Spectral and temporal dynamics of ultrashort pulses in a holmium-doped fibre amplifier

Filatova, Serafima A.; Kamynin, V. A.; Zhluktova, I. V.; Trikshev, A. I.; Arutyunyan, N. R.; Rybin, Maxim; Obraztsova, E. D.; Batov, Daniil; Voropaev, Vasilii; Цветков, В. Б.

doi:10.1070/qel17162

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…In this particular model the total gain varies through the saturation power and, thus, defines the average power 34 . A stable generation regime with a time window size of 20 ps and www.nature.com/scientificreports/ the number of the grid points of 2 11 is achieved. It should be noted that the temporal and spectral resolutions of this numerical model is 10 fs and 50 GHz, respectively, however, during the analysis of the output power distributions in both spectral and temporal domain, they were interpolated with an increased resolution (in 100 times) leading to the decreased temporal and frequency grid step to 0.1 fs and 0.05 GHz.…”

Section: Experimental and Numerical Resultsmentioning

confidence: 97%

“…The diversity of mode-locking mechanisms with high performance in the desired spectral region around —such as nonlinear polarisation evolution (NPE) 4 – 6 , nonlinear loop mirror 7 , 8 , single wall carbon nanotubes (SWCNT) 9 – 11 , 12 , SESAM 13 – 15 , 16 , graphene 17 —allows to achieve ultrashort pulses with required duration, power level along with high stability and regime repeatability. A huge variety of generation regimes were achieved in Tm-doped fibre systems, such as: soliton 7 , 10 , 11 , 15 , 17 – 21 , stretched pulse 5 , 6 , 9 , 10 , 15 , 22 , dissipative soliton 4 , 8 – 10 , 13 , 15 , 23 , 24 , noise-like pulse 14 , 23 , 25 and bound solitons 12 , 16 , 26 . Soliton Tm-doped fibre lasers have relatively narrow spectral width and, thus, long pulse duration compared with stretched-pulse lasers.…”

Section: Introductionmentioning

confidence: 99%

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Numerical model of hybrid mode-locked Tm-doped all-fibre laser

Donodin

Voropaev

Batov

et al. 2020

Sci Rep

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Ultrafast Tm-doped fibre lasers have been actively studied for the last decade due to their potential applications in precise mid-IR spectroscopy, LIDARs, material processing and more. The majority of research papers is devoted to the comparison between a numerical modelling and experimental results; however, little attention is being paid to the comprehensive description of the mathematical models and parameters of the active and passive components forming cavities of Tm-doped all-fibre lasers. Thus, here we report a numerical model of a stretched-pulsed Tm-doped fibre laser with hybrid mode-locking and compare it with experimental results. The key feature of the developed numerical model is employment of the experimentally measured dispersion coefficients and optimisation of some model parameters, such as the bandwidth of the spectral filter spectral filtering and the saturation power of the active fibre, for a conformity with the experiment. The developed laser emits 331.7 fs pulses with a 23.8 MHz repetition rate, 6 mW of average power, 0.25 nJ of pulse energy, and a 21.66 nm spectral bandwidth at a peak wavelength of 1899.5 nm. The numerical model characteristics coincide with experimentally achieved spectral width, pulse duration, and average power with inaccuracy of 4.7%, 5.4%, and 22.9%, respectively. Moreover, in the discussion of the work the main possible reasons influencing this inaccuracy are highlighted. Elimination of those factors might allow to increase accuracy even more. We show that numerical model has a good agreement with the experiment and can be used for development of ultrafast Tm-doped fibre laser systems.

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Section: Experimental and Numerical Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Numerical model of hybrid mode-locked Tm-doped all-fibre laser

Donodin

Voropaev

Batov

et al. 2020

Sci Rep

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“…The unique all-fiber Holmium master oscillator power amplifier (MOPA) system was used as a source of ultrashort pulses. This system consisted of a hybrid mode-locked Ho-doped fiber laser and Ho-doped fiber amplifier, pumped by Yb-doped fiber laser [42]. The experimental setup of the Holmium MOPA system is presented in Figure 1a.…”

Section: Ultrafast Ho-doped Fiber Laser System and Experimental Setupmentioning

confidence: 99%

Ex Vivo Exposure to Soft Biological Tissues by the 2-μm All-Fiber Ultrafast Holmium Laser System

et al. 2022

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We present the results of ex vivo exposure by an ultrafast all-fiber Holmium laser system to porcine longissimus muscle tissues. A simple Ho-doped laser system generated ultrashort pulsed radiation with less than 1 ps pulse width and a repetition rate of 20 MHz at a central wavelength of 2.06 μm. Single-spot ex vivo experiments were performed at an average power of 0.3 W and different exposure times of 5, 30 and 60 s, varying the total applied energy in the range of 1.5–18 J. Evaluation of laser radiation exposure was performed according to the depth and diameter of coagulation zones, ablation craters and thermal damage zones during the morphological study. Exposure by ultrashort pulsed radiation with an average power of 0.3 W showed destructive changes in the muscle tissue after 5 s and nucleation of an ablative crater. The maximum ablation efficiency was about 28% at the ablation depth and diameter of 180 μm and 500 μm, respectively. The continuous-wave radiation impact at the same parameters resulted only in heating of the near-muscular tissue, without ablation and coagulation traces. Exposure to tissue with an average power at 0.3 W of ultrashort pulsed radiation led, within 30 and 60 s, to similar results as caused by 0.5 W of continuous-wave radiation, although with less carbonization formation.

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“…15) The interest in the usage of SWCNTs in fiber systems has increased since their absorption is in the spectral range of 0.8-1.9 μm. [16][17][18][19] Hence, SWCNTs are popular due to their combination of properties such as a fast recovery, a low saturation intensity, and an easy integration into resonator. Nonetheless, one of the disadvantages of SWCNT embedding into the cavity is their prone to be damaged due to the pulsed energy of laser sources.…”

mentioning

confidence: 99%

Hybrid source of subnanosecond pulses in the spectral range 532–600 nm

Zhluktova

Kamynin

Arutyunyan

et al. 2021

Appl. Phys. Express

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The source of subnanosecond pulses in the spectral range of 532-600 nm due to the second harmonic generation in nonlinear lithium niobate and potassium dihydrogen phosphate crystals is presented. Pulses for second harmonic generation are obtained by amplifying the signal of the ytterbium-doped fiber laser with hybrid mode-locking. The hybrid mode provided self-triggering and reproducibility of the fiber system with stable temporal and spectral characteristics. The pulse repetition rate was 1 MHz with a duration of 210 ps and an energy of 0.7 nJ before amplification and 420 ps with an energy of 0.9 μJ after.

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Spectral and temporal dynamics of ultrashort pulses in a holmium-doped fibre amplifier

Cited by 11 publications

References 14 publications

Numerical model of hybrid mode-locked Tm-doped all-fibre laser

Numerical model of hybrid mode-locked Tm-doped all-fibre laser

Ex Vivo Exposure to Soft Biological Tissues by the 2-μm All-Fiber Ultrafast Holmium Laser System

Hybrid source of subnanosecond pulses in the spectral range 532–600 nm

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