time.As the modulation frequency gradually increases, e.g., to 5 kHz, a scenario emerges where three soliton molecules are generated. Notably, both the soliton spacing and relative phase undergo synchronous adjustments influenced by the pump modulation. With further escalation of the modulation frequency, such as to 20 kHz, the relative phase evolution among the pulses within the soliton molecule gradually descends into chaos. This observation suggests the plausible existence of an inherent resonant frequency associated with pulsating soliton molecules, which has direct implications for their stability.The findings of this research hold significant relevance for advancing our comprehension of soliton molecule generation and enhancing their stability. Furthermore, they offer valuable insights into the broader domain of all-optical manipulation and applications of soliton molecules, as well as their utilization in pulse encoding within mode-locked laser systems.
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