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Observation the Multi-Soliton Patterns From the Er-Doped Mode-Locked Fiber Laser Modulated by PtSe2
摘要： The passively mode-locked ?ber laser modulated by low-dimensional materials can provide an ideal platform to investigate the soliton dynamics. Here, we experimentally explored the soliton formation and evolution from an erbium-doped ?ber laser mode-locked by mechanically exfoliated PtSe2 saturable absorber via evanescent ?eld interaction. With the increasing pump power, different soliton patterns, such as single soliton, two solitons, and bound soliton, can be observed experimentally. The experimental results can identify the non-linear optical response of the PtSe2 and may make avenue toward unveiling the nature of the soliton dynamics in the ?ber laser system.
关键词： non-linear optics,soliton dynamics,?ber laser,mode-locking,saturable absorber
更新于2025-09-23 15:21:01
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Period Doubling of Dissipative-Soliton-Resonance Pulses in Passively Mode-Locked Fiber Lasers
摘要： Period-doubled dissipative-soliton-resonance (DSR) pulses are numerically investigated in a Yb-doped ?ber laser based on non-linear amplifying loop mirror (NALM). In the case of low pump power, stationary dissipative solitons with uniform pulse peak power are obtained in the laser. Further increasing the pump power, the laser operates in the DSR regime, where the phenomenon of period-doubling bifurcations could occur. In a period-doubled state, the pulse peak power returns back to its original one every two cavity roundtrips while the pulse duration remains almost the same. We analyze the effects of cavity parameters on the DSR-pulse features under the dynamic bifurcations. It is found that the saturation power of NALM plays a dominant role in the formation of period-doubled DSR pulses. Our simulation results are conducive to enriching the dynamics of DSR pulses in non-linear systems.
关键词： non-linear amplifying loop mirror,dissipative soliton resonance,?ber laser,period doubling,soliton dynamics
更新于2025-09-19 17:13:59
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Visualizing the a??Invisiblea?? Soliton Pulsation in an Ultrafast Laser
摘要： Pulsation is a universal phenomenon that exists in diverse fields. For nonlinear optics, the soliton pulsating behavior can be meaningful for fundamental physics and industrial purpose owing to its fruitful nonlinear dynamics and the possible detrimental effect of instability (or even route to chaos) during pulsating process. Herein, a novel type of soliton pulsation in an ultrafast laser is unveiled. The pulsating behavior features that the soliton experiences periodic peak power variation but with almost invariable pulse energy. This phenomenon is denoted as “invisible soliton pulsation” when referring to the routine diagnostic methods. However, the invisible soliton pulsation can be distinguished by recording the shot-to-shot spectra with real-time spectroscopy technique. It is found that the appearance of the invisible soliton pulsation is sensitive to the pump power level. Moreover, the phenomenon of invisible soliton pulsation is further revealed by numerical simulations. These findings can shed new insights into the complex nonlinear behavior of solitons in dissipative optical systems, and also enrich the performance diagnostic of ultrafast lasers for practical applications.
关键词： soliton dynamics,ultrafast lasers,soliton pulsation
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Soliton Self-Compression and UV Dispersive Wave Emission in Compact Hollow Capillary Systems
摘要： Soliton dynamics underlie a wide range of phenomena in nonlinear fibre optics. In particular, higher-order solitons in gas-filled hollow-core photonic crystal fibre (HC-PCF) have been applied to self-compression of ultrafast laser pulses [1] and the generation of widely tuneable resonant dispersive waves (RDW) from the vacuum ultraviolet (VUV) to the visible spectral range [2]. We recently demonstrated that by moving to long, large-core hollow capillary fibres (HCF) and shorter driving pulses, these effects can be scaled by up to three orders of magnitude in pulse energy, providing unprecedented peak power in ultrafast VUV pulses as well as a route towards terawatt-scale optical attosecond pulses [3]. Here we show that by further decreasing the initial pulse duration, high-energy soliton dynamics can be obtained in HCF as short as 35 cm.
关键词： Soliton dynamics,ultrafast laser pulses,hollow-core photonic crystal fibre,nonlinear fibre optics,resonant dispersive waves
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Build-Up of Bidirectional Ultrashort Pulse Laser Generation: From Q-Switched Instabilities to Mode-Locking
摘要： Development of new technologies in electronics has made it possible to observe real-time spectral evolution of ultrashort pulses via time-stretching techniques [1]. These experimental methods complement the theoretical completed work on the rich build-up dynamics of solitons in ultrafast lasers [2, 3]. In this work, we have obtained the formation dynamics of counter-propagating solitons in a bidirectional hybrid mode-locked erbium-doped fibre laser using the dispersive Fourier transform (DFT) technique [4]. The bidirectional ring Erbium-doped fibre laser, adopted from [5] is mode-locked via the co-action of single-walled carbon nanotube and non-linear polarization rotation. The laser generates near transform-limited 790 and 570 fs soliton pulses at 14.78 MHz repetition rate with ~1 mW output power. Real-time dynamics were evaluated using a pair of 50-GHz fast photodetector and a 33 GHz real-time digital storage oscilloscope. The DFT is realised in the dispersion compensated fibre (DCF) with overall dispersion of D = -1200 ps/nm. DFT resolution is determined by the total accumulated dispersion and limited by the fundamental Fourier limit to Δλ = 0.28 nm [4]. We have observed soliton formation in frequency domain for both clockwise (CW) and counter-clockwise (CCW) directions. The whole bidirectional pulses formation takes almost 62000 roundtrips from first modulation instabilities until stable ultrafast bidirectional regime is established. Fig. 1a shows real-time spectrum formation for both pulses from 60100 to 62900 roundtrips, when the stable mode-locking is established in both directions. The whole formation dynamics differ from the earlier demonstrated in unidirectional lasers in [2, 3]. The generation starts from characteristic modulation instabilities, which spectral bandwidth rapidly increase, transforming to Q-switched generation (Fig. 1b). Bound soliton formation and unstable mode-locking generation observed before stable mode-locking regime is occurred (Fig. 1e) from unstable Q-switched generation. We believe that obtained results would constitute a basis for the further investigations of counter-propagating soliton dynamics and interactions in bidirectional fibre laser cavities and the role of Q-switched instabilities in mode-locking regime formation.
关键词： mode-locking,bidirectional,ultrashort pulse laser,Q-switched instabilities,soliton dynamics
更新于2025-09-11 14:15:04