Peak-Power-Clamped Passive Q-Switching of a Thulium/Holmium Co-Doped Fiber Laser

Zhao, Junqing; Li, Lei; Zhao, Luming; Tang, Dingyuan; Shen, Deyuan

doi:10.1109/jlt.2018.2866207

Cited by 8 publications

(5 citation statements)

References 20 publications

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“…It takes enough time to build a dynamic grating for SLM selection based on a saturated absorber, and next we will discuss how to balance the stable SLM operation and pulse generation. As we know, the build-up and disappearance time of a dynamic grating built up from an unpumped doped fiber is determined by the excited-state lifetime of the doped ions [33]. This experiment was performed using ytterbium-doped fiber as a saturable absorber for single-frequency mode selection, and the excited-state lifetime of ytterbium ions is about ms level.…”

Section: Resultsmentioning

confidence: 99%

Single-Frequency Linearly-Polarization Q-Switched Nanosecond Fiber Ring-Cavity Laser Enabled by an Electro-Optic Modulator

Chen

Zhang

et al. 2023

IEEE Photonics J.

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We report a single-frequency linearly-polarized nanosecond fiber ring-cavity laser based on an electro-optic modulator. A 0.08-nm-bandwidth fiber Bragg grating combined with a section of 1-m unpumped Yb-doped fiber act as an ultra-narrow bandwidth filter to realize single-frequency laser output. The devices used in the experiments are all polarization-maintaining to ensure the linearly-polarized laser output. Pulsed laser is obtained by using electro-optic modulator to adjust the loss in the laser cavity periodically. And the repetition rate of pulse trains can be flexibly changed from 550 to 1000 kHz with a pulse width of 27-59 ns. By varying the amplitude of the arbitrary function generator, we obtained a single-frequency pulsed laser output with a pulse width of 51-493 ns. The linewidth of the laser is 31.8 MHz, and the polarization extinction ratio was better than 20 dB.

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Section: Resultsmentioning

confidence: 99%

Single-Frequency Linearly-Polarization Q-Switched Nanosecond Fiber Ring-Cavity Laser Enabled by an Electro-Optic Modulator

Chen

Zhang

et al. 2023

IEEE Photonics J.

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“…In Ref. [25], the peak-power-clamping Q-switched (PPC-QS) operation with NPR technique has been reported firstly, and the pulse peak power can stay at a constant level as the rising of the pump power. The repetition rate of FT-QML varying continuously with pump power implies that the FT-QML has a typical feature of all Q-switched operation.…”

Section: Resultsmentioning

confidence: 99%

“…It is worth mentioning that a type of peak-power-clamping (PPC) effect in passive Q-switched regime can be achieved in the NPR thulium/holmium co-doped fiber laser by intracavity-incorporating a segment of highly nonlinear fiber (HNLF) and launching high-enough pump power in Ref. [25]. This work has a greater benefit for the deeper understanding of the formation of the Q-switched operation.…”

Section: Introductionmentioning

confidence: 99%

Generation of Flat-Top Q-Switched Envelope Dissipative Soliton Resonance Pulse in Passively Mode-Locked Fiber Laser

Han

Liu

et al. 2020

IEEE Photonics J.

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We present demonstration of an erbium-doped fiber laser based on the nonlinear amplifying loop mirror mechanism, with a stable phenomenon of flat-top Q-switched mode-locked (FT-QML) dissipative soliton resonance (DSR) pulse, for the first time. In the experiment, we can observe both the flat-top Q-switched envelope and square-wave pulse by the peak power clamping effect inside the cavity. The characteristics of both continuous DSR pulse and flat-top Q-switched mode-locked square-wave are analyzed comprehensively. With the maximum pump power of 363 mW, single pulse energy in the FT-QML envelope can be up to 14 nJ as three times high as the one of continuous DSR. Essentially, the temporal width of the Q-switched mode-locked envelope can reach 4.6 µs with flat-top duration of 3.5 µs. The amplitude fluctuation of the sub-pulse inside the flat-top is stable at about 0.12% by using the formula of RMSE. Therefore, the laser can provide flat-top burst mode pulse sequence, and the pulse width can be controlled by tuning the pump power.

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“…For example, a chairlike pulse, consisting of a long flattop portion in the leading part and a following high-peak-power short pulse, is demonstrated to be capable of improving laser-machining efficiency and quality, as the initial long pulse can contribute to the preheating of the materials and the subsequent short intense pulse induces the direct ablation of the materials. Recently, another type of h-shaped pulses was generated in a thuliumholmium-doped MLFL, which shows similar characteristics with the DSR pulses in terms of the peak-power-clamping 29) induced wave-breaking-free property and the pump-powerdependent duration. [30][31][32] In this paper, we experimentally demonstrate the generation of another novel h-shaped pulse with a tunable leading portion from a Tm-doped MLFL at 1.973 μm based on the nonlinear polarization rotation (NPR) technology.…”

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confidence: 85%

H-shaped pulse generation with tunable leading edge from a Tm-doped mode-locked fiber laser

He¹,

Chen²,

Deng³

et al. 2019

Appl. Phys. Express

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A novel h-shaped pulse train with a tunable leading-edge (resembling a h-shaped pulse merging with a weak square pulse) is experimentally generated in a Tm-doped mode-locked fiber laser (MLFL) incorporating a 100 m highly nonlinear fiber. Through carefully adjusting the pump power and cavity polarization states, the leading-edge duration of the obtained h-shaped pulse can be widely tuned from zero (corresponding to the typical conventional h-shaped pulse train) to 567.8 ns (equivalent to the cavity roundtrip time). Our results can further facilitate understanding the intrinsic mechanism and characteristics of novel h-shaped pulse dynamics in MLFLs.

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Peak-Power-Clamped Passive Q-Switching of a Thulium/Holmium Co-Doped Fiber Laser

Cited by 8 publications

References 20 publications

Single-Frequency Linearly-Polarization Q-Switched Nanosecond Fiber Ring-Cavity Laser Enabled by an Electro-Optic Modulator

Single-Frequency Linearly-Polarization Q-Switched Nanosecond Fiber Ring-Cavity Laser Enabled by an Electro-Optic Modulator

Generation of Flat-Top Q-Switched Envelope Dissipative Soliton Resonance Pulse in Passively Mode-Locked Fiber Laser

H-shaped pulse generation with tunable leading edge from a Tm-doped mode-locked fiber laser

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