共查询到20条相似文献,搜索用时 46 毫秒
1.
Sensitizer-free holmium-doped silica and fluoride mid-infrared fiber lasers are pumped using a high-power diode laser operating at 1148 nm. A maximum output power of 162 mW at 2.86 microm was produced at a slope efficiency of 24% using Ho(3+), Pr(3+)-doped fluoride fiber. Using Ho(3+)-doped silica fiber, a maximum output power of 55 mW at 2.1 microm was generated at a slope efficiency of 27%, a value limited by the presence of pump excited state absorption. 相似文献
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The diode laser (LD) clad-pumped 1947.6 nm continuous wave (CW) Tm3+-doped fiber amplifier is reported using the master oscillation power amplifier (MOPA) method. The injected seed laser is
provided by an all-fiber LD-clad-pumped Tm3+-doped single-mode fiber laser, which has a nearly 2.4 W maximal output power and 0.1 nm ultra-narrow linewidth based on the
intracore reflection FBG. Using the 25/400 μm double-clad LMA Tm3+-doped fiber as the gain fiber, the output maximal output power is 30.6 W from the fiber amplifier, with a slope efficiency
of 39.1% respected to the LD total output power. A high power multi-mode fiber combiner is used to couple high power LD light
into the gain fiber. The output wavelength is also located at 1947.6 nm, with the slightly expanded laser linewidth of 0.2
nm. 相似文献
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A high-power 83 W cladding-pumped Tm3+-Ho3+-doped silica fiber laser is reported. Using bidirectional 793 nm diode pumping, a maximum slope efficiency of 42% was produced after a threshold launched pump power of 12 W was exceeded. The laser operated at wavelengths near 2105 nm with moderate beam quality, i.e., M2 approximately 1.5. Further power scaling of the fiber laser was limited by thermal failure of the fiber ends. 相似文献
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Diode pumping of a continuous-wave Pr3+-doped LiYF4 laser 总被引:1,自引:0,他引:1
We report, for the first time to our knowledge, diode-pumped cw laser oscillation of Pr3+:LiYF4 in the red spectral range. The pump power is provided by a GaN laser diode emitting a maximum output power of 25 mW at a wavelength of approximately 442 nm. The Pr3+ laser emits 1.8 mW of output power at a 639.7-nm wavelength. Threshold pump power and slope efficiency in a nonoptimized setup are determined to be 5.5 mW and 24%, respectively. 相似文献
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A novel all fiber cavity Yb3+-doped double-clad fiber laser (DCFL) based on two double-clad fiber (DCF)Bragg grating is presented. The fiber Bragg gratings (FBGs) as the input and output mirrors have been formed in Yb3+-doped DCF with the phase-mask method, and their reflectivities are 99% and 22%,respectively. When the input pump power is 417 mW, the maximum output power is 144 mW with linewidth <0.1 nm at the wavelength of 1.057μm, over 40-dB signal-to-noise ratio (SNR), and 50.8% slope efficiency. 相似文献
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Laser emission in the range of 1.88-1.99 micrim from a Tm3+ -doped tellurite fiber is demonstrated when pumped with a diode-pumped Er3+/Yb3+-doped silica fiber laser operating at 1.57-1.61 microm. This pump source excites the Tm3+ ions directly into the F43 upper laser level and yields an output power of 280 mW with a slope efficiency of 76% in a 99%-12% laser cavity arrangement and a 32 cm long fiber. This result is very close to the Stokes efficiency limit of approximately 80%. This is, to the authors' knowledge, the first demonstration of high efficiency lasing in a tellurite fiber at wavelengths longer than 1.56 microm. 相似文献
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为了实现2.1 μm波段光纤激光器输出多波长激光,设计了一种基于光纤Sagnac干涉仪的可调谐多波长掺钬光纤激光器。采用1.9 μm波段掺铥光纤激光器泵浦一段长3 m的掺钬石英光纤,获得2.1 μm波段的光放大;环形腔中,由保偏光纤和偏振控制器构成的光纤Sagnac干涉仪,实现2.1 μm波段周期滤波,获得了2.1 μm波段多波长激光,输出功率1 mW~15 mW可调谐,最多可观测到6个波长的激光输出。通过调节环形腔内偏振控制器,能够实现2.1 μm波段1~6个波长的调谐。 相似文献
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The top-hat beam clad-pumped Tm3+-doped fiber laser was realized simply using an intracavity multi-mode abrupt taper. The ratio of the flat-top diameter to
the spot diameter reaches 53%, with a small intensity variation less than 6%, and the top-hat beam’s half-divergence angle
is only 5.3°. The fiber laser has a maximal output power of 5 W with slope efficiency of 39.7%, pumped by the 792 nm diode
laser (LD). The abrupt taper is directly made on the multi-mode double-clad Tm3+-doped fiber near the fiber laser output end with the 0.45 ratio of taper waist diameter to fiber clad diameter, and this
fiber end 4% Fresnel reflection is used to be the output coupler. The fiber laser’s high reflective coupler is an intracore
multi-mode FBG, which is directly written into the multi-mode Tm3+-doped fiber core using femtosecond laser and phase mask, at the other fiber end. The abrupt taper has no obviously influence
on the fiber laser output power, and the output laser spectrum. 相似文献
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We demonstrate high-power operation from a singly Ho3+-doped silica fiber laser that is cladding pumped directly with diode lasers operating at 1150 nm. Internal slope efficiencies approaching the Stokes limit were produced, and the maximum output power was 2.2W. This result was achieved using a low Ho3+-ion concentration and La3+-ion codoping, which together limit the transfer of energy between excited Ho3+ ions. 相似文献
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The CW 25.6 W output power with a slope efficiency of 30.6% respected to the pump power from a CW single transverse mode all-fiber
Tm3+-doped Silica Fiber Laser is reported. The all-fiber laser is made up by progressively splicing the pigtail fiber, matched
FBG fiber and Tm fiber. The reflective FBG and Tm3+-doped fiber end Fresnel reflection build up the laser resonance cavity. Due to the multi-mode FBG as the reflective mirror,
the output laser spectrum is multi-peaks at high output power, but the spectrum width is less than 2 nm at 1.94 μm. We estimate
the beam quality to be M
2 = 2.39, clearly indicating nearly diffraction-limited beam propagation. 相似文献
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The basic performance characteristics of a Ho 3+-doped silica fibre laser that operates in a single transverse mode at ~2.1 µm and is pumped with the 1100-nm output from a free-running Yb 3+-doped silica fibre laser are presented. We measure a maximum slope efficiency (with respect to launched pump power) of 35% and we generate a maximum output power of 2.7 W at an optical-to-optical efficiency of 18% with respect to the incident pump power. The wavelength of the output is length tuned from 2090 nm to 2100 nm when the a absL product varies from 1.2 to 2.7. The use of the free-running output from a Yb 3+-doped silica fibre laser to pump the Ho 3+-doped silica fibre laser is very convenient and allows significant scaling of the output power. 相似文献
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对掺钕光纤激光器输出功率沿光纤的分布以及不同光纤长度下抽运功率和输出功率沿光纤的分布进行了数值模拟.以808nm半导体激光器为抽运源,掺钕双包层保偏光纤为增益介质,对保偏光纤激光器进行了探索性的实验研究.分别就光纤不同弯曲形状和弯曲半径对激光器输出功率指标和偏振特性的影响进行了研究,实验中发现在1060nm和1092nm处有两个峰值.在波长1060nm处得到了7.35W的连续偏振激光输出,斜率效率为58.3%.
关键词:
激光技术
光纤激光器
掺钕保偏光纤
偏振 相似文献
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双包层光纤光栅选频双包层光纤激光器 总被引:7,自引:2,他引:5
双包层光纤激光器中多采用法布里珀罗(F-P)线形腔结构,谐振腔为一只二向色镜和光纤端面菲涅耳反射镜(反射率约为4%)构成,这属于一种有缺陷的腔结构,其稳定性不好,产生激光的波长很难得到有效控制,后腔镜不能精确选择激光器的输出波长,激光器的输出谱线较宽。在某些对激光波长有明确要求的应用中,该结构会受到限制。采用布拉格光纤光栅作腔镜,利用其窄带滤波特性,可以得到窄线宽的激光输出,目前报道的作为腔镜的布拉格光纤光栅为在单包层光敏光纤上制作而成,然后分别将不同反射率的光纤光栅与双包层增益光纤熔接,这给腔镜与双包层光纤之间带来很大的耦合损耗,影响了激光器的功率输出。该文报道了用相位掩模法在双包层光纤芯上写入了布拉格光纤光栅,并把此光纤光栅做为后腔镜.对长度为10m、20m的D形掺Yb^3 双包层光纤激光器进行实验研究,在1058nm附近得到稳定的窄线宽激光输出,3dB带宽为0.329nm。激光器最大输出功率为570mW。最后对实验结果进行了理论分析。 相似文献