Saturable absorber based on a single mode fiber – graded index fiber – single mode fiber structure with inner micro-cavity

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

doi:10.1364/oe.26.000927

Cited by 77 publications

(26 citation statements)

References 31 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%

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%

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

et al. 2020

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“…By introducing a microcavity with length of 45 μm, SMF-GIMF-SMF structure without stretching behaved saturable absorption with 1.9% modulation depth, as shown in Fig. 8(a) [69]. This structure eliminated effectively the demand of precisely process of L GIMF and had a high stability for mode-locking operation at fundamental frequency.…”

Section: Er-doped Fiber Lasersmentioning

confidence: 96%

All-Fiber Saturable Absorbers for Ultrafast Fiber Lasers

Zhao

Chen

et al. 2019

IEEE Photonics J.

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The past decade has witnessed tremendous achievements of ultrafast fiber laser technologies due to rapid developments of saturable absorbers (SAs) based on, in particular, nanomaterials such as 0D quantum dot, 1D carbon nanotubes, 2D layered materials, and 3D nanostructures. However, most of those nanomaterials-based SAs are inevitably absence of the high damage threshold and all-fiber integration, therefore challenging their applications on highly integrated and high-energy pulse generations. Recently, the real all-fiber SAs based on the nonlinear multimodal interference (NLMMI) technique using multimode fibers are demonstrated to overcome the above limitations. In this review, a detailed summary of the recent advances in NLMMI-based all-fiber SAs is provided, including the fundamental theory, implementation scenarios, and ultrafast fiber lasers of the all-fiber SAs, covering wide wavelength range of 1, 1.55, and 2 μm. In addition to the state-of-the-art overview, optical rogue waves in the all-fiber SA-based ultrafast fiber laser are extensively analyzed, which reveals the laser physics behind the dynamics from low-energy to high-energy pulses and directs the design of high-energy ultrafast fiber lasers. The conclusions and perspectives of the all-fiber SAs are also discussed at the end.

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“…This ultrafast optical switch realized by changing the coupling efficiency not only does this independent of polarization state, but also has a high damage threshold. Modelocking based on NL-MMI has been successfully applied to traditional mode-locking, dissipative soliton mode-locking, and Q-switching [21][22][23][24][25][26] . In the previous study of our group, this method is also used to achieve HML by introducing 150 m long SMF in the cavity [27] .…”

Section: Introductionmentioning

confidence: 99%

“…In the previous study of our group, this method is also used to achieve HML by introducing 150 m long SMF in the cavity [27] . However, the long cavity seriously affects the stability of HML, and the precise control of the length of MMF limits the mode-locking based on the NL-MMI [28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Harmonic mode-locked fiber laser based on microfiber-assisted nonlinear multimode interference

et al. 2022

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A novel harmonic mode-locked fiber laser based on nonlinear multimode interference (NL-MMI) in a microfiber-assisted ultrafast optical switch is proposed in this Letter. The microfiber-assisted ultrafast optical switch can be obtained by tapering the splicing point of the graded-index multimode fiber (GIMF) and single-mode fiber, which not only helps to shorten the self-imaging period in GIMF to relax the strict requirement of NL-MMI on the length of multimode fiber, but also improves the harmonic order. In the experiment, with the waist diameter of ∼15 μm, the repetition rates of the fiber laser can be stably locked at 285 MHz, corresponding to the 16th-order harmonic mode-locking, with the pulse duration of 1.52 ps. Our results provide novel insight into the design of a high-repetition-rate laser and the application of microfibers in the modelocking device.

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Saturable absorber based on a single mode fiber – graded index fiber – single mode fiber structure with inner micro-cavity

Cited by 77 publications

References 31 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

All-Fiber Saturable Absorbers for Ultrafast Fiber Lasers

Harmonic mode-locked fiber laser based on microfiber-assisted nonlinear multimode interference

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