单脉冲锁模光纤激光器输出特性的数值研究

发布时间：2018-01-09 23:28

本文关键词：单脉冲锁模光纤激光器输出特性的数值研究　出处：《激光技术》2017年06期 　论文类型：期刊论文

【摘要】：为了研究不同腔内净色散下单脉冲被动锁模光纤激光器的输出特性,采用以非线性薛定谔方程为数学模型和分步傅里叶的方法,对激光脉冲在腔内的演化进行了理论分析。获得了在保持单脉冲稳定输出时激光器一些参量与腔内净色散的变化关系,并针对净色散为正的情况,对输出脉冲进行了腔外解啁啾压缩,压缩比达到10倍以上,分析了压缩所需的负色散值以及压缩后脉宽的情况。结果表明,小信号增益系数最大值与净腔色散大体上成正比关系,且当小信号增益系数达到最大值时,输出脉冲的脉宽以及相应的时间带宽积呈现逐渐增加的趋势,3d B带宽则呈现出先增加后减少的趋势。该研究结果为优化被动锁模光纤激光器提供了参考。
[Abstract]:In order to study the output characteristics of order pulse passive mode-locked fiber laser with different net dispersion in cavity, the nonlinear Schrodinger equation is used as the mathematical model and the discrete step Fourier method is used. The evolution of laser pulses in the cavity is analyzed theoretically. The relationship between the laser parameters and the net dispersion in the cavity is obtained when the single pulse output is kept stable, and the net dispersion is positive. The output pulse is dechirped and the compression ratio is more than 10 times. The negative dispersion and the pulse width after compression are analyzed. The maximum gain coefficient of small signal is proportional to the net cavity dispersion, and when the gain coefficient of small signal reaches the maximum, the pulse width and the corresponding time bandwidth product of the output pulse gradually increase. The 3D B bandwidth increases first and then decreases. The results provide a reference for the optimization of passive mode-locked fiber lasers.
【作者单位】：北京化工大学理学院物理系;
【基金】：北京市自然科学基金资助项目(4122055)
【分类号】：TN248.35
【正文快照】： 引言近年来,超短脉冲在一些重要领域得到了广泛的应用和研究,如超快诊断、生物工程、超连续谱产生以及光学测量等[1-2]。为了获得超短脉冲,通常有调Q[3]和锁模[4]两种方法,相较于调Q技术,锁模技术能获得脉宽更窄、功率更高的超短脉冲。自20世纪60年代实现激光锁模以来,锁模光

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