共查询到19条相似文献,搜索用时 343 毫秒
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设计了以石墨烯作为可饱和吸收体的被动调Q掺钕钇铝石榴石晶体(Nd∶YAG)微片激光器。该激光器采用三明治结构,附有石墨烯薄层的YAG晶体紧密压贴于工作物质Nd∶YAG晶体上,晶体端面镀膜作为端面镜构成平行平面谐振腔。采用光纤耦合输出激光二极管端面抽运技术,利用石墨烯的可饱和吸收作用,在注入功率为1.17W时实现微片激光器的调Q运转,获得波长1064.6nm,重复频率300~807kHz可调,最小脉冲宽度75ns的激光输出。激光器最大输出功率38.4mW,最大单脉冲能量54.7nJ。 相似文献
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基于石墨烯被动调Q Nd:YAG晶体微片激光器 总被引:1,自引:0,他引:1
设计了以石墨烯作为可饱和吸收体的被动调Q掺钕钇铝石榴石晶体(Nd:YAG)微片激光器。该激光器采用三明治结构,附有石墨烯薄层的YAG晶体紧密压贴于工作物质Nd:YAG晶体上,晶体端面镀膜作为端面镜构成平行平面谐振腔。采用光纤耦合输出激光二极管端面抽运技术,利用石墨烯的可饱和吸收作用,在注入功率为1.17 W时实现微片激光器的调Q运转,获得波长1064.6 nm,重复频率300~807 kHz可调,最小脉冲宽度75 ns的激光输出。激光器最大输出功率38.4 mW,最大单脉冲能量54.7 nJ。 相似文献
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卤化物钙钛矿独特的物理结构和电子结构,使其表现出了明显优于传统半导体材料的非线性光学性能。本文报道了氧化石墨烯与钙钛矿复合材料(GO&CH3NH3PbI3)作为可饱和吸收体(SA)在被动调Q激光器中的应用。实验表明,氧化石墨烯的超快电荷传输特性和钙钛矿的强电荷产生效率可以结合在一起。GO&CH3NH3PbI3复合材料表现出更强的饱和吸收性能。将GO&CH3NH3PbI3 SA插入Nd∶YVO4全固态被动调Q激光器谐振腔内,实现了1064nm调Q脉冲的输出。当抽运功率增加到65W时,激光器平均输出功率为350mW。此时,激光器输出的调Q脉冲宽度为340ns,重复频率为1773kHz,射频信号信噪比为46dB。 相似文献
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调Q双包层光纤激光器研究新进展 总被引:1,自引:0,他引:1
综述了近几年来在高能量输出(毫焦)、高重复频率(千赫兹)、纳秒级脉冲输出的调Q光纤双包层光纤激光器研究的最新进展,包括饱和吸收体和受激布里渊散射被动调Q、声光和电光主动调Q等,并分析各自的特点。最后讨论了国内外调Q双包层光纤激光器的研究现状和发展前景 相似文献
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为了实现锁模光纤激光器的波长可调谐, 采用半导体可饱和吸收镜(SESAM), 搭建了环形腔被动锁模掺镱光纤激光器。在腔内无偏振控制器及可调谐滤波器等器件的前提下, 通过改变光纤跳线端面至SESAM的距离, 实现光谱在1029.5nm~1042.7nm之间的稳定可调谐, 基频重复频率为18.0MHz, 脉冲宽度为130ps, 锁模脉冲信噪比达44dB。结果表明, 该锁模光纤激光器具有较高的信噪比及较宽的可调谐范围。该研究为可调谐被动锁模光纤激光器的研制提供了重要的参考价值。 相似文献
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为了研究基于半导体可饱和吸收镜的被动锁模光纤激光器的输出特性,采用1480nm的半导体激光器作为抽运源,利用掺铒光纤作为增益介质,以及光纤环行器、偏振控制器、波分复用器和耦合器等构成了环形腔结构的被动锁模光纤激光器。实验中获得了峰值波长1586nm、光谱宽度4.8nm、重复频率11.2MHz、最大平均输出功率8.4mW的稳定锁模激光脉冲输出。结果表明,调整光纤偏振控制器会使光纤激光器输出脉冲的时域波形略微发生变化,在实际应用中需要注意偏振态变化对锁模光纤激光器输出脉冲时域特性的影响。这一结果对于半导体可饱和吸收镜在被动锁模光纤激光器中的应用及其特性具有一定帮助。 相似文献
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A recipe is given for an all-semiconductor, optically nonlinear mirror for passive modelocking of neodymium-doped fiber lasers. InGaAs-GaAs quantum wells (QWs) are used for a saturable absorber. It was empirically found that the best modelocked operation occurred when QWs had a heavy-hole excitonic absorption peak at a wavelength about 10-20 nm longer than the lasing wavelength. An AlAs-GaAs quarter-wavelength stack is used for a rear high reflector. Nonlinear mirrors are etched after epitaxial growth so that the lasing wavelength coincides with a reflectance maximum, giving maximum optical modulation. Nonlinear mirrors are implanted with large doses (2/spl times/10/sup 15//cm/sup 2/) of hydrogen ions in order to increase electron-hole recombination rates, speed material recovery, increase saturation intensity, and inhibit spontaneous Q-switching. Studies of material growth by molecular beam epitaxy and metal-organic chemical vapor deposition (MOCVD) are reported. Modelocked fiber lasers exhibited a pseudorandom output that was produced by several optical pulses that circulated simultaneously in the fiber. It was found that a very high reflectance mirror is not required for lasing or modelocking. To our knowledge, this is the first report of the use of a nonlinear mirror grown by MOCVD to modelock a neodymium fiber laser. 相似文献
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Masataka NAKAZAWA 《中国光电子学前沿》2010,3(1)
There are many kinds of fiber lasers in the 1.5 μm band using erbium-doped fiber amplifiers. Our group has been studying and developing advanced fiber lasers, such as 1) 10-40 GHz harmonically mode-locked fiber lasers, 2) femtosecond fiber lasers that use single-wall carbon nanotube (CNT)-doped polymers as a saturable absorber, and 3) frequency-stabilized fiber lasers that employ acetylene C2H2. We will describe recent progress on these fiber lasers and their applications in this article. 相似文献
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Tronciu V.Z. Yamada M. Ohno T. Ito S. Kawakami T. Taneya M. 《Quantum Electronics, IEEE Journal of》2003,39(12):1509-1514
Room-temperature operation of self-pulsating InGaN lasers was obtained at a wavelength of 395 nm. The laser structure consists of a multiquantum-well InGaN active layer and a p-type InGaN single-quantum-well saturable absorber. The frequency range of the self-pulsation was from 1.6 to 2.9 GHz. The experimental results were well explained with our theoretical analysis. We found that features of the saturable absorber strongly affect the self-pulsation. Influence of device and material parameters on the laser dynamics was also investigated. 相似文献
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为提高光纤光栅传感器的测量范围和可靠性,本文采用单缝衍射方法实现了栅区长度小于1.5 mm,3 dB带宽大于1 nm,反射谱边缘有效线性区大于0.6 nm的切趾超短光纤光栅。并用其作为传感单元,提出了一种利用超短光纤光栅线性区域的中心波长解调方法。为了充分利用其反射光谱左右两侧的线性区,采用双波长激光的互补解调方法,将波长解调范围扩展到2.4 nm。实验结果表明,光功率与中心波长之间的线性度达到0.992。将测量值与实际值进行比较,两者具有较好的一致性.该方法具有结构简单、功耗小,测量空间分辨率高等潜在优势。 相似文献