Investigation of stimulated Raman scattering effect in high-power fiber amplifiers seeded by narrow-band filtered superfluorescent source

Liu, Wei; Ma, Pengfei; Lv, Hualiang; Xu, Jiangming; Zhang, Pu; Jiang, Zongfu

doi:10.1364/oe.24.008708

Cited by 47 publications

(27 citation statements)

References 25 publications

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“…Nowadays, filtered super-fluorescent source [2], multi-longitudinal-mode fiber oscillator [7][8][9], random fiber laser [10], fiber-Bragggrating-stabilized laser diode [11] and the phase modulated single frequency laser [4,5,[12][13][14][15] have been used as the narrow-linewidth injected seed in high power MOPA configurations. Among these different types, phase modulated single frequency laser has been proved to be preferable for the reason of stable temporal property, high SRS threshold and spectral purity during the amplification process [31][32][33]. Besides, stable temporal property and low intensity noise are also compatible with the TMI suppressing requirement of injected seed laser [19].…”

Section: Experimental Design Strateriesmentioning

confidence: 99%

All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

Liu

et al. 2021

High Pow Laser Sci Eng

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In this paper, an all-fiberized and narrow-linewidth 5 kW power-level fiber amplifier is presented. The laser is achieved based on the master oscillator power amplification (MOPA) configuration, in which the phase-modulated single-frequency laser is applied as the seed laser and bidirectional pumping configuration is applied in the power amplifier. The stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and transverse mode instability (TMI) effects are all effectively suppressed in the experiment. Consequently, the output power is scaled up to 4.92 kW with a slope efficiency of as high as ~ 80%. The 3 dB spectral width is about 0.59 nm, and the beam quality is measured to be M 2 ~ 1.22 at maximum output power. Furthermore, we have also conducted detail spectral analysis on the spectral width of the signal laser, which reveals that the spectral wing broadening phenomenon could lead to the obvious decrease of the spectral purity at certain output power. Overall, this work could provide a well reference for obtaining and optimizing high-power narrow-linewidth fiber lasers.

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Section: Experimental Design Strateriesmentioning

confidence: 99%

All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

Liu

et al. 2021

High Pow Laser Sci Eng

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“…[29] pumped by the LD. As the linewidth broadening is mainly induced by the generation of nonlinear effects [41] , such as self-phase modulation (SPM) and cross-phase modulation (XPM), the difference may be induced by the relative long gain fiber employed in this scheme. The spectral evolution in the power scaling process will be investigated in detail in the following paragraph.…”

Section: Resultsmentioning

confidence: 99%

“…The linear fitting result shown in Figure 4(c) indicates that the FWHM linewidth broadening factor of narrowband seed amplification increases with a rate of about 0.5952 nm per kilowatt, which is about 10 times as large as that of broadband seed amplification. This may be induced by the differences of the spectrum density and intensity noise of the seeds [41, 45, 46] . As the linewidth broadening in the narrowband seed amplification is relatively more serious than that in the broadband seed amplification, the optimization of the FWHM linewidth of the employed seed is very important for the design of the powerful SFS system if special output linewidth is required.…”

Section: Resultsmentioning

confidence: 99%

In-band pumping avenue based high power superfluorescent fiber source with record power and near-diffraction-limited beam quality

et al. 2018

High Pow Laser Sci Eng

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High power superfluorescent fiber sources (SFSs), which could find wide applications in many fields such as middle infrared laser generation, Raman fiber laser pumping and spectral beam combination, have experienced a flourishing time in recent years for its unique properties, such as short coherence length and high temporal stability. The challenge for performance scalability of powerful SFS mainly lies on the physical issues including parasitic laser oscillation and modal instability (MI). In this contribution, by employing in-band pumping avenue and high-order transverse-mode management, we explore a high power SFS with record power, near-diffraction-limited beam quality and spectral manipulation flexibility. An ultimate output power of 3.14 kW can be obtained with high temporal stability and a beam quality of M 2 = 1.59 for the amplified light. Furthermore, the dynamics of spectral evolutions, including redshifting of central wavelength and unsymmetrical broadening in spectral wings, of the main amplifier with different seed linewidths are investigated contrastively. Benefiting from the unique high pump brightness and high MI threshold of in-band pumping scheme, the demonstrated system also manifests promising performance scaling potential.

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“…For core-pumped RFA, the typical pump sources are rare-earth doped fiber lasers, which induces strong temporal fluctuations in picosecond scale [19]. The spectral and temporal characteristics of this source can be calculated through combined simulation of the rate equations and nonlinear Shrödinger equations [20][21][22]. Here, we apply a simpler way to character the temporal fluctuations through the polarized thermal radiation model [23]:…”

Section: Spectral Broadening In a Single-frequency Rfamentioning

confidence: 99%

Intrinsic Mechanism for Spectral Evolution in Single-Frequency Raman Fiber Amplifier

Liu

Miao

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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Abstract:In this work, the spectral evolution properties in single-frequency Raman fiber amplifier (RFA) with different pump manners are analyzed theoretically for the first time based on the gain dynamics. The analysis of gain dynamics reveals that the walk-off effect in counter-pumped manner produces a natural low-pass filter in single-frequency RFA. When applying rare-earth doped fiber lasers as the pump source, the strong temporal fluctuations in the pump source lead to spectral broadening in co-pumped manner, while the natural low-pass filter in countered-pumped case can still ensure single-frequency operation. Furthermore, applying temporal stable laser, such as single-frequency fiber laser or narrow band fiber laser spectral broadened by phase modulation technique, as the pump source would be superior for high-performance single-frequency RFA for the both two pump manners.

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Investigation of stimulated Raman scattering effect in high-power fiber amplifiers seeded by narrow-band filtered superfluorescent source

Cited by 47 publications

References 25 publications

All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration

In-band pumping avenue based high power superfluorescent fiber source with record power and near-diffraction-limited beam quality

Intrinsic Mechanism for Spectral Evolution in Single-Frequency Raman Fiber Amplifier

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