共查询到18条相似文献,搜索用时 125 毫秒
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采用改进的化学气相沉积法和气相液相混合掺杂技术制备大芯径掺镱石英光纤预制棒, 以此作为有源纤芯制备了纤芯直径约90 μm的掺镱双包层光子晶体光纤, 纤芯组分为镱铝磷共掺.双包层光子晶体光纤的模场面积约1330 μm2, 纤芯数值孔径0.065,包层数值孔径0.5.首次实现了国产掺镱光子晶体光纤的高功率高效率激光输出, 1 m长的光子晶体光纤激光器实现102 W 激光输出,斜率效率76%. 相似文献
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采用改进化学汽相沉积结合溶液掺杂法制备了Yb/P/Al共掺的石英光纤预制棒,通过光纤芯层的组份和制备工艺的优化,实现了Yb3+的高浓度掺杂和均匀掺杂.预制棒芯层Yb2O3掺杂浓度达到~4wt.%,Yb3+在1 080 nm处荧光寿命为1 780μs.成功拉制出内包层截面形状为八边形的双包层光纤,纤芯直径为7.5 μm,包层吸收系数达到~5 dB/m@976 nm.利用拉制的掺镱双包层光纤开展了全光纤结构的掺镱光纤激光器性能测试实验,实现了5.15W的激光输出,斜率效率达到76%. 相似文献
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实验研究了掺镱双包层保偏大模面积光子晶体光纤飞秒激光放大器. 获得了平均功率达16W的飞秒激光放大输出,在50MHz重复频率下,对应的单脉冲能量达到320nJ. 增益光纤长3.5m,由于自相位调制效应,种子光脉冲光谱在放大过程中同时展宽,从而支持更窄的脉冲宽度. 经过光栅后,脉冲宽度压缩到了85fs. 系统中的振荡器和放大器基于同一种具有偏振结构的大模面积光子晶体光纤,具有很好的环境稳定性和进一步集成的可能.
关键词:
光子晶体光纤
大模场面积光纤
飞秒激光
光纤放大器 相似文献
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高保偏聚合物光子晶体光纤的化学制备技术研究 总被引:14,自引:8,他引:6
研究了大尺寸高保偏聚合物光子晶体光纤(polymer Photonic Crystal Fibers,pPCFs)预制棒的化学原位制备技术.采用预聚物浇铸后加热聚合方法,成功制备了具有高保偏性能的光纤预制棒, 给出了聚合反应的最佳条件.对此预制棒进行二次拉伸及光学和化学性质的测试表明,该方法得到的预制棒力学结构稳定、光学透明度高,且拉伸所得光纤微结构保持完好、微孔坍塌率低、非固有损耗小.若在聚合反应体系中加入适量的激光染料或其它稀土有机螯合物等物质,可得到具有荧光性的高保偏聚合物光子晶体光纤预制棒,为保偏型聚合物光子晶体光纤激光器的研制提供新材料. 相似文献
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采用粉末烧结技术制备出高浓度镱铝共掺石英棒,Yb3+掺杂浓度为12 000ppm(wt).利用此掺镱石英棒作为纤芯,拉制出镱铝共掺大模场光子晶体光纤,光纤模场面积为550μm2,模场直径26μm.实验结果表明:光纤在近红外波段(850~1 033nm)出现一个宽的吸收带,主吸收峰波长位于976nm,在此波长处吸收损耗高于10dB/m;采用波长为971nm的激光泵浦光纤,在1 050~1 125nm波长范围内产生高斯型的荧光峰,峰值波长位于1 088nm处,荧光半宽高45nm. 相似文献
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We report a linearly polarized Tm doped fiber laser. The fiber laser was set up by using a piece of polarization maintaining
Tm doped double clad fiber of 5 m length as gain medium and a polarization beam splitter as a polarization selector. The fiber
laser was pumped by a fiber pigtailed laser diode working at 790 nm with a maximum output power of 90 W. The linearly polarized
Tm laser operated at wavelength around 2030 nm. A maximum output power up to 21.9 W was achieved when the pump power was 63.27
W with a threshold of 11.92 W, a slope efficiency of about 43.7%, and a polarization extinction ratio of 92.7% (11.37 dB).
In addition to the blue fluorescence, we also observed the violet fluorescence under high pump power level. The up-conversion
fluorescence was considered to be attributed to the 1
G
4 → 3
H
6, and 1
D
2 → 3
F
4 transitions of Tm ions, respectively. 相似文献
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We reported a 26 W linearly polarized single-mode Yb-doped photonic crystal fiber amplifier, working at 80 kHz repetition
rate with 4.5 ns duration, corresponding 72 kW peak power. Using a acousto-optic Q-switched Nd:YVO4 laser as the seed source, the 26 W average power of 1064 nm laser was obtained at a repetition rate of 80 kHz from a Yb-doped
photonic crystal fiber amplifier, with 4.5 ns duration, polarization extinction ratio 11 dB and M
2 < 1.2. 相似文献
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为了获得高功率高效率3 m~5 m中红外激光输出,利用双声光调Q晶体,通过高重复频率驱动调Q同步技术和LD侧面泵浦双棒串接技术,获得高功率高光束质量1.06 m激光双端输出,外置起偏器获得4束激光输出,利用波片偏振旋光原理,实现4束偏振态一致的激光输出,泵浦非线性晶体PPLT进行频率变换,实现高功率3 m~5 m中红外激光输出。在电源输入电流30 A、调Q驱动频率10 kHz的条件下,获得最高功率10.6 W的3.9 m中红外激光,1.06 m~3.9 m转化效率为9.5%。实验结果表明:通过双声光调Q技术和LD侧面泵浦双棒串接技术,可以实现4束高重复频率窄脉宽1.06 m偏振激光输出,泵浦PPLT可获得高功率3.9 m中红外激光输出。 相似文献
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A high efficient LD (laser diode) pumped Tm3+ doped double clad silica fiber laser with an intravacity biconical taper was reported. A biconical taper located ~3 cm from the output end of the fiber laser was fabricated by heating and stretching method with a length 1.5 cm and waist diameter ~20 µm. The slope efficiency was 49.8% with respected to the launched pump power, and the maximum output power was 1.97 W. Pre and post output laser power ratio was ~10. This fiber laser was compared with other three biconical tapered fiber lasers (the same fiber with different tapers) and a uniform geometry fiber laser. With intracavity biconical tapers, fiber lasers’ thresholds were ~1 W higher than the fiber laser without the taper (1.97 W). The pump end’s slope efficiencies of fiber lasers with tapers were 3–5% in contrast with 37.6% of the uniform one. After tapered, the pre and post laser power ratios were much higher than the un-tapered one’s, but not changed much with the launched pump power. 相似文献
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Z. Librant J.K. Jabczyński H. W?glarz A. Wajler H. Tomaszewski T. ?ukasiewicz W. ?endzian J. Kwiatkowski 《Opto-Electronics Review》2009,17(1):72-77
Transparent Nd:YAG ceramics were produced by solid.state reaction of high.purity (4N) nanometric oxides powders, i.e., Al2O3, Y2O3 and Nd2O3. After sintering, mean grain sizes of 2% Nd:YAG samples were about 20 μm and their transparency were a bit worse than that
of 0.9% Nd:YAG single crystal. Two types of active elements: rods and slabs were fabricated and characterized in several diode
pumping schemes. In end pumping configuration as a pump source 20.W fiber coupled laser diode operating in low duty cycle
regime (1 ms pump duration/20 Hz) was deployed. In the best case, 3.7 W of output power for 18 W of absorbed pump power, M2 < 1.4 were demonstrated for uncoated ceramics Nd:YAG rod of ϕ 4×3mm size in preliminary experiments. For the ceramics of
two times lower Nd dopant level above 30% slope efficiency was achieved. In case of Nd:YAG ceramic slab side pumped by 600.W
laser diode stack above 12 W was demonstrated with slope efficiency of 3.5%. 相似文献
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A high stability all-fiber LD-clad-pumped Tm3+-doped fiber laser was reported. The fiber laser had the ultra-narrow linewidth 50 pm at 1.948 μm with the maximal output
power of 12.8 W. The slope efficiency was 28.9%, and threshold was 5.7 W. The double-clad Tm3+-doped fiber core was multi-mode, which had a demission of 25/250 μm with the core NA of 0.1 and inner-clad NA of 0.46. The
high reflectivity coupler FBG was directly written into the single-mode passive photosensitive optical fiber core, which had
a core diameter of 15 μm and NA of 0.1. The cavity was build-up by the high reflectivity FBG and the output fiber end Fresnel
reflectivity. 相似文献
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USHA CHAKRAVARTY ANTONY KURUVILLA RAJPAL SINGH B N UPADHYAY K S BINDRA S M OAK 《Pramana》2014,82(2):379-383
In this paper we report linearly polarized high average power passive Q-switched ytterbium-doped photonic crystal fibre laser with a Cr4+:YAG crystal as a saturable absorber. An average output power of 9.4 W with pulse duration of 64 ns and pulse repetition rate of 57.4 kHz with a slope efficiency of 52% was achieved. Measured polarization extinction ratio (PER) of the Q-switched laser output was 10.5 dB. 相似文献