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High power cladding-pumped low quantum defect Raman fiber amplifier

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Photonics Research 2024年第5期12卷 995-1003页

作者： YANG ZHANG JIANGMING Xu JUNRUI LIANG SICHENG LI JUN YE XIAOYA MA tianfu yao ZHIYONG PAN JINYONG LENG PU ZHOU College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China Hunan Provincial Key Laboratory of High Energy Laser Technology National University of Defense TechnologyChangsha 410073China

Heat generated by the quantum defect(QD)in optically pumped lasers can result in detrimental effects such as mode instability,frequency noise,and even catastrophic ***,we demonstrated that boson-peakbased Raman fiber lasers have great potential in low QD laser *** their power scalability and heat load characteristics have yet to be ***,we demonstrate a boson-peak-based Raman fiber amplifier(RFA)with 815 W output power and a QD of 1.3%.The low heat generation characteristics of this low QD RFA are *** experimental and simulation results show that at this power level,the heat load of the low QD RFA is significantly lower than that of the conventional RFA with a QD of 4.8%.Thanks to its low heat generation characteristics,the proposed phosphosilicate-fiber-based low QD RFA provides an effective solution for the intractable thermal issue in optically pumped lasers,which is of significance in reducing the laser’s noise,improving the laser’s stability and safety,and solving the challenge of heat removing.

关键词： pumped fiber amplifier

全光纤结构拉曼振荡器实现近1.8 kW激光输出

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红外与激光工程 2024年第5期53卷 268-270页

作者：范晨晨付敏郝修路黄善旻李阳陈子伦冷进勇姚天甫周朴国防科技大学前沿交叉学科学院湖南长沙410073 国防科技大学南湖之光实验室湖南长沙410073 国防科技大学高能激光技术湖南省重点实验室湖南长沙410073

拉曼光纤激光器在实现高功率特殊波长激光方面具有独特优势,受到了广泛关注和研究。近年来,随着渐变折射率多模光纤在拉曼激光器中的运用,不仅提高了可注入的泵浦功率,还通过光束净化特性实现了激光亮度增强。

关键词：光纤激光拉曼振荡器受激拉曼散射渐变折射率光纤

Power scaling on tellurite glass Raman fibre lasers for mid-infrared applications

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High Power Laser Science and Engineering 2018年第2期6卷 74-82页

作者： tianfu yao Liangjin Huang Pu Zhou Bing Lei Jinyong Leng Jinbao Chen College of Opto-Electronic Science and Engineering National University of Defense Technology Academy of Ocean Science and Engineering National University of Defense Technology

The power scaling on mid-infrared Raman fibre lasers(RFLs) is in demand for applications in health, environment and security. In this paper, we present the simulated laser behaviours of the tellurite glass RFLs pumped by 300-W Tm-doped fibre lasers(TDFLs) at 2 μm for the first time. By combining the advantages of the TDFLs and tellurite fibre, the output power at 2.35 μm has reached over hundreds of watts by first-order Raman shift. Moreover, the cascaded RFLs have been demonstrated with a wavelength extension greater than 3 μm and output power of tens of watts. To maximize the output power and the slope efficiency of the RFLs, we further analyse the interaction between the Raman gain and cavity loss, which are determined by fibre length and output reflectance of the laser cavity.

关键词： mid-infrared fibre lasers Raman fibre lasers stimulated Raman scattering tellurite glass fibre

基于声致光纤光栅输出1.1~1.5μm波段高功率随机涡旋光束

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光学学报 2024年第10期44卷 414-421页

作者：李阳姚天甫范晨晨郝修路马小雅许将明张青松曾祥龙周朴国防科技大学前沿交叉学科学院湖南长沙410073 国防科技大学南湖之光实验室湖南长沙410073 高能激光技术湖南省重点实验室湖南长沙410073 上海大学特种光纤与光接入网重点实验室特种光纤与先进通信国际合作联合实验室上海200444

近年来,携带轨道角动量(OAM)的涡旋光束因具有重要研究价值和应用前景而备受关注。随着涡旋光束在传感、测量以及大容量光通信中的应用,输出带宽以及波长可调谐性成为关注的热点。突破稀土掺杂光纤发射波长限制和宽带模式转换的器件是... 详细信息

近年来,携带轨道角动量(OAM)的涡旋光束因具有重要研究价值和应用前景而备受关注。随着涡旋光束在传感、测量以及大容量光通信中的应用,输出带宽以及波长可调谐性成为关注的热点。突破稀土掺杂光纤发射波长限制和宽带模式转换的器件是实现特殊波段/宽带涡旋光输出的基础。为同时满足以上要求,本文采用基于分布式瑞利散射的随机拉曼光纤激光器结构,结合具备宽带模式转换能力的声致光纤光栅(AIFG),通过级联拉曼频移,实现了1133.9、1197.6、1260.5、1331.8、1414.5、1513.7 nm波长处拓扑荷数l=±1的涡旋光束输出,并通过自干涉实验进行验证。在1513.7 nm波长处功率为23.6 W,效率为31.1%。该研究不仅在全光纤中实现了紧凑的波长可调谐高功率涡旋光输出,验证了AIFG的超宽模式转换能力,也为其他波段涡旋光输出提供了参考方案,可进一步拓展涡旋光在多维光通信、光场与物质相互作用等领域的应用。

关键词：随机拉曼光纤激光器涡旋光束声致光纤光栅轨道角动量

Functional Fibers and Functional Fiber‑Based Components for High‑Power Lasers

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Advanced Fiber Materials 2023年第1期5卷 59-106页

作者： Xiao Chen tianfu yao Liangjin Huang Yi An Hanshuo Wu Zhiyong Pan Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

The success of high-power fiber lasers is fueled by maturation of active and passive fibers,combined with the availability of high-power fiber-based *** this contribution,we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser ***,the emerging functional active and passive fibers in recent years,which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission,are outlined from the perspectives of geo-metric and material ***,novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection,and correspondingly,the high-power progress of function fiber-based components in power handling are introduced,which suggest more flexible controllability on high-power laser operations.

关键词： High-power laser Laser fiber Passive fiber-based component Functional fiber Functional fiber-based component

Greater than 2 kW all-passive fiber Raman amplifier with good beam quality

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High Power Laser Science and Engineering 2020年第4期8卷 23-28页

作者： Yizhu Chen tianfu yao Hu Xiao Jinyong Leng Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index *** maximum power output reaches up to 2.034 kW centered at 1130 nm,with a conversion efficiency of 79.35%with respect to the injected pump *** the best of our knowledge,this is the highest conversion efficiency obtained for any Raman laser system using graded-index *** optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated,enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier,and further enhancing the ultimate brightness of the output laser after *** the maximum power output,the beam quality parameter M2 is 2.8,corresponding to a signal-to-pump brightness enhancement factor of *** far as we know,we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W,and the best beam quality for graded-index Raman fiber lasers of over 150 W.

关键词： nonlinear optics optical fiber lasers power amplifiers Raman scattering

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

Revealing the dynamics of intensity fluctuation transfer in a random Raman fiber laser

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Photonics Research 2022年第3期10卷 618-627页

作者： Jun Ye Xiaoya Ma Yang Zhang Jiangming Xu Hanwei Zhang tianfu yao Jinyong Leng Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

Temporal intensity fluctuation is one of the inherent features of fiber *** utilizing the fiber lasers to pump a random Raman fiber laser(RRFL),the intensity fluctuation transfer from the pump to the random lasing could affect the output performance *** this paper,we comprehensively compared the spectral,temporal,and power characteristics of an RRFL pumped by two different fiber lasers—a temporally unstable fiber oscillator and a temporally stable amplified spontaneous emission(ASE)*** to less impact of the intensity fluctuation transfer,the ASE source-pumped RRFL shows∼45.3%higher maximum output power,higher spectral purity(>99.9%)and optical signal-to-noise ratio(>40dB),weaker spectral broadening,and more stable temporal behavior compared to the fiber oscillator-pumped ***,based on the temporal-spatial-coupled Raman equations and the generalized nonlinear Schrödinger equations,we numerically revealed the impact of the pump intensity fluctuations on the output characteristics of RRFLs,and found that the temporal walk-off effect played an important role in the dynamics of intensity fluctuation *** work may provide a reference for designing and implementing high-performance RRFLs and promote their practicability in sensing,telecommunications,and high-power applications.

关键词： fiber pumped pump

Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality

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High Power Laser Science and Engineering 2022年第4期10卷 1-6页

作者： Guangjian Wang Jiaxin Song Yisha Chen Shuai Ren Pengfei Ma Wei Liu tianfu yao Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China

In this work,an all-fiberized and narrow-linewidth fiber amplifier with record output power and near-diffraction-limited beam quality is *** to 6.12 kW fiber laser with the conversion efficiency of approximately 78.8%is achieved through the fiber amplifier based on a conventional step-index active *** the maximum output power,the 3 dB spectral linewidth is approximately 0.86 nm and the beam quality factor is M_(x)^(2)=1.43,M_(y)^(2)=*** have also measured and compared the output properties of the fiber amplifier employing different pumping ***,the practical power limit of the fiber amplifier could be estimated through the maximum output powers of the fiber amplifier employing unidirectional pumping ***,this work could provide a good reference for the optimal design and potential exploration of high-power narrow-linewidth fiber laser systems.

关键词： fiber laser high power narrow linewidth