Modal Dynamics in Kilowatt Cladding-Pumped Random Distributed Feedback Raman Fiber Laser With Brightness Enhancement

Fan, Chenchen; An, Yi; Li, Yang; Hao, Xiulu; Yao, Tianfu; Hu, Xiao; Huang, Liangjin; Xu, Jiangming; Leng, Jinyong; Zhang, Pu

doi:10.1109/jlt.2022.3194534

Cited by 5 publications

(5 citation statements)

References 41 publications

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“…In our work, the RRFL does not have seed light or a lowreflective grating with mode-selecting effects. Therefore, compared to previous work [13], this work is not only structurally innovative but also further verifies the brightness improvement and power scaling capabilities based on GRIN fibers. Moreover, the utilization of graded-index (GRIN) fiber in random fiber lasers directly pumped by multimode LDs plays a vital role in enhancing the brightness.…”

Section: B the Spatial Domain Characteristics Of Sw (1018nm) Rrflmentioning

confidence: 59%

“…At present, most of the SWs output schemes are based on solid-state lasers such as laser diodes (LDs) [13]. One of the interesting possibilities is to directly pump purely passive fibers using available high-power multimode laser diodes (LDs) at 915-950 nm.…”

Section: Introductionmentioning

confidence: 99%

“…However, the two-stage conversion for signal light through pumping results in a low electrooptical efficiency (less than 20%) of the laser system [13]. With the development of highbrightness LDs and high-nonlinear fiber technology, obtaining laser output based on direct pumping of passive fibers by LDs will be a new technological solution for achieving SWs laser in the future [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Brightness enhancement on random-distributed-feedback Raman fiber lasers pumped by multimode diodes

Hao,

Fan,

et al. 2024

High Pow Laser Sci Eng

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The power scaling on short wavelengths (SWs) fiber lasers operating around 1 µm are in significant demand for applications in energy, environment, and industry. The challenge for performance scalability of high-power SW lasers based on rare-earth (RE) doped fiber primarily lies on the physical limitations, including reabsorption, amplified spontaneous emission (ASE), and parasitic laser oscillation. Here, we demonstrate an all-fiberized, purely passive SW (1018nm) random-distributed-feedback Raman fiber laser (RRFLs) to validate the capability of achieving high-power output at SWs based on direct pumping by multimode LDs. Directly pumped by multimode LDs, the high-brightness RRFLs delivered over 656 W, with an electro-optical efficiency of 20% relative to the power. The slope efficiency is 94%. The beam quality M 2 factor is 2.9 (which is ~20 of pump) at the maximum output signal power, achieving the highest brightness enhancement (BE) of 14.9 in RRFLs. To the best of our knowledge, this achievement also represents the highest power record of RRFLs utilizing multimode diodes for directly pumping. This work may not only provide a new insight into the realization of high-power, highbrightness RRFLs but also is a promising contender in the power scaling on SWs below 1 µm.

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Section: B the Spatial Domain Characteristics Of Sw (1018nm) Rrflmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Brightness enhancement on random-distributed-feedback Raman fiber lasers pumped by multimode diodes

Hao,

Fan,

et al. 2024

High Pow Laser Sci Eng

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“…[69] To improve the lasing performances, the characteristics of RRFLs are investigated in-depth in terms of threshold decreasing, [36,110] polarization state control, [111][112][113] pulse generation, [26,[114][115][116] and power scaling. [20,117,118] Besides standard SMF, various kinds of optical fibers are capable of being utilized in RRFLs for different purposes. Taking the replacement of SMF, few-mode fiber (FMF) [119] and multimode fiber (MMF) [120][121][122] were utilized in RRFLs to realize high-order mode random lasing generation.…”

Section: Rrfls With Lasing Wavelength At 1-21 µM Bandmentioning

confidence: 99%

“…[6,7] At first, RFL was achieved by employing the combination of the Rayleigh backscattering induced by refractive index inhomogeneities and distributed amplification through the Raman effect, [7] which has then attracted extensive investigations into aspects of underlying physical mechanisms, output characteristics optimization, applications in various fields, etc. [8][9][10][11][12][13][14] With the unique feedback mechanism and 1D geometry, RFLs possess the advantages of both conventional fiber lasers and random lasers, such as low noise, [15][16][17] high efficiency, [18][19][20] narrow linewidth, [21][22][23] modeless, [15,24,25] etc. Particularly, significant advancements in the spectral properties of RFLs have emerged in the aspects of numerical modeling and physical mechanism investigation, lasing wavelength extension, spectrum manipulation, and the applications of spectral-tailored RFLs, etc.…”

Section: Introductionmentioning

confidence: 99%

Spectral Manipulations of Random Fiber Lasers: Principles, Characteristics, and Applications

Han,

Cheng,

Tao

et al. 2024

Laser & Photonics Reviews

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Random fiber lasers (RFLs), a new variety of random lasers, have become a vigorous research spot over the past decades. RFLs possess superiorities in efficiency, structural flexibility, directionality, cost, etc. Particularly, RFLs are discovered to be good platforms for the construction of various forms of high‐performance lasers. Herein, recent progress in the spectral manipulation of RFLs and the applications of spectral‐tailored RFLs are reviewed. Both theoretical and experimental investigations of the unique spectral properties of RFLs up to now are presented. The superior wavelength flexibility of RFLs which can achieve any desired lasing wavelength in the 1–2.1 µm band is highlighted. Via spectral manipulation, RFLs have shown the capability of high‐spectral‐purity, narrow‐bandwidth, and multi‐wavelength output. Furthermore, the RFLs featuring unique spectral properties can lead to various promising applications, which are concisely summarized, including optical fiber communication, optical fiber sensing, imaging, supercontinuum generation, nonlinear‐frequency conversion, mid‐infrared lasing pump sources, and laser‐driven inertial confinement fusion motivation. The challenges and prospects for RFLs are also discussed.

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The Applications of Random Fiber Lasers in Optical Fiber Communication and Sensing Systems: A Review

Han,

Ma,

Zhao

et al. 2024

IEEE Trans. Instrum. Meas.

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Modal Dynamics in Kilowatt Cladding-Pumped Random Distributed Feedback Raman Fiber Laser With Brightness Enhancement

Cited by 5 publications

References 41 publications

Brightness enhancement on random-distributed-feedback Raman fiber lasers pumped by multimode diodes

Brightness enhancement on random-distributed-feedback Raman fiber lasers pumped by multimode diodes

Spectral Manipulations of Random Fiber Lasers: Principles, Characteristics, and Applications

The Applications of Random Fiber Lasers in Optical Fiber Communication and Sensing Systems: A Review

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