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Mode division multiplexing reconstructive spectrometer with an all-fiber photonics lantern

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Frontiers of Optoelectronics 2024年第3期17卷 29-38页

作者： Junrui Liang Jun Ye Xiaoya Ma Yao Lu Jun Li jiangming xu Zilun Chen Jinyong Leng Zongfu Jiang Pu Zhou College of Advanced Disciplinary 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 Space Engineering University Beijing 101416China

This study presents a high-accuracy,all-fber mode division multiplexing(MDM)reconstructive spectrometer(RS).The MDM was achieved by utilizing a custom-designed 3×1 mode-selective photonics lantern to launch distinct spatial modes into the multimode fber(MMF).This facilitated the information transmission by increasing light scattering processes,thereby encoding the optical spectra more comprehensively into speckle *** resolution of 2 pm and the recovery of 2000 spectral channels were *** to methods employing single-mode excitation and two-mode excitation,the three-mode excitation method reduced the recovered error by 88%and 50%respectively.A resolution enhancement approach based on alternating mode modulation was proposed,reaching the MMF limit for the 3 dB bandwidth of the spectral correlation *** proof-of-concept study can be further extended to encompass diverse programmable mode *** is not only succinct and highly efcient but also well-suited for a variety of high-accuracy,high-resolution spectral measurement scenarios.

关键词： High-accuracy Resolution enhancement Reconstructive spectrometer Mode division multiplexing Photonics lantern

Spectral programmable mid-infrared optical parametric oscillator

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Photonics Research 2024年第8期12卷 1593-1603页

作者： JUNRUI LIANG jiangming xu YANZHAO KE SICHENG LI JUNHONG HE YIDONG GUO YANG ZHANG XIAOYA MA JUN YE XIAO LI JINYONG LENG PU ZHOU College of Advanced Disciplinary 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

A spectral programmable,continuous-wave mid-infrared(MIR)optical parametric oscillator(OPO),enabled by a self-developed high-power spectral tailorable fiber laser,was proposed and *** operating at a singlewavelength,the maximum idler power reached 5.53 W at 3028 nm,with a corresponding pump-to-idler conversion efficiency of 14.7%.The wavelength number switchable output was available from one to *** single idler was tunable in a range of 528 nm(2852–3380 nm).In a dual-wavelength operation,the interval between two idlers could be flexibly tuned for 470 nm(53–523 nm),and the intensity of each channel was *** idler emission was realized,meanwhile exhibiting spectral custom-tailored ***,we balanced the parametric gain through the pre-modulating broadband multi-peak pump spectra,enabling a 10 d B bandwidth adjustment of the idler emission from 20 to 125 *** versatile mid-infrared laser,simultaneously featuring wide tuning,multi-wavelength operation,and broad bandwidth manipulation,has great application potential in composition detection,terahertz generation,and speckle-free imaging.

关键词： pump tuning parametric

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

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基于随机光纤激光器的多奇点涡旋光束

光学学报 2024年第10期44卷 393-403页

作者：马小雅叶俊梁峻锐何俊鸿张扬许将明周朴姜宗福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

部分相干结构光束具有抗湍流闪烁和抑制散斑等特性,在大气传输和成像等领域具有广泛的应用潜力。提出并展示了基于随机光纤激光器产生的部分相干多奇点涡旋光束。对不同拓扑荷数涡旋光束的相干叠加进行仿真研究,发现叠加过程可产生具有... 详细信息

部分相干结构光束具有抗湍流闪烁和抑制散斑等特性,在大气传输和成像等领域具有广泛的应用潜力。提出并展示了基于随机光纤激光器产生的部分相干多奇点涡旋光束。对不同拓扑荷数涡旋光束的相干叠加进行仿真研究,发现叠加过程可产生具有多个奇点的复杂相位分布。采用中心波长为1081.3 nm的随机光纤激光器作为照明光源,通过搭建空间干涉环路实现多奇点涡旋光束的产生。奇点数目可通过改变参与干涉的涡旋拓扑荷数来实现灵活调控。该工作有望为多粒子控制、涡旋光通信、光学计算和成像等领域提供重要参考。

关键词：激光器随机光纤激光器多奇点涡旋涡旋叠加奇点可控部分相干

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大频移范围光纤拉曼增益谱的测量

红外与激光工程 2024年第5期53卷 143-150页

作者：张扬何俊鸿柯延钊郭艺东梁峻锐马小雅叶俊许将明冷进勇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

光纤拉曼增益谱的测量对光纤激光器的设计与优化至关重要。当前光纤拉曼增益谱的测量主要是基于小信号增益法,但该方法测试时间较长,且可测量的频移范围受限于信号源的波长调谐范围,难以获得光纤在大频移范围内的拉曼增益谱。为此,提出... 详细信息

光纤拉曼增益谱的测量对光纤激光器的设计与优化至关重要。当前光纤拉曼增益谱的测量主要是基于小信号增益法,但该方法测试时间较长,且可测量的频移范围受限于信号源的波长调谐范围,难以获得光纤在大频移范围内的拉曼增益谱。为此,提出了一种利用光纤的自发拉曼散射谱来反演光纤在大频移范围内拉曼增益谱的方法。利用该方法测量了两款光纤——掺磷光纤与掺锗光纤在1~42 THz频移范围内的拉曼增益谱。在1.6~22 THz频移范围内,基于该方法测得的拉曼增益系数与基于小信号增益法测得的结果基本一致。该工作为测量光纤在大频移范围内的拉曼增益谱提供了一种解决方案。

关键词：拉曼光纤激光器拉曼增益谱测量自发拉曼散射掺磷光纤

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

High power linearly polarized fiber laser：Generation, manipulation and application

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Science China(Technological Sciences) 2017年第12期60卷 1784-1800页

作者： ZHOU Pu HUANG Long xu jiangming MA PengFei SU RongTao WU Jian LIU ZeJin College of Optoelectronic Science and Engineering National University of Defense Technology Changsha 410073 China

Linearly-polarized(LP) fiber lasers, which could find wide potential applications such as coherent detection, coherent/spectral beam combining, nonlinear frequency conversion, have been a research focus in recent years. In this paper, we will present a general review on the achievements of various kinds of high power LP fiber laser and its applications for the first time. The recent progress in high power LP fiber oscillator, including fiber oscillator based on active fiber, Raman fiber laser and Random distributed feedback fiber laser are summarized. Power scaling of LP fiber laser by using active-fiber based power amplifier, passive-fiber based Raman amplifier, and active/passive fiber based hybrid fiber amplifier has been achieved. Polarization-maintained active fiber based power amplifier and non-polarization-maintained active fiber based power amplifier incorporating active polarization control are specially introduced in detail. High power LP fiber laser with diversified property, such as narrow-linewidth, wavelength-tunable and ultrashort pulse operation, are summarized. Various kinds application of high power LP fiber laser, including beam combining,supercontinumm generation, mid-infrared lasing, structured light field and ultrasonic generation, are presented at the end of this paper.

关键词： linear polarized fiber laser high power raman fiber laser polarization control pulsed fiber laser

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