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Investigation on extreme frequency shift in silica fiber-based high-power Raman fiber laser

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High Power Laser Science and Engineering 2018年第2期6卷 103-109页

作者： Jiaxin Song Hanshuo Wu Jun Ye Hanwei Zhang jiangming xu Pu Zhou Zejin Liu College of Optoelectronic Science and Engineering National University of Defense Technology

In this paper, we experimentally investigated the extreme frequency shift in high-power Raman fiber laser(RFL). The RFL was developed by using a pair of fiber Bragg gratings with fixed and matched central wavelength(1120 nm)combined with a piece of 31-m-long polarization maintaining(PM) passive fiber adopted as Raman gain *** pump source was a homemade high-power, linearly polarized(LP) wavelength-tunable master oscillator power amplifier(MOPA) source with ～25 nm tunable working range(1055–1080 nm). High-power and high-efficiency RFL with extreme frequency shift between the pump and Stokes light was explored. It is found that frequency shift located within 10.6 THz and 15.2 THz can ensure efficient Raman lasing, where the conversion efficiency is more than 95% of the maximal value, 71.3%. In addition, a maximum output power of 147.1 W was obtained with an optical efficiency of71.3%, which is the highest power ever reported in LP RFLs to the best of our knowledge.

关键词： linearly polarized laser Raman fiber laser Raman gain spectrum

Tandem pumping architecture enabled high power random fiberlaser with near-diffraction-limited beam quality

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Science China(Technological Sciences) 2019年第1期62卷 80-86页

作者： xu jiangming YE Jun ZHOU Pu LENG JinYong XIAO Hu ZHANG HangWei WU Jian CHEN JinBao College of Optoelectronic Science and Engineering National University of Defense Technology

In this contribution, we present the tandem pumping avenue leveraged performance scaling of random fiber laser to record 3 kW level with inherent temporal stability and near-diffraction-limited beam quality. The high power system employs a four-stage master oscillator power amplifier chain. The master oscillator is a half-opened cavity structured random distributed feedback fiber laser centered at 1080 nm and pumped by incoherent amplified spontaneous emission source. Narrowband random laser seed is selected by employing a spectral filtering module with a maximum output power of 1.08 W, full width at half maximum linewidth of 0.47 nm and spectral optical-signal-to-noise ratio of about 42 dB. As to the main amplification stage, for given 104 W pre-amplified random laser seed and 3.61 kW pump laser, an ultimate output power of 3.03 kW can be obtained,corresponding to an optical-to-optical conversion efficiency of 81.05%. Nearly single-transverse-mode amplified random laser can be achieved even at full power level for inherent high thermal modal instability threshold enabled by tandem pumping and inducing bending loss for high-order transverse-mode. Further performance scaling of this high power random laser system, such as power boosting, operation wavelength tuning and linewidth alteration, is the next goal.

关键词： random fiber laser distributed feedback power scalability tandem pumping

Powerful Narrow Linewidth Random Fiber Laser

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Photonic Sensors 2017年第1期7卷 82-87页

作者： Jun YE jiangming xu Hanwei ZHANG Pu ZHOU College of Optoelectronic Science and Engineering National University of Defense Technology Changsha 410073China Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser Changsha 410073 China

In this paper, we demonstrate a narrow linewidth random fiber laser, which employs a tunable pump laser to select the operating wavelength for efficiency optimization, a narrow-band fiber Bragg grating （FBG） and a section of single mode fiber to construct a half-open cavity, and a circulator to separate pump light input and random lasing output. Spectral linewidth down to 42.31 GHz is achieved through filtering by the FBG. When 8.97 W pump light centered at the optimized wavelength 1036.5nm is launched into the half-open cavity, 1081.4 nm random lasing with the maximum output power of 2.15 W is achieved, which is more powerful than the previous reported results.

关键词： Random fiber laser distributed feedback Rayleigh scattering Raman scattering

Efficient,62.5 Watts all-fiber single-mode 1091 nm MOPA laser

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Frontiers of Optoelectronics 2011年第4期4卷 426-429页

作者： jiangming xu Xiaolin DONG Jinyong LENG Pu ZHOU Jing HOU College of Optoelectronic Science and Engineering National University of Defense Technology

A high power all-fiber single-mode 1091 nm laser is constructed in master oscillator power amplifier(MOPA) configuration. The home-made seed source is an Yb3+-doped fiber ring laser with 22.5 mW maximal output power. A two-stage pre-amplification configuration is employed to boost seed power to 3 W. The ultimate output power of the main amplification stage is 62.5 W,corresponding to an optical-to-optical conversion efficiency of 78.1%. No residual pump light or amplified spontaneous emission(ASE) is observed under maximal output power. Because of the using of fiber Brag grating(FBG) to select frequency in seed laser, the full width at half maximum(FWHM) linewidth of output light is narrower than 0.1 nm.

关键词： all-fiber high efficiency single-mode master oscillator power amplifier (MOPA) fiber amplifier 1091 nm

High-power linearly-polarized tunable Raman fiber laser

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Chinese Physics B 2018年第9期27卷 316-321页

作者： Jiaxin Song Hanshuo Wu jiangming xu Hanwei Zhang Jun Ye Jian Wu and Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

In this study, we demonstrate an all-fiber high-power linearly-polarized tunable Raman fiber laser system. An in- house high-power tunable fiber laser was employed as the pump source. A fiber loop mirror （FLM） serving as a high reflectivity mirror and a flat-cut endface serving as an output coupler were adopted to provide broadband feedback. A piece of 59-m commercial passive fiber was used as the Raman gain medium. The Raman laser had a 27.6 nm tuning range from 1112 nm to 1139.6 nm and a maximum output power of 125.3 W, which corresponds to a conversion efficiency of 79.4%. The polarization extinction ratio （PER） at all operational wavelengths was measured to be over 21 dB. To the best of our knowledge, this is the first report on a hundred-watt level linearly-polarized tunable Raman fiber laser.

关键词： Raman laser linearly polarized tunable fiber laser

Near-diffraction-limited linearly polarized narrow-linewidth random fiber laser with record kilowatt output

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Photonics Research 2017年第4期5卷 350-354页

作者： jiangming xu LONG HUANG MAN JIANG JUN YE PENGFEI MA JINYONG LENG JIAN WU HANWEI ZHANG PU ZHOU College of Optoelectronic Science and Engineering National University of Defense Technology Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser

In this paper, we propose and experimentally investigate a linearly polarized narrow-linewidth random fiber laser(RFL) operating at 1080 nm and boost the output power to kilowatt level with near-diffraction-limited beam quality using a master oscillation power amplifier. The RFL based on a half-opened cavity, which is composed of a linearly polarized narrow-linewidth fiber Bragg grating and a 500 m piece of polarization-maintained Ge-doped fiber, generates a 0.71 W seed laser with an 88 pm full width at half-maximum(FWHM) linewidth and a 22.5 dB polarization extinction ratio(PER) for power scaling. A two-stage fiber amplifier enhances the seed laser to the maximal 1.01 k W with a PER value of 17 dB and a beam quality of M_x^2=1.15 and M_y^2=1.13. No stimulated Brillouin scattering effect is observed at the ultimate power level, and the FWHM linewidth of the amplified random laser broadens linearly as a function of the output power with a coefficient of about 0.1237 pm∕*** the best of our knowledge, this is the first demonstration of a linearly polarized narrow-linewidth RFL with even kilowatt-level near-diffraction-limited output, and further performance scaling is ongoing.

关键词： line RFL Near-diffraction-limited linearly polarized narrow-linewidth random fiber laser with record kilowatt output

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

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High Power Laser Science and Engineering 2018年第3期6卷 73-78页

作者： jiangming xu Jun Ye Hu Xiao Jinyong Leng Wei Liu Pu Zhou College of Optoelectronic Science and Engineering National University of Defense Technology Changsha 410073 China Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser Changsha 410073 China

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.

关键词： fiber amplifier high power in-band pumping superfluorescent fiber source

2-kW-level superfluorescent fiber source with flexible wavelength and linewidth tunable characteristics

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High Power Laser Science and Engineering 2021年第4期9卷 93-102页

作者： Jun Ye Chenchen Fan jiangming xu Hu Xiao Jinyong Leng Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

The superfluorescent fiber source(SFS)with tunable optical spectrum has shown great application potential in the sensing,imaging,and spectral ***,we demonstrate for the first time a 2-kW-level wavelength and linewidth tunable *** on a flexible filtered SFS seed and three stages of fiber amplifiers,the output power can be scaled from the milliwatt level to about 2 kW,with a wavelength tuning range of 1068–1092 nm and a linewidth tuning range of 2.5–9.7 ***,a numerical simulation is conducted based on the generalized nonlinear Schr?dinger equation,and the results reveal that the wavelength tuning range is limited by the decrease of seed power and the growth of amplified spontaneous emission,whereas the linewidth tuning range is determined by the gain competition and nonlinear Kerr *** developed wavelength and linewidth tunable SFS may be applied to scientific research and industrial processing.

关键词： fiber amplifiers high power superfluorescent fiber source tunable lasers

Ultralow-quantum-defect Raman laser based on the boson peak in phosphosilicate fiber

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Photonics Research 2020年第7期8卷 1155-1160页

作者： Yang Zhang jiangming xu Jun Ye Jiaxin Song Tianfu Yao Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

Quantum defects(QDs)have always been a key factor of the thermal effect in high-power fiber *** research on low-QD fiber lasers has been reported in the past decades,but most of it is based on active ***,Raman fiber lasers based on the stimulated Raman scattering effect in passive fiber are also becoming an important kind of high-power fiber laser for their unique advantages,such as their significantly broader wavelength-tuning range and being free of photon *** this paper,we demonstrate an ultralow-QD Raman fiber laser based on phosphosilicate *** is a strong boson peak located at a frequency shift of 3.65 THz in the Raman gain spectrum of the phosphosilicate fiber we *** utilizing this boson peak to provide Raman gain and adopting an amplified spontaneous emission source at 1066 nm as the pump source,1080 nm Stokes light is generated,corresponding to a QD of 1.3%.The spectral purity at 1080 nm can be up to 96.03%,and the output power is 12.5 W,corresponding to a conversion efficiency of 67.2%.Moreover,by increasing the pump wavelength to 1072 nm,the QD is reduced to 0.74%,and the output power at 1080 nm is 10.7 W,with a spectral purity of 82.82%.To the best of our knowledge,this is the lowest QD ever reported for Raman fiber *** work proposes a promising way of achieving high-power,high-efficiency Raman fiber lasers.

关键词： fiber pump laser