共查询到19条相似文献,搜索用时 46 毫秒
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主被动锁模光纤激光器的脉宽计算及其稳定性分析 总被引:1,自引:0,他引:1
分析了主被动锁模光纤环形孤子激光器的运行机理,用分裂步长法进行了数值模拟,获得了重复频率为10GHz,脉宽为985fs的稳定的孤子脉冲序列,通过孤子参量演化方程的求解,获得了光结环形孤子激光器的稳定运行条件及孤子脉宽的解析表达式。 相似文献
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利用锁模光纤激光器在色散位移光纤中产生超连续谱的研究 总被引:2,自引:0,他引:2
采用主动锁模光纤激光器输出的重复频率10GHz、脉宽7.97ps的脉冲作为抽运光源,无需压缩后直接抽运4.2km的普通色散位移光纤(DSF).利用色散位移光纤中自相位调制、交叉相位调制等非线性效应的联合作用,获得了20dB带宽达125nm、覆盖整个C波段、L波段和部分S波段的超连续(SC)谱。实验研究了抽运光脉冲峰值功率和抽运波长对超连续谱宽度的影响,结果表明抽运光脉冲峰值功率越高,得到的超连续谱的带宽越宽;通过对抽运波长的优化,可以实现最大程度的超连续展宽;分析了滤波器带宽对脉冲质量的影响;利用0.4nm带宽的可调谐滤波器对从超连续谱中滤出脉冲的特性进行了研究,在超连续谱的不同波长处获得了脉宽为8.90~9.80ps、时间一带宽积为0.44~0.49的稳定的窄光脉冲。 相似文献
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100W全光纤化高重频窄脉宽光纤激光器 总被引:2,自引:0,他引:2
报道了一种基于主振荡功率放大结构工作的全光纤化高重复频率窄脉冲宽度光纤激光器.种子源是一个直接电脉冲调制的1 063 nm光纤耦合输出半导体激光器.为了抑制放大器中产生的放大自发辐射光,将种子激光的脉冲波形调制为二阶超高斯型.峰值功率为950 mW的半导体激光器经过2级大模场掺镱双包层光纤放大器(纤芯分别为10μm和30μm)功率放大后,最终获得了平均功率为101 W、重复频率为200 kHz、脉冲宽度为14.77 ns、峰值功率为34.2 kW、3 dB光谱宽度为0.261 nm、光束质量M~2为1.17的脉冲激光输出.与传统的纳秒级脉冲光纤激光器相比,该激光器峰值功率高、光束质量优、光谱宽度窄、结构简单,可广泛应用于激光雷达、遥感探测、倍频和光参量震荡等领域. 相似文献
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近年来,双重复频率锁模激光器在诸如双光梳光谱和异步光学采样等应用领域吸引了广泛关注.基于单一激光腔的双梳系统能大大降低成本,简化系统结构,且性能优异.双重复频率锁模激光器为发展紧凑型和实用型双梳装置开辟了道路.本文报道了一种可用作双光梳光谱系统光源的双重复频率锁模Yb:YAG陶瓷激光器.该激光器基于半导体可饱和吸收镜锁模技术,采用双通道抽运结构,利用新型非水基流延成型制备的Yb:YAG透明陶瓷,在单一的五镜腔中,当吸收抽运光功率为5.6 W时,实现了自启动、稳定运转的双重复频率锁模脉冲Pulse1和Pulse2,其重复频率分别为448.918和448.923 MHz,重复频率差为5 kHz.在吸收抽运功率为7 W时,得到最大的总平均输出功率170 mW,其中Pulse1和Pulse2的功率分别为89和81 mW,相应的光谱宽度分别为1和1.16 nm.性能相似的双重复频率脉冲彼此间保持了良好的相干性,实验结果证明了双通道抽运在双重复频率锁模激光器应用中的可行性,此种新型双重复频率激光器在双光梳光谱和测距等领域具有较好的应用潜力. 相似文献
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介绍一种多波长掺铥主动锁模光纤激光器,增益介质为长2 m的掺铥光纤,主动锁模通过铌酸锂强度调制器实现。腔内加入基于双折射的光学滤波器,利用保偏光纤双折射滤波效应在滤除腔内多余超模噪声的同时,还可以实现多波长输出。基频下的锁模脉冲频谱信噪比可达68.48 dB,在稳定的锁模状态下波长信道数最大为5。此外,腔内偏振无关隔离器被替换为偏振相关隔离器后,将锁模脉冲加载数字信号同步调制,测得的眼图光信噪比提高了8.67 dB。测试结果表明,锁模脉冲的时间稳定性得到有效提升。 相似文献
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We report direct generation of <500-fs pulses at a 1-GHz rate from a self-starting passively mode-locked fiber laser by regeneratively synchronizing the pulses with a phase modulator. The pulses are amplified and passed through a dispersion-decreasing fiber and a normal-dispersion supercontinuum fiber. The resulting continuum is wider than 350 nm. 相似文献
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We demonstrate generation of supercontinuum pulses directly from a passively mode-locked long-cavity fiber ring laser. The laser output exhibited a blueshifted spectrum extending from 1350 to 1550 nm with an average output power greater than 60 mW. 相似文献
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利用非线性光环形镜(NOLM)的可饱和吸收特性实现了可自启动的2 m全光纤高能量被动锁模掺铥光纤激光器。当泵浦功率大于3 W时,激光器工作在连续或不稳定脉冲运转状态;泵浦功率达到4.69 W后,输出为自启动锁模脉冲,重复频率4.26 MHz,中心波长2 061.5 nm,光谱半极大宽度18.1 nm,平均输出功率8.8 mW;继续增加泵浦功率到最大值7.56 W,可以得到中心波长2 062.2 nm、光谱半极大宽度17.1 nm、斜率效率为6.2%、脉冲宽度和能量分别为424 fs和65.6 nJ的稳定锁模脉冲。这是目前已报道的在未经放大情况下脉冲能量最高的2 m锁模脉冲光纤激光器。 相似文献
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High power supercontinuum generation with 70 W average output power in a nonlinear ytterbium-doped fiber amplifier is demonstrated using all-normal dispersion, all-fiber master oscillator power amplifier configuration. The supercontinuum covers from 1064 nm to beyond 1700 nm with spectral flatness better than 12 dB and 67.3% optical to optical conversion efficiency. The almost uniform spectral power density across the whole continuum is more than 70 mW/nm and the nanosecond bursts output have an effective peak power of 82.7 kW. 相似文献
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All-polarization-maintaining, self-starting Erbium-doped fiber laser based on graphene-saturable absorber is presented. Scalar soliton pulses with 570 fs duration and 114.1 MHz repetition rate were achieved at a 1557 nm center wavelength and with 6 nm bandwidth. The graphene-saturable absorber was formed by mechanical exfoliation of pure graphite. The laser was environmentally stable and could operate for long periods of time with linearly polarized output and degree of polarization at the level of 98%. 相似文献
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S. Martin-Lopez M. Gonzalez-Herraez P. Corredera A. Carrasco 《Optics Communications》2006,267(1):193-196
We describe the effect of temperature variations on supercontinuum (SC) generation in optical fibers using a continuous-wave (CW) Raman fiber laser as a pump. We achieve supercontinuum generation by pumping only ∼2 W of power into a 7 km-long nonzero dispersion-shifted fiber (NZDSF) in the region of small anomalous dispersion. In these conditions, the supercontinuum builds up basically on modulational instability and Raman. At room temperature, the supercontinuum covers effectively the S, C and L transmission bands defined by the International Telecommunication Union (ITU). Temperature tuning of the fiber environment provides a means of tuning the fiber dispersion, and thus a means of changing the width and shape of the supercontinuum spectrum. We demonstrate a 27% increase in the 10-dB SC width. We believe that the application of this new tuning mechanism to other experimental configurations using pulsed sources might be used to produce extremely broad supercontinuums. 相似文献
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An environmentally stable mode-locked fiber laser based on nonlinear polarization rotation is experimentally demonstrated. The laser is based on a novel laser configuration that has negligible low-power steady-state reflectivity from one side and, consequently, no CW gain. The laser is self starting and the configuration is implementable as an all-fiber laser with standard polarization-maintaining fiber-pigtailed components. A pulse duration of 5.6 ps is obtained at a repetition rate of 5.96 MHz and at an average power of 8 mW. As an application of the proposed laser configuration, 213 mW of supercontinuum (600-1750 nm) was demonstrated from a fiber laser system with no sections of free-space optics. 相似文献
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A high pulse energy passively mode-locked fiber laser operating in the all-normal dispersion regime is demonstrated. The gain material is an Yb-doped multicore photonic crystal fiber with 18 cores in array-type geometry. Robust and self-starting mode locking is achieved using a fast semiconductor saturable absorber mirror. The laser generates 180?nJ chirped pulses at a 14.48?MHz repetition rate for an average power of 2.6?W. The 1.15?ps output pulses are compressed to 690?fs outside the cavity. 相似文献