High-power fiber lasers based on tandem pumping

Zhang, Pu; Hu, Xiao; Leng, Jinyong; Xu, Jiangmin; Chen, Zilun; Zhang, Hanwei; Liu, Zejin

doi:10.1364/josab.34.000a29

Cited by 109 publications

(37 citation statements)

References 73 publications

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“…In addition, the phonon spectrum of the glass matrix is noticeably rebuilt by the impurities, and its structurization, according to our data, consists in the formation of a powerful oscillatory mode 3 → 381 cm −1 with a damping constant equal to 215 cm −1 . As a result, the Raman gain coefficient is much higher compared with pure SiO 2 in the actual Stokes shift area from 100 cm −1 to 600 cm −1 (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18).…”

Section: Multimode Decomposition Of Raman Gain Profilesmentioning

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%

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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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Section: Multimode Decomposition Of Raman Gain Profilesmentioning

confidence: 99%

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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“…A Tm-doped fiber laser could also be tandempumped by another Tm: fiber laser at > 1900 nm, since the absorption band of a Tm-doped silica fiber related to the 3 H 6 → 3 H 4 transition extends up to > 1900 nm [12], thus allowing for higher Stocks efficiency and further reduction of quantum-defect-induced heat generation [22][23][24][25]. Indeed, tandem-pumping scheme was widely employed in kW-level Yb-doped fiber lasers to minimize the quantum-defect-induced heat generation, thus enabling high-power operation of fiber lasers [26,27]. Recently, Creeden et al used a 1908-nm source to in-bandpump a Tm-doped fiber laser operating at 2005 nm, demonstrating >90% slope efficiency and a potential of power-scaling to 2 kW [22,23].…”

Section: Introductionmentioning

confidence: 99%

Tandem-pumped, tunable thulium-doped fiber laser in 21 μm wavelength region

Liu¹,

Liu²,

Feng³

et al. 2019

Opt. Express

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We present a continuously tunable thulium(Tm)-doped fiber laser operating in the important 2.1 μm region, which is tandem-pumped by another Tm-doped fiber laser at 1908 nm. The advantages of pumping a Tm-doped fiber laser at the long-wavelength absorption tail (>1900 nm) of the fiber include a reduced quantum-defect, and efficient suppression of the amplified spontaneous noise (and potential parasitic lasing) at the short-wavelength region. This facilitates attainment of stable lasing operation in the long-wave emission tail of the Tm fiber at ~2.1 μm. By rotating a diffraction grating inside the Tm fiber laser cavity, we experimentally achieved a wavelength-tuning range of 2000-2172 nm. At central wavelengths of 2050 nm, 2150 nm, and 2172 nm, the slope efficiencies were 23%, 16%, and 9.9%, respectively. To the best of our knowledge, this is the first demonstration of long-wavelength operation of a Tm fiber laser system tandem-pumped at >1900 nm.

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“…Despite most of the high power, narrow-bandwidth fiber amplifiers being pumped by 976 nm laser diodes (LDs) for being favorable of SBS management, tandem pumping is a robust route for simultaneously decreasing the quantum defect and pump absorption for TMI suppression [33,37] . This technique had been widely used in high power fiber amplifiers with broadband spectral characteristics [38][39][40][41][42] , and the output powers had been remarkably scaled to be beyond 3.5 kW power level by several groups [38,41,42] . Due to the small absorption area of the Yb-doped active fiber at 1018 nm, one point should be noted that the suppressions of SBS and stimulated Raman scattering (SRS) are more difficult when tandem pumping is employed in high power, narrow-bandwidth fiber amplifiers.…”

Section: Introductionmentioning

confidence: 99%

High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

Meng

et al. 2018

High Pow Laser Sci Eng

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An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with record output power of 4 kW level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced into the narrow-bandwidth MOPA system for thermally induced mode instability (TMI) suppression. The stimulated Brillouin scattering (SBS) effect is balanced by simply using one-stage phase modulation technique. With different phase modulation signals, SBS limited output powers of 336 W, 1.2 kW and 3.94 kW are respectively achieved with spectral bandwidths accounting for 90% power of ${\sim}$0.025, 0.17 and ${\sim}$0.89 nm. Compared with our previous 976 nm pumping system, TMI threshold is overall boosted to be ${>}$5 times in which tandem pumping increases the TMI threshold of ${>}$3 times. The beam quality ($M^{2}$ factor) of the output laser is well within 1.5 below the TMI threshold while it is ultimately saturated to be 1.86 with the influence of TMI at maximal output power. Except for SBS and TMI, stimulated Raman scattering (SRS) effect will be another challenge for further power scaling. In such a high power MOPA system, multi-detrimental effects (SBS, SRS and TMI) will coexist and may be mutual-coupled, which could provide a well platform for further comprehensively investigating and optimizing the high power, narrow-bandwidth fiber amplifiers.

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High-power fiber lasers based on tandem pumping

Cited by 109 publications

References 73 publications

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

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

Tandem-pumped, tunable thulium-doped fiber laser in 21 μm wavelength region

High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

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