物理学报2024，Vol.73Issue(1)：87-93,7.DOI:10.7498/aps.73.20231030
基于泵浦强度调制的超快光纤激光器中孤子分子光谱脉动动力学研究
Spectral pulsation dynamics of soliton molecules in ultrafast fiber lasers based on pump intensity modulation
摘要
Abstract
This study employs real-time Fourier transform spectroscopy to investigate the pulsation dynamics of soliton molecules in a mode-locked erbium-doped fiber laser,by modulating pump intensity.By controlling the driving voltage of the pump source,we systematically observe and characterize the influence of external modulation signals on the amplitude,period,pulsation frequency,and the relative phase evolution among the pulsating soliton molecules in 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.At the same time,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 in the soliton molecule exhibits a sliding-type dynamics as a function of propagation time. As the modulation frequency gradually increases 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 the modulation frequency further increasing,say,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 are of significance in advancing our comprehension of soliton molecule generation and enhancing their stability.In addition,they provide valuable insights into the broader domain of all-optical manipulation and applications of soliton molecules,and their application in pulse encoding in mode-locked laser systems.关键词
孤子分子/泵浦强度调制/光谱脉动/色散傅里叶变换Key words
soliton molecule/pump intensity modulation/spectral fluctuation/dispersive Fourier transform引用本文复制引用
方振,余游,赵秋烨,张昱冬,王治强,张祖兴..基于泵浦强度调制的超快光纤激光器中孤子分子光谱脉动动力学研究[J].物理学报,2024,73(1):87-93,7.基金项目
国家自然科学基金(批准号:62175116,62375001)和南京邮电大学1311人才计划资助的课题.Project supported by the National Natural Science Foundation of China(Grant Nos.62175116,62375001)and the 1311 Talent Program Project of Nanjing University of Posts and Telecommunications,China. （批准号:62175116,62375001）
