Bidirectional pumped high power Raman fiber laser

Xiao, Qirong; Yan, Ping; Li, Deyu; Sun, Jie; Wang, X.; Huang, Yusheng; Gong, Mali

doi:10.1364/oe.24.006758

Cited by 98 publications

(38 citation statements)

References 15 publications

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“…For example, if Seed 1 is 1070 nm laser, the wavelength of Seed 2 can be 1120 nm in silica fiber. It is to be noted that Seed 2 can also be provided by the spontaneous noise generated inside Seed 1 [37] . Since the gain obtained from Yb-ion and Raman scattering is based on different mechanisms, the phase-coupling between Yb gain and Raman gain can be neglected.…”

Section: Modeling Of Nonlinear Fiber Amplifiermentioning

confidence: 99%

“…Recently, several independent groups have proposed a novel system setup [33][34][35][36][37][38][39][40] named Yb-Raman fiber amplifier or nonlinear fiber amplifier (NFA, we call it nonlinear fiber amplifier in this paper), where laser gain provided by both SRS and active fiber is employed. In this new setup, the signal laser is firstly amplified via doped ions in the fiber and then the laser power is transferred into Stokes wave via SRS effect.…”

Section: Introductionmentioning

confidence: 99%

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Toward high-power nonlinear fiber amplifier

Zhang

et al. 2018

High Pow Laser Sci Eng

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Stimulated Raman scattering (SRS) effect is considered to be one of the main obstacles for power scaling in general-type fiber lasers. Different from previous techniques that aim at suppressing SRS, nonlinear fiber amplifier (NFA), which manipulates and employs the SRS for power scaling in rare-earth-doped fiber, is under intensive research in recent years. In this paper, the authors will present an all-round study on this new kind of high-power fiber amplifier. A theoretical model is proposed based on the rate equation and amplified spontaneous emission (ASE), with random noise taken into account. By numerical solving of the theoretical model, the power scaling potential, heat analysis and advantages in suppressing the undesired backscattering light are quantificationally analyzed for the first time. Then two different types of high-power NFAs are demonstrated individually. Firstly, a laser diode pumped NFA has reached kilowatt output power, and the results agree well with theoretical predictions. Secondly, a tandem-pumped NFA is proposed for the first time and validated experimentally, in which 1.5 kW output power has been achieved. The authors also briefly discuss several new issues relating to the complex nonlinear dynamics that occur in high-power NFAs, which might be interesting topics for future endeavors.

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Section: Modeling Of Nonlinear Fiber Amplifiermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Toward high-power nonlinear fiber amplifier

Zhang

et al. 2018

High Pow Laser Sci Eng

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“…where Γ is the damping constant, and Ω 0 is the selfresonant frequency of a harmonic oscillator without attenuation, is the effective mass of the oscillation. Note that the homogeneous equation in (6), as is known [17], must have quasiperiodic solutions only in the case of weakly damped oscillations Γ < Ω 0 , and its resonance frequency is equal to Ω = √︀ Ω 2 0 − Γ 2 , i.e. it decreases under the attenuation influence.…”

Section: Classical Electrodynamics Of Light Scattering Processes In Smentioning

confidence: 99%

“…They are primarily associated with the use of various doping impurities to silica glass, from which the most common fibers are made. Over the last decade, the impressive achievements in increasing the output power have been registered both for laser sources on rare earth ions [2][3][4] and for non-inverse lasers based on the effect of stimulated Raman scattering (SRS) of light [5,6]. For example, a fiber Raman laser (FRL) at an arbitrary wavelength can be built, by using a short (∼30 m) sample of standard single-mode fiber made of silica glass [7].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Features of Raman Gain Profiles in Single-Mode Fibers Based on Silica Glass

Serdeha¹,

Grygoruk²,

Felinskyi³

2018

Ukr. J. Phys.

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The spectroscopic analysis of the frequency distribution of the amplification of optical radiation due to the Raman effect (Raman gain profile) in single-mode fibers based on silica glass has been carried out in the region of Stokes frequency shifts from 0 to 1400 cm −1 . The Raman gain profiles are determined from the experimental spectra of spontaneous scattering for widespread fibers, namely for pure SiO2, GeO2, P2O5, and TiO2 doped fibers. The analytic expressions of the Raman gain profiles are given. They are obtained, by using the Gaussian decomposition by means of 11-12 modes, and the experimental profile is approximated with an accuracy of not less than 0.3%. The decomposition results are analyzed in terms of the fundamental oscillatory dynamics of molecular nanocomplexes in amorphous glass, as well as in the application aspect of the modeling of photonics devices. Examples of the proposed method applications are presented for the analysis of noise parameters of the fiber Raman amplifiers and for the generation bandwidth in fiber Raman lasers. K e y w o r d s: optical amplification, Raman gain, fiber Raman lasers, fiber Raman amplifiers.

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“…However in these laser systems the stokes shifting is achieved in fiber core, as a consequence it can hardly enhance the laser brightness through amplification. Then higher power output is acquired through fiber lasers employing integrated Yb-Raman gain [12][13][14], nevertheless the brightness decreases in the Raman shifting process and the issues of PD reappear which will influence the performance of laser system. Recently the fast development of fiber components and the brightness enhancement of pump lasers make it possible for power scaling in passive fibers that employ pure Raman gain [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Pure Passive Fiber Enabled Highly Efficient Raman Fiber Amplifier With Record Kilowatt Power

Chen

Leng

et al. 2019

IEEE Access

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Kilowatt-level high efficiency all-fiberized Raman fiber amplifier based on pure passive fiber is proposed for the first time in this paper. The laser system is established on master oscillator power amplification configuration while a piece of graded-index passive fiber is utilized as stokes shifting as well as gain medium, which is entirely irrelevant to rare-earth-doped gain mechanism. When the pump power is 1368.8 W, we obtained 1002.3 W continuous-wave laser power at 1060 nm with the corresponding opticalto-optical efficiency of 84%. The beam parameter M 2 improves from 9.17 of the pump laser to 5.11 of the signal laser through the amplification process, and the brightness enhancement is about 2.57 at maximum output power as a consequence of the beam clean-up process in the graded-index fiber. To the best of our knowledge, we have demonstrated the first kilowatt-level high efficiency Raman fiber amplifier based on pure passive fiber with brightness enhancement.INDEX TERMS Fiber lasers, fiber nonlinear optics, high power amplifiers, Raman scattering.

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Bidirectional pumped high power Raman fiber laser

Cited by 98 publications

References 15 publications

Toward high-power nonlinear fiber amplifier

Toward high-power nonlinear fiber amplifier

Spectroscopic Features of Raman Gain Profiles in Single-Mode Fibers Based on Silica Glass

Pure Passive Fiber Enabled Highly Efficient Raman Fiber Amplifier With Record Kilowatt Power

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