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-switching bifurcation dynamics of passively mode-locked lasers

Akhmediev, Nail; Soto-Crespo, J. M.

doi:10.1103/physreve.104.024221

Cited by 3 publications

(2 citation statements)

References 52 publications

(63 reference statements)

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“…The complex Ginzburg-Landau equation is a typical model of weakly nonlinear dissipative systems and one of the most studied nonlinear equations in physics, which can be used to describe a wide variety of nonlinear phenomena, such as nonlinear photonics, dynamic phase changes, superconductivity, superfluid, fluid dynamics, plasma, Bose-Einstein condensation, liquid crystals, field theory strings and so on [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In its most basic forms, the complex Ginzburg-Landau equation includes the cubic nonlinearity [1] and has the following form [3] (…”

Section: Introductionmentioning

confidence: 99%

“…As a model to simulate dissipative systems, CCQGLEs have been used in many nonlinear optical works, such as mode-locked laser [21,22], superconductivity [23], Bose-Einstein condensation [24], superfluidity [25], binary fluid convection [26], surface reactions [27] and so on [11][12][13][28][29][30][31][32]. Furthermore, in order to better reflect the complexities and variabilities of the dissipative systems, it is indispensable to choose the FCCQGLEs with variable coefficients as the theoretical models.…”

Section: Introductionmentioning

confidence: 99%

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Exact solutions to the fractional complex Ginzburg-Landau equation with cubic-quintic and Kerr law nonlinearities

Yang,

Gao

2024

Phys. Scr.

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The fractional complex cubic-quintic Ginzburg-Landau equation (FCCQGLE) with variable coefficients is a propagation model of optical pulses in optical fibers, the quintic term contained in it not only explains the physical significances that are not found in the existing models, but also has more abundant dynamic characteristics compared with lower dimensional systems. In this paper, the exact solutions of this equation are obtained via the appropriate transformations methods, which also are divided into different kinds. More precisely, we acquire the solitary, soliton and elliptic waves solutions by using the improved unified method, the bright and dark solitons solutions by using the improved F-expansion method, as well as the traveling wave solutions through the improved ( G ′ / G 2 ) -expansion and Bernoulli sub-equation function methods. Furthermore, we draw the 3D, 2D, density and contour plots to understand the propagation forms and the changes of amplitudes, frequencies and shapes of the solutions for the FCCQGLE with variable coefficients. The last thing worth mentioning is that the improved unified method here extends the degree of the polynomial from n to -n in the hypothetical solutions, which is not appeared before.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exact solutions to the fractional complex Ginzburg-Landau equation with cubic-quintic and Kerr law nonlinearities

Yang,

Gao

2024

Phys. Scr.

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Spatiotemporal Period-Doubling Bifurcation in Mode-Locked Multimode Fiber Lasers

et al. 2022

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Spatiotemporal mode-locked (STML) lasers are ideal platforms for investigating high-dimensional nonlinear dynamics. This study presents an experimental observation and theoretical investigation of a novel high-dimensional nonlinear dynamics, which we term spatiotemporal period-doubling bifurcation (SPB), in the STML lasers. In the SPB state, not only the temporal shape but also the spatial beam (i.e., the spatiotemporal structure) of the pulses exhibit period-doubling bifurcation. As a result, it is observed that the pulse train modulation varies with the transverse mode, and the output beam profile fluctuates rapidly and periodically. Our numerical simulations are in good agreement with the experimental observations. In addition, a simple iterative model is presented to underline the physical insights of SPB, by considering the mode-dependent saturable absorption effect. Based on these results, spatial-dependent saturable absorption is believed to be the key factor for the unique spatiotemporal characteristic of SPB in multimode lasers. This study contributes to the understanding of the complex spatiotemporal dynamics in STML multimode lasers and to the discovery of novel dynamics in high-dimensional nonlinear systems.

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Passively Q-switched fiber laser based on Sb2S3 saturable absorber

Yao¹,

Liu²,

Tan³

et al. 2022

Advanced Lasers, High-Power Lasers, and Applications XIII

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Q-switched laser is one of the important techniques to achieve high-energy laser pulses and greatly promotes the development and application of the field of optical engineering. With the modulation of cavity loss by optical switch in the laser cavity, the energy output by the laser is compressed into a pulse with a very short duration. For passively Q-switched lasers, saturable absorbers (SAs) with nonlinear saturable absorption are commonly used as optical switches.In recent years, 2D materials are used widely as SAs, such as topological insulators, black phosphorous, transition metal dichalcogenides and transition metal oxides. As one of the TMDs, the antimonous sulfide (Sb2S3) with smaller band gap as well as excellent nonlinear optical properties is a promising SA material. In this paper, we demonstrate a passively Q-switched erbium-doped fiber laser based on Sb2S3 SA, which could generate stable short pulses. By utilizing the Sb2S3 SA fabricated with optical deposition method, an all-fiber cavity is built. In the experiment, a stable Q-switched pulse trains with a repetition frequency of 30 kHz, a central wavelength of 1558.4 nm and a pulse width of 6.4 μs are obtained at a 980 nm pump power of 35 mW. The signal-to-noise ratio of radio-frequency spectrum at the fundamental frequency is about 50 dB, indicating the high stability of the Q-switched pulse. To the best of our knowledge, this is the first demonstration of Q-switched fiber laser based on Sb2S3 material, which could contribute as a new potential SA material for pulsed fiber lasers.

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Q -switching bifurcation dynamics of passively mode-locked lasers

Cited by 3 publications

References 52 publications

Exact solutions to the fractional complex Ginzburg-Landau equation with cubic-quintic and Kerr law nonlinearities

Exact solutions to the fractional complex Ginzburg-Landau equation with cubic-quintic and Kerr law nonlinearities

Spatiotemporal Period-Doubling Bifurcation in Mode-Locked Multimode Fiber Lasers

Passively Q-switched fiber laser based on Sb2S3 saturable absorber

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