共查询到20条相似文献,搜索用时 171 毫秒
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设计了一种与高功率超短脉冲激光放大过程中获得的总增益、增益介质的带宽、激光带宽、脉冲中心波长等参数相关的调制函数,对激光放大过程中的光谱增益窄化进行补偿。此调制函数的优越性在于,对不同性能的激光系统,无需改变调制函数的形式就能适用。通过数值模拟的方法,讨论了在不同增益介质带宽、激光带宽、脉冲中心波长下的补偿效果。此调制函数在高功率超短脉冲激光系统中有良好的应用前景。 相似文献
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高功率脉冲在大模场掺Yb3+光纤中的自相似传输放大特性 总被引:1,自引:1,他引:0
分析了高功率脉冲在增益光纤中传输放大时非线性薛定谔方程的自相似解,得出注入光的脉宽和能量满足一定关系时,优化增益光纤的长度,才能满足种子光脉冲在增益光纤中的自相似传输放大.揭示了高功率种子光脉冲在光纤中自相似演化的特征参量.此外,模拟了注入能量为400 pJ,脉宽为200 fs,波形分别为正割、高斯以及3阶超高斯的种子光脉冲在纤芯为30μm的大模场增益光纤中的传输放大特性.结果表明3种波形的种子光脉冲的时间波形与光谱均演化为抛物形,时间波形与光谱均发生展宽,但光谱两侧均发生抖动.自相似传输放大后,脉冲为线性啁啾,易于压缩,对实现全光纤高功率超短脉冲产生系统具有重要意义. 相似文献
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光谱的增益窄化是影响超短脉冲宽带放大的关键因素之一.本文利用Nd, Gd:SrF2晶体发射光谱的特点,开展了宽带放大中的光谱增益特性理论和实验的研究.通过数值模拟,详细研究了激光增益介质在不同的光谱增益线型及不同增益倍数下,输出光谱的演化规律. Nd, Gd:SrF2晶体光谱增益窄化特性研究实验结果表明,输入光谱半高宽为5 nm时,在140倍的增益条件下, Nd, Gd:SrF2晶体的输出光谱宽度未见明显窄化,实验结果与理论计算分析相符合.研究结果为氟化物晶体在宽带啁啾脉冲放大的应用奠定了基础. 相似文献
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By using the nonlinear Schrödinger equation model, the inverse problem of the chirp pulse through the Ti:sapphire amplifier was studied, in which the effects of gain narrowing, gain saturation and amplified spontaneous emission on the pulse were considered. The results were useful for the design of the pulse shaping of the ultrashort pulse. 相似文献
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利用掺镱双包层光纤放大器对百皮秒单脉冲(重复频率1 Hz)进行了放大实验,分析了其放大过程中自相位调制对脉冲时域和频域特性的影响.采用小芯径(纤芯直径6.5 μm)掺镱双包层光纤作为增益介质,研究了放大器中从小信号增益到增益深度饱和整个变化过程中自相位调制引起的频谱展宽效应,并分析了SPM引起的脉冲波形和频谱光强分布的变化.采用布喇格光纤光栅扫描方法观察了其光谱的变化,解决了单脉冲光谱不易测量的问题.结果表明:区别于无源光纤中的自相位调制效应,随着抽运功率的增加,百皮秒脉冲放大过程中增益饱和效应和自相位调制效应的共同作用,使脉冲频谱分裂成不对称双峰结构,且光强分布先向短波后逐渐向长波集中. 相似文献
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A.J. Schmidt 《Optics Communications》1975,14(3):287-289
A novel system for generating single tunable ultrashort light pulses of high power is described. The pulse train from a mode-locked flashlamp pumped dye laser passes through an amplifier, which is pumped by an N2 laser. As gain is only available for a few nsec, only one pulse in the train gets amplified. The energy of the resulting single pulse is about 100 μJ. 相似文献
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The amplification of an ultrabroad bandwidth pulse in an Erbium-doped fiber amplifier in the case where the spectral bandwidth of pulse is comparable to the gain bandwidth of the amplifier is investigated. Based on the numerical simulation of a modified nonlinear Schrödinger equation, it is shown that the amplifier limits the efficiency of amplification. However, the limitation can be minimized by choosing the corresponding optimal fiber length for different gain bandwidths. In addition, the effect of gain bandwidth on the amplification of a soliton with initial chirp depends on the sign of the chirp. 相似文献
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Influences of finite gain bandwidth on pulse propagation in parabolic fiber amplifiers with distributed gain profiles 下载免费PDF全文
The evolutions of the pulses propagating in decreasing and increasing gain distributed fiber amplifiers with finite gain bandwidths are investigated by simulations with the nonlinear Schr¨odinger equation. The results show that the parabolic pulse propagations in both the decreasing and the increasing gain amplifiers are restricted by the finite gain bandwidth. For a given input pulse, by choosing a small initial gain coefficient and gain variation rate, the whole gain for the pulse amplification limited by the gain bandwidth may be higher, which is helpful for the enhancement of the output linearly chirped pulse energy. Compared to the decreasing gain distributed fiber amplifier, the increasing gain distributed amplifier may be more conducive to suppress the pulse spectral broadening and increase the critical amplifier length for achieving a larger output linearly chirped pulse energy. 相似文献
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分析了采用栅引入空间色散的超短脉冲放大器对抑制谱带空窄,增益饱和及减少放大的自发辐射等作用,并在实验上采用4f系统的单级染料放大器,获得了大于10^3放大倍率。 相似文献
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Influences of finite gain bandwidth on pulse propagating in parabolic fiber amplifiers with distributed gain profiles 下载免费PDF全文
The evolutions of the pulses propagating in decreasing and increasing gain distributed fiber amplifiers with finite gain bandwidths are investigated by simulating with the nonlinear Schrödinger equation. The results show that the parabolic pulse propagations in both the decreasing and the increasing gain amplifiers are restricted by the finite gain bandwidth. For a given input pulse, by choosing small initial gain coefficient and gain variation rate, the whole gain for the pulse amplification limited by the gain bandwidth may be higher, which is helpful to the enhancement of the output linearly chirped pulse energy. Compared to the decreasing gain distributed fiber amplifier, the increasing gain distributed amplifier may be more conducive to suppress the pulse spectral broadening and increase the critical amplifier length for achieving a larger output linearly chirped pulse energy. 相似文献
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Self-similarity techniques are used to study pulse propagation in a normal-dispersion optical fiber amplifier with an arbitrary longitudinal gain profile. Analysis of the nonlinear Schr?dinger equation that describes such an amplifier leads to an exact solution in the high-power limit that corresponds to a linearly chirped parabolic pulse. The self-similar scaling of the propagating pulse in the amplifier is found to be determined by the functional form of the gain profile, and the solution is confirmed by numerical simulations. The implications for achieving chirp-free pulses after compression of the amplifier output are discussed. 相似文献