Er-Doped Mode-Locked Fiber Laser With a Hybrid Structure of a Step-Index–Graded-Index Multimode Fiber as the Saturable Absorber

Wang, Zhaokun; Yang, Fan; Li, Liujiang; Chen, Zhao; Xu, Bingjie; Jin, Shangzhong; Cao, Shiying; Fang, Zhongyuan

doi:10.1109/jlt.2017.2768663

Cited by 115 publications

(36 citation statements)

References 38 publications

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“…Several different variants of the technique of fiber laser mode-locking based on nonlinear MMI have been demonstrated in recent years [16][17][18][19][20][21][22][23][24]. In order to test the nonlinear transmission of the SMS structure, the MMF was stretched, and the SMS transmission was measured as a function of the stretching length, for different input intensities [20].…”

Section: Introductionmentioning

confidence: 99%

“…This suggests that nonlinear mode coupling and the resulting beam reshaping could be a mode-locking mechanism, rather than the nonlinear variation of the self-imaging period. Indeed, experiments show that the excitation of high-order modes (HOMs) in the GRIN fiber is a necessary condition to obtain saturable absorber action [17,18]. A study of the impact of the GRIN core diameter (ranging from 20 to 62.5 µm) revealed that larger diameters (hence larger proportions of excited HOMs) increase the output laser power.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear beam self-imaging and self-focusing dynamics in a GRIN multimode optical fiber: theory and experiments

et al. 2020

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Beam self-imaging in nonlinear graded-index multimode optical fibers is of interest for many applications, such as implementing a fast saturable absorber mechanism in fiber lasers via multimode interference. We obtain a new exact solution for the nonlinear evolution of first and second order moments of a laser beam of arbitrary transverse shape carried by a graded-index multimode fiber. We have experimentally directly visualized the longitudinal evolution of beam self-imaging by means of femtosecond laser pulse propagation in both the anomalous and the normal dispersion regime of a standard telecom graded-index multimode optical fiber. Light scattering out of the fiber core via visible photo-luminescence emission permits us to directly measure the self-imaging period and the beam dynamics. Spatial shift and splitting of the self-imaging process under the action of self-focusing are also revealed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear beam self-imaging and self-focusing dynamics in a GRIN multimode optical fiber: theory and experiments

et al. 2020

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“…The bandwidth of the PC and MMF-induced spectral filter is given by Δ λ = 2 πλ /Δ ϕ 25 , where λ is the wavelength, and ϕ is the phase shift accumulated through MMF. By using large core MMF, the non-linear phase-shift in the cavity is reduced for a certain peak power 18 . Therefore, the bandwidth could be increased, which helps to the evolution between soliton and stretched-pulse.…”

Section: Discussionmentioning

confidence: 99%

“…However, self-imaging beat length of light propagating along a GIMMF is on the order of micrometers, so it is difficult to finely tune the length of a GIMMF in practice. To improve the SA based on MMF, Wang fused a segment of step-index multimode fiber (SIMMF) ahead of GIMMF in experiment 18 . Higher order modes of GIMMF were excited and an effective SA behavior was realized.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast soliton and stretched-pulse switchable mode-locked fiber laser with hybrid structure of multimode fiber based saturable absorber

Zhao

Wang

et al. 2018

Sci Rep

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We demonstrate an all-fiber mode locked laser based on hybrid structure of multimode fiber saturable absorber (SA) that can realize both conventional soliton and stretched-pulse states. Stable 16.44 MHz conventional soliton pulses are achieved by injecting 80 mW threshold pump power. By increasing the incident pump power to 420 mW, the laser evolves from soliton operation into stretched-pulse mode locking state. 310 fs stretched-pulse are obtained with the same repetition rate as the soliton pulses. The center wavelength and its 3 dB spectrum bandwidth are 1603 nm and 14.2 nm, respectively. For the first time, we experimentally confirm transition between conventional soliton and stretched-pulse in 1.5 μm mode-locked fiber laser by introducing multimode optical fiber SA. Moreover, the maximum single pulse energy of nearly 1 nJ is achieved. Such all-fiber mode-locked lasers based on hybrid structure of multimode fiber are attractive for practical applications without damage and the limitation of life time.

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“…Recently, the nonlinear switching properties or saturable absorber (SA) based on nonlinear multimode interference in graded-index multimode fiber (GIMF) has been widely investigated, which is superiority of low-cost, simple structure, and especially the ability in supporting extremely high damage threshold in high power double cladding fiber laser. It has already used as a saturable absorber in ultrashort fiber laser [14][15][16], however, there is no mode-locked square-wave pulse by adopting GIMF reported so far.In this paper, we firstly experimentally demonstrate the reverse saturable absorption effect in GIMF, which adopt our group proposed a new design of saturable absorber based on offset-spliced GIMF, and use it to output mode-locked square-wave pulse in Yb-doped fiber laser. In our fiber…”

mentioning

confidence: 99%

Generation of mode-locked square-shaped and chair-like pulse based on reverse saturable absorption effect of nonlinear multimode interference

Dong¹,

Lin²,

Li³

et al. 2019

Opt. Express

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Abstract：We firstly report mode-locked square-wave pulse in Yb-doped fiber laser based on graded index multimode fiber of reverse suturable absorption. By adjusting the pump power, the width of the square-wave can be tuned range from 350 ps to 52.6 ns with 3dB bandwidth spectrum of 0.73 nm. The supermode suppression ratio exceeds ~ 65 dB, which indicates excellent mode-locked operation state, and we also study the characteristic of pulse by the chirp measurement system. The mode-locked square-wave pulse fiber laser can sever as high power light source for industrial applications. IntroductionAll-fiber-format mode-locked laser has been widely applied among biomedicine, scientific research, and industry due to its compact structure, excellent beam quality and efficient pumping [1]. It is significant to increase the energy of single pulse for the practical application of laser. The traditional soliton pulse energy is limited by the theory of soliton area and is generally limited to the level of hundreds pJ [2]. Diverse approaches have been proposed such as stretched soliton and parabolic pulse, however, these solitons can only output at most a few tens of mJ [3][4][5]. Akhmediev theoretically investigated dissipative soliton resonance (DSR) pulse forming mechanics based on cubic-quintic Ginzburg-Landau equation (CGLE) [6]. The characteristic of the pulse is that the energy pulse could increase indefinitely as pump power increases while simultaneously the amplitude remains constant, which is represented in the time domain as flat-top or square-wave pulse. This idea attracted a lot of researches, which led to a large number of published research results and improved the pulse energy to the level of μJ [7-9].To date now, mode-locked square-wave pulse are generally generated based on the nonlinear amplifying loop mirror (NALM) technique [10][11][12], nonlinear polarization rotation (NPR) mechanism [13]. It is rarely reported that new materials are used as saturable absorbers to generate square-wave pulses due to the damage threshold of these materials is generally low, they cannot withstand large energy pulses. Recently, the nonlinear switching properties or saturable absorber (SA) based on nonlinear multimode interference in graded-index multimode fiber (GIMF) has been widely investigated, which is superiority of low-cost, simple structure, and especially the ability in supporting extremely high damage threshold in high power double cladding fiber laser. It has already used as a saturable absorber in ultrashort fiber laser [14][15][16], however, there is no mode-locked square-wave pulse by adopting GIMF reported so far.In this paper, we firstly experimentally demonstrate the reverse saturable absorption effect in GIMF, which adopt our group proposed a new design of saturable absorber based on offset-spliced GIMF, and use it to output mode-locked square-wave pulse in Yb-doped fiber laser. In our fiber

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Er-Doped Mode-Locked Fiber Laser With a Hybrid Structure of a Step-Index–Graded-Index Multimode Fiber as the Saturable Absorber

Cited by 115 publications

References 38 publications

Nonlinear beam self-imaging and self-focusing dynamics in a GRIN multimode optical fiber: theory and experiments

Nonlinear beam self-imaging and self-focusing dynamics in a GRIN multimode optical fiber: theory and experiments

Ultrafast soliton and stretched-pulse switchable mode-locked fiber laser with hybrid structure of multimode fiber based saturable absorber

Generation of mode-locked square-shaped and chair-like pulse based on reverse saturable absorption effect of nonlinear multimode interference

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