基于MOPA结构的1120nm掺Yb光纤放大器

基于主振荡功率放大器,采用1120nm光纤激光器作为种子激光,将其注入20m大模场面积单模双包层掺Yb光纤放大器,并用976nm半导体激光器泵浦实现了1 120nm信号光输出.实验中将注入种子激光功率预设为10mW,当半导体激光器泵浦功率增大至1.5 W时,放大器系统开始输出1 120nm信号光.当泵浦功率低于3.4W时,信号光功率随泵浦功率缓慢增长,系统斜率效率较低;而当泵浦功率高于3.4W时,信号光功率随泵浦功率线性增长,斜率效率明显增大,达到48.5%.限于最大注入泵浦功率为6.8W,放大器输出最高1 120nm信号光功率为1.97W,总的光-光转化效率为29%.输出信号光中心波长为1 120.89nm,线宽为0.02nm,极好地保持了种子激光的特性.结合实验情况,利用双包层光纤放大器的稳态理论模型,采用有限差分方法模拟了放大器输出信号光功率随泵浦光功率的变化曲线,结果显示理论模拟所得变化趋势与实验结果吻合良好,系统将在泵浦功率达到200W左右时达到饱和状态,说明目前光纤放大器系统具有很大的功率提升空间.     

光纤光栅F-P标准具选模单频环形腔光纤激光器

 讨论了光纤光栅法布里-珀罗(F-P)标准具选模光纤激光器的单频运转原理，并研制了全光纤结构单频掺Er³⁺光纤环形激光器。实验中采用两个976 nm激光二极管双向泵浦作为泵浦源，高掺杂浓度掺Er³⁺光纤作为增益介质，以行波腔消除空间烧孔效应，利用光纤光栅F-P标准具窄带选模特性，当泵浦光功率为36 mW时，得到了稳定的单频激光输出。实验中使用了长5和3 m的掺杂光纤，在泵浦光功率为145 mW时输出功率分别为19和42 mW，光-光转换效率分别为13%和29%，斜率效率分别达到了16%和33%。输出谱线3 dB带宽0.01 nm，无跳模现象。     

同带抽运高效率光纤放大器

以光纤光栅为谐振腔搭建了波长为1020 nm的光纤激光器,并通过两级级联放大获得了590 mW的最大输出功率. 利用获得的波长为1020 nm的激光进行了波长为1064 nm种子光同带抽运放大,实验研究了不同增益光纤长度时放大器的输出功率和转换效率. 当增益光纤长度为8.5 m时,放大器最大输出功率为385 mW,斜率效率为81%. 进行了波长为976 nm的半导体激光器直接抽运波长为1064 nm种子光的实验. 在增益光纤长度最优时,其斜率效率为56.4%. 实验结果表明,同带抽运方式比传统抽运方式具有更高的转换效率. 研究结果可为波长为1020 nm的激光高功率放大和波长为1064 nm的光纤激光高功率同带抽运放大提供一定的参考. 关键词： 同带抽运 光纤放大器 斜率效率     

掺Yb3+光纤环形激光器研究

报道了采用环形腔结构,使用偏振敏感的光隔离器构成掺Yb3+光纤激光器激光输出特性研究结果.用976 nm半导体激光器作为泵浦激光,获得了2.35 mW的最大输出功率,激光的中心波长为1.0537 μm,泵浦阈值功率为42 mW.在改变腔内偏振控制器的状态时,激光器的输出波长移动到1.066 μm.在时域,实验观测到掺Yb3+环形激光器的自脉动信号输出.     

全光纤结构高功率主振荡功率放大型单频光纤激光器

研制了一台全光纤结构主振荡功率放大型掺镱单频光纤激光器。该光纤激光器包括种子激光器和级联放大器两部分。种子激光器是自行搭建的环形腔结构的单频窄线宽光纤激光器。在976 nm半导体激光器泵浦下,能够输出线宽为10 MHz量级、波长为1 079.88 nm的单频光,激光功率为10.02 W,光-光转化效率为58.9%,斜率效率为65.3%。     

1150nm掺镱光纤激光器输出特性实验研究

以光纤光栅对为激光腔、双包层掺镱光纤为增益介质、976nm半导体激光器为泵浦源,研制全光纤化的1 150nm波段长波光纤激光振荡器.在室温下实现了最大平均输出功率为12.7 W的1 150nm波段单模光纤激光输出,激光振荡器的光光转换效率为42.33%.最大功率输出时,激光中心波长为1 150.48nm,光谱的3dB线宽为0.45nm,边模抑制比达38dB.该研究对研制1 150nm波段高功率光纤激光振荡器具有一定的参考价值.     

紧凑型窄线宽分布反馈光纤激光器

 在铒/镱共掺杂有源光纤上直接刻蚀光栅,制成一台紧凑型非对称π相移分布反馈光纤激光器。光栅总长度约50 mm,最佳相移位置在29 mm处,最佳耦合系数为150 m^-1。采用980 nm激光二极管同向泵浦,当最大泵浦功率为200 mW时,在1 550.94 nm处实现约10 mW激光输出,线宽小于0.05 nm,阈值约35 mW,斜率效率为6.06%,总光 光转换效率为5%,基本满足长距离光通信系统光源功率实用化的要求。     

包层泵浦的铒镱共掺光纤激光高效产生的实验研究

利用尾纤输出的977nm高亮度多模半导体激光器包层泵浦铒镱共掺双包层光纤,采用非球面透镜组耦合方式,使泵浦耦合效率达66%以上,并在法布里-珀罗激光振荡腔结构中实现了高效的连续激光产生,双包层光纤长度为2m,在泵浦入纤功率为1.36W时,输出连续功率最大394mW,斜率效率达35%,激光输出波长1.565μm.     

基于多层石墨烯可饱和吸收体的被动调Q Ho∶YAG激光器

报道了2μm被动调Q的Ho∶YAG激光器,该激光器采用Tm~(3+)光纤激光器作为泵浦源,使用多层石墨烯作为可饱和吸收体。在连续波激光输出模式下,当泵浦功率为4.2 W时,获得了750 mW激光输出,输出激光中心波长为2.09μm,斜率效率为29.6%。在连续波激光器谐振腔中插入多层石墨烯可饱和吸收体并调整谐振腔,获得了脉冲激光输出。当泵浦功率为4.2 W时,获得最小脉冲宽度3.1μs、重复频率66.6 kHz的脉冲激光输出,其最大平均输出功率为170 mW,斜率效率为12.6%,光束质量因子M_x~2=1.15,M_y~2=1.12。     

双包层掺镱光纤激光器连续和调Q运转的实验研究

采用布拉格光纤光栅作为谐振腔,实现了980 nm半导体激光器端面泵浦下的双包层掺镱光纤激光器的连续和调Q运转.连续激光实验结果表明,在泵浦功率固定时,增益光纤存在激光输出功率最大情况下的最佳长度,当泵浦功率增大时,最佳增益光纤长度也随之增加.采用石墨烯分散液作为可饱和吸收体,插入增益光纤与布拉格光纤光栅之间,实现了光纤激光器的稳定被动调Q运转.当泵浦功率为2.87W时,得到了最小脉冲宽度33 ns、重复率38.5 kHz的脉冲序列;随着泵浦功率进一步增大,出现不稳定的调Q锁模现象.     

307 W high-power 1018 nm monolithic tandem pump fiber source with effective thermal management

We report a 307 W 1018 nm Yb-doped fiber laser pumped by a single 976 nm laser diode. The cavity slope efficiency is up to 75.9% and the amplified spontaneous emission is suppressed by 54 dB. The beam quality of the output laser has an M2 factor of 1.17. Effective thermal management is considered to ensure the stable operation of our system. The power stability at the maximum output power level is measured during a period of0.5 h and the power fluctuation is less than 0.8%. This architecture can be an effective high brightness pump source of core-pumping high-power fiber amplifiers.     

大功率掺Yb双包层光纤宽带超荧光光源

利用波长为976nm的半导体激光器抽运掺Yb双包层光纤,制成了大功率光纤宽带超荧光光源,最大超荧光输出功率为54.11mW;此时斜率效率为69．35％,中心波长为1082nm,3dB带宽为17．2nm。     

高重复频率飞秒掺镱光纤放大器

 数值分析了掺镱单模光纤放大器的最佳增益光纤长度，并在实验上对掺镱单模光纤放大器和光栅对压缩器进行了研究。以最大平均输出功率为7 mW、重复频率为25.4 MHz、脉宽为56 ps的被动锁模环形腔掺镱光纤激光器作为种子脉冲，用250 mW的976 nm单模半导体激光器分别泵浦3种不同长度的掺镱单模光纤，对种子光进行放大，并用光栅对压缩器对放大后的脉冲在不同光栅距离上进行了压缩实验研究。当掺镱单模光纤长度为1.2 m时得到了较好的放大效果，种子脉冲被放大到140 mW，相应的增益为13 dB，放大后的单脉冲能量为5.5 nJ。在光栅距离为14.1 cm时获得了最短440 fs的脉冲，压缩后的功率为43 mW，相应的峰值功率为3.8 kW。     

1150 nm High-Power Fiber Laser Oscillator Pumped by 976 nm Laser Diode

We present an all-fiber 1150 nm Yb-doped fiber laser oscillator pumped by a 976 nm laser diode. To suppress amplified spontaneous emission and avoid parasitic laser oscillation, we propose a long-length gain fiber and a high-reflectivity output fiber Bragg grating in the fiber laser oscillator. The 1150 nm band single-mode fiber laser with output power of 20.5 W is demonstrated at room temperature. The optical-to-optical conversion efficiency ranges up to 51.6% at the maximum output. The central wavelength of the fiber laser oscillator is 1150.35 nm, and its 3 dB spectral width is 0.72 nm. No evidence of amplified spontaneous emission, residual pump light, or parasitic laser oscillation were observed in the experiments. The high-power 1150 nm fiber laser oscillator can be used as a pump source in the development of a 3 μm Ho-doped fiber laser.     

Efficient special S-band ytterbium fiber laser emitting at 1012 nm and its application in tandem pumping

We presented the first demonstration of a special S-band Yb-doped fiber laser with a central wavelength of 1012 nm. By pumping common alumosilicate fiber doped with 974 nm laser diode, efficient lasing at 1012 nm was achieved with a maximal output power of 331 mW and 55% power conversion efficiency. We also built a fiber amplifier to validate the feasibility of the 1012 nm laser as the tandem pump source by boosting the 1064 nm C-band laser power up. The slope efficiency of the tandem-pumped fiber amplifier is 63%.     

CONTINUOUS-WAVE LASER OSCILLATION OF Yb:FAP CRYSTALS AT A WAVELENGTH OF 1043nm

A continuous-wave laser oscillation was demonstrated with a Yb-doped fluorapatite (FAP) crystal pumped with a 905 nm Ti:sapphire laser. The output characteristics for different output couplers were investigated. A maximum power of 67mW at a 1043nm wavelength was obtained with 10% output coupler, pumped by a Ti:sapphire laser with 910mW power. This corresponds to a slope efficiency of 26.5%.     

基于光纤光栅谐振腔的掺镱全光纤激光器设计(英文)

采用数值分析方法分析了光纤长度、后腔镜反射率等因素对激光器输出阈值泵浦功率、输出功率的影响,为全光纤激光器的优化设计提供了理论基础.在设计过程中采用光纤光栅作为光纤激光器的反馈与选频腔镜,通过锥度光纤实现了泵浦模块与掺镱双包层光纤之间的低损耗连接以及高效率的泵浦激光功率传输,成功研制了具备稳定窄化线宽激光输出的掺镱全光纤激光器.实验得到了波长峰值在1 082 .50 nm,谱线宽度0 .113 nm,最大输出功率8 .5 W,泵浦阈值功率0 .8 W,斜率效率为70 .8 %的稳定激光输出.     

High-efficiency 1040 and 1078 nm laser emission of a Yb:Y2O3 ceramic laser with 976 nm diode pumping

We report a high-efficiency diode-end-pumped polycrystalline Yb:Y2O3 ceramic laser. Pumped by a 976 nm laser diode bar and with an absorbed pump power of 2.8 W, cw output power of 1.74 W at 1078 nm, and 0.73 W at 1040 nm were obtained. The slope efficiency was measured to be 82.4% for the 1078 nm laser emission and 57.1% for the 1040 nm laser emission.     

Laser-diode-pumped 1319-nm monolithic non-planar ring single-frequency laser

Single-frequency 1319-nm laser was obtained by using a laser-diode-pumped monolithic Nd:YAG crystal with a non-planar ring oscillator (NPRO). When the NPRO laser was pumped by an 800-μm fiber coupled laser diode, the output power of the single-frequency 1319-nm laser was 220 mW, and the slope efficiency was 16%. With a 100-μm fiber coupled diode laser pumped, 99-mW single-frequency 1319-nm laser was obtained with a slope efficiency of 29%.     

A High Efficiency Yb3+-doped Fiber Ring Cavity Laser with Narrow Line-width

A novel Yb3+-doped fiber ring cavity laser pumped by a 977 nm laser diode is presented with its output laser wavelength of 1060 nm. Based on a fiber Bragg grating (FBG), the laser exhibits 0.20 nm line-width, 7.5 mW laser output power, 40 dB signal-to-noise ratio (SNR) and 66% slope efficiency.