Robust Q-switching based on stimulated Brillouin scattering assisted by Fabry-Perot interference

Hou, Senlin; Yang, Lei; Zhao, Nan; Chen, Pïng; Zhang, Fangfang; Yang, Chen; Lin, Feng; Li, Jinyan; Yang, Lüyun; Peng, Jinggang; Li, Haiqing; Dai, Nengli

doi:10.1364/oe.27.005745

Cited by 10 publications

(6 citation statements)

References 37 publications

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“…Furthermore, defining a threshold for these two phenomena principally does not make sense in AQS‐FL systems while they show very diverse and irregular behavior. According to different simulations and comparing to the experimental results of other researchers, [ 16,17,28,29,33–37 ] we can express that the SBS is a more serious problem in fiber lasers because the red shift caused by SBS is negligible, hence the Stokes modes enjoy almost the same conditions that are provided for the main lasing component. As such, they can be dramatically amplified to a level that can completely exhaust the energy of the main pulse.…”

Section: The Stimulated Raman Scattering (Srs)mentioning

confidence: 76%

“…It should be emphasized that a term for spontaneous emission impact on Stokes components is needed here. [ 28,29 ] A quantitative estimation of this impact on the Stokes components can be performed by utilizing an enhancement/reduction factor or coefficient that is multiplied by a spontaneous emission term. This factor can be dependent on a number of other nonlinear phenomena too, such as four wave mixing, [ 29 ] thus a proportionality coefficient based on the lab experiments can be fitted to our model and AI algorithm by design to account for the enhancement or reduction of the ASE effect; for instance in Equation (13) we have used a coefficient of unity.…”

Section: The Stimulated Brillouin Scattering (Sbs)mentioning

confidence: 99%

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Suppression of the Stimulated Brillouin and Raman Scattering in Actively Q‐switched Fiber Lasers through Temporal Pulse Shaping

et al. 2021

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Despite the wide range of applications and versatility, actively Q‐switched fiber lasers (AQS‐FLs) suffer from the multi‐peak phenomenon or stepwise pulse generation under certain conditions. As such, the advantage of the stepwise tendency in AQS‐FL to modify the pulse shape and create a temporal profile that minimizes the power of stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) Stokes components is taken. Accordingly a multi‐objective genetic algorithm (GA) and a Monte‐Carlo method is developed to solve the improved model for SBS. Additionally, the suppression of SRS is predicted and examined successfully. The proposed method is deployed for the simulation of the 5 and 10 kW peak and 10 ns wide pulses on a 4 m long, single‐mode, ytterbium‐doped double clad fiber under the narrow linewidth of 0.05 nm with promising suppression of SBS and SRS effects. To the best of the authors' knowledge this is the first time that such a pulse‐shaping strategy is demonstrated for the SBS or SRS suppression. Furthermore reaching a 10 kW peak on single mode fibers was previously only possible via custom made fibers. Our novel method offers the possibility of optimizing and improving the utilization of different fiber types in AQS‐FL systems.

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Section: The Stimulated Raman Scattering (Srs)mentioning

confidence: 76%

Section: The Stimulated Brillouin Scattering (Sbs)mentioning

confidence: 99%

Suppression of the Stimulated Brillouin and Raman Scattering in Actively Q‐switched Fiber Lasers through Temporal Pulse Shaping

et al. 2021

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“…One of the most important features of SBS lasing relates to contribution of multi-order Stokes components in SBS pulse evolution, the effect recently theoretically studied in ref. [30], [31] and experimentally observed in a multi-pass YDF based amplifier, seeded by a DFB laser; see ref. [27].…”

Section: Resultsmentioning

confidence: 91%

Coexistence of Quasi-CW and SBS-Boosted Self-Q-Switched Pulsing in Ytterbium-Doped Fiber Laser With Low Q-Factor Cavity

Barmenkov

Muniz-Cánovas

Kir’yanov

et al. 2020

J. Lightwave Technol.

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We report the results of an experimental study of an ytterbium-doped fiber laser with low Q-factor cavity. We demonstrate that the laser operates in two randomly alternating sub-regimes, quasi-CW (QCW) and self-Q-switching (SQS), the latter ignited by stimulated Brillouin scattering (SBS). We show that probability of each sub-regime depends on pump power: QCW dominates slightly above the laser threshold while SQS pulsing prevails at higher pump powers. We also discuss the featuring details of QCW sub-regime and its role in instabilities (jittering) of SBS-boosted SQS pulsing as well as the statistical properties of the latter.

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“…In a recent publication, it has been demonstrated numerically and experimentally that the random output can be efficiently self-stabilized by inserting a Fabry-Perot (FP) interferometer into cavity [13]. But the pulse width was widened and the peak power was reduced in the results of simulations and they were verified in experiments.…”

Section: Introductionmentioning

confidence: 98%

A Novel Repetition Rate Adjustable SBS-Based Q-Switched Fiber Laser

et al. 2020

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We experimentally demonstrated a novel repetition rate adjustable SBS-based Q-switched fiber laser. An inserted Fabry-Perot interferometer formed by two non-contact end faces of two FC/PC fiber connectors was inserted to help the system stabilize the random output of SBS-based Q-switching. By mechanically fine-tuning the length of the inserted Fabry-Perot interferometer, a linear and continuous repetition rate adjustment under a fixed pump power was achieved. This method paves a new way for the indirect control of repetition rate in SBS-based Q-switched fiber lasers. It is also found out that higher pump power allows wider adjustment range. At 600 mW pumping which is highest pump power of the source, the repetition rate almost tripled from 11.22 kHz to 32.06 kHz only by varying the length of FP cavity in less than 3 µm. In the meantime, the variation of pulse width, output power and single pulse energy were recorded and analyzed under different fixed pump powers. Although the adjusting range of repetition rate is not very wide but the tuning of repetition rate due to such a small length changing is unique and valuable. This original repetition rate control technique has great potential in areas like environment sensing and material detections.

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Robust Q-switching based on stimulated Brillouin scattering assisted by Fabry-Perot interference

Cited by 10 publications

References 37 publications

Suppression of the Stimulated Brillouin and Raman Scattering in Actively Q‐switched Fiber Lasers through Temporal Pulse Shaping

Suppression of the Stimulated Brillouin and Raman Scattering in Actively Q‐switched Fiber Lasers through Temporal Pulse Shaping

Coexistence of Quasi-CW and SBS-Boosted Self-Q-Switched Pulsing in Ytterbium-Doped Fiber Laser With Low Q-Factor Cavity

A Novel Repetition Rate Adjustable SBS-Based Q-Switched Fiber Laser

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