Narrow bandwidth Q-switched Erbium-doped fiber laser based on dynamic saturable absorption filtering effect

Wen, Zengrun; Wang, Kaile; Chen, Shuangcheng; Chen, Haowei; Qi, Xinyuan; Lu, Baole; Bai, Jintao

doi:10.1016/j.optlastec.2021.107045

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…This difference seriously affects the absorption and reflection properties of DPG. Additionally, using a heavily doped fiber for the saturable absorber enables the formation of Q-switched regimes [33]. The SMF in the linear part of the cavity is ∼5 m longer than in the previous architecture, enabling the control of oscillating modes [16].…”

Section: Methodsmentioning

confidence: 99%

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Observation of Q-switched and continuous wave regimes with mode-hopping in Er-doped fiber lasers incorporating a dynamic population grating

Wen¹,

Fan²,

Wang³

et al. 2023

Preprint

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Dynamic population gratings (DPGs) in rare-earth doped fibers are prevalent devices in fiber lasers for the production of single-longitudinal-mode emission, Q-switched pulses, and wavelength self-sweeping regimes. This study presents a transition from Q-switched state to continuous wave (CW) state, accompanying irregular mode-hopping, in an erbium-doped fiber laser with a heavily-doped DPG centered at 1549.95 nm. Our results demonstrate that the transition between these two states can be achieved by adjusting the pump power. The repetition frequency of the Q-switched pulse increases monotonically with the increasing pump power, while the pulse duration initially narrows and then expands because the reduced peak intensity weakens the nonlinear effect. Additionally, modulation peaks are evident on both the Q-switched pulse train and the CW background, which are induced by the irregular mode-hopping caused by the DPG. Furthermore, we observe that the central wavelength fluctuates within a range of 0.05 nm. These results provide valuable insight into the DPG effect in heavily-doped fibers.

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Section: Methodsmentioning

confidence: 99%

“…In addition, DPG in heavily doped fiber enables the pulsed regime due to the nonradiative transition induced by active-ion clusters [30][31][32]. Such DPG makes it possible to achieve Q-switched or mode-locked pulses with narrow linewidth [33].…”

Section: Introductionmentioning

confidence: 99%

Observation of Q-switched and continuous wave regimes with mode-hopping in Er-doped fiber lasers incorporating a dynamic population grating

Wen¹,

Fan²,

Wang³

et al. 2023

Preprint

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“…The full width at half maximum (FWHM) of the main peak of the reflectivity curve can approximately be calculated as [20,21]:…”

Section: Unpumped Er-doped Fiber Sagnac Loop Filtermentioning

confidence: 99%

Narrow linewidth single mode fiber laser with double unpumped EDF Sagnac loops filter

Wan¹,

Gu²,

Wang³

et al. 2022

Laser Phys. Lett.

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In this paper, we proposed a narrow linewidth single longitudinal mode (SLM) fiber laser, which was realized by employing a double unpumped erbium doped fiber (EDF) Sagnac loops structure. The Sagnac loops formed self-injected fiber Bragg gratings (FBG) and helped SLM selection, while the saturable absorption in unpumped EDF was used to compress the output laser linewidth. Connecting two unpumped EDF Sagnac loops in sequence was analyzed theoretically and tested experimentally, which would lead to narrower output laser linewidth. Under a pump power of 200 mW, we obtained an output linewidth of 858 Hz and a power stability of 0.32 dB/30 min. This structure provided a simple and low-cost way of generating narrow linewidth stable SLM laser.

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“…The saturable absorption effect of an erbium-doped fiber (EDF) in an erbium-doped gain fiberbased cavity has not been studied extensively. Wen et al have developed a saturable dynamic induced grating using a segment of EDF and a fiber Bragg grating to obtain an output with narrow spectral width in an EDF-based cavity [30]. This aforementioned cavity has delivered pulses of duration 1.2 µs with maximum pulse energy of 0.3 µJ.…”

Section: Introductionmentioning

confidence: 99%

Generation of stable Q-switched pulses at 1566 nm by using a segment of erbium-doped fiber as saturable absorber

Samanta¹,

Chowdhury²,

Paul³

2022

Laser Phys.

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In this manuscript, the performance of a passively Q-switched fiber laser has been presented, where a segment of un-pumped erbium-doped fiber (EDF) is used as the saturable absorber (SA). We have taken an erbium and ytterbium (Er/Yb) co-doped double cladding fiber as the gain media for efficient pump absorption and checked the potential of the laser by changing the length of the in-house fabricated erbium-doped fiber saturable absorber (EFSA). For a fixed length of EFSA, variation of important system parameters such as output power, repetition rate, pulse width, etc, with the change of the pump power has also been reported. The laser has delivered pulses of a minimum duration of 1.35 µs with maximum energy of 2.8 µJ. The repetition rate varies in the range from 24.8 kHz to 47 kHz with alteration of the length of the SA. The central wavelength of the output spectra is 1566 nm.

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Narrow bandwidth Q-switched Erbium-doped fiber laser based on dynamic saturable absorption filtering effect

Cited by 9 publications

References 32 publications

Observation of Q-switched and continuous wave regimes with mode-hopping in Er-doped fiber lasers incorporating a dynamic population grating

Observation of Q-switched and continuous wave regimes with mode-hopping in Er-doped fiber lasers incorporating a dynamic population grating

Narrow linewidth single mode fiber laser with double unpumped EDF Sagnac loops filter

Generation of stable Q-switched pulses at 1566 nm by using a segment of erbium-doped fiber as saturable absorber

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