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arXiv 1003.2546physics.optics
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微焦耳锁模振荡器:稳定性和噪声问题

Microjoule mode-locked oscillators: issues of stability and noise

Vladimir L. Kalashnikov, Alexander A. Apolonski

摘要:

在这项工作中,第一次,我们的知识,稳定性和噪声的薄圆盘锁模Yb:YAG振荡器工作在负(NDR)和正色散(PDR)制度已系统地分析了在很宽的振荡器参数范围内。发现在NDR中,输出脉冲能量从7 $μ$ J到55 $μ$ J的缩放需要从-0.013 ps $^{2}$到-0.31 ps $^{2}$的色散缩放以提供脉冲稳定性。同时,PDR中从6 $μ$ J到90 $μ$ J的能量缩放需要从0.0023 ps $^{2}$到0.011 ps $^{2}$的适度色散缩放。在PDR中啁啾的皮秒脉冲比在NDR中无啁啾的孤子具有更宽的频谱。因此,啁啾皮秒脉冲可以被压缩到几百飞秒。PDR的一个独特的属性已被发现是一个大大减少的定时抖动。当考虑了PDR的谱特性和谱滤波引起的负反馈时,数值结果与解析理论一致。

英文摘要:

In this work, for the first time to our knowledge, stability and noise of a thin-disk mode-locked Yb:YAG oscillator operating in both negative- (NDR) and positive-dispersion (PDR) regimes have been analyzed systematically within a broad range of oscillator parameters. It is found, that the scaling of output pulse energy from 7 $μ$J up to 55 $μ$J in the NDR requires a dispersion scaling from -0.013 ps$^{2}$ up to -0.31 ps$^{2}$ to provide the pulse stability. Simultaneously, the energy scaling from 6 $μ$J up to 90 $μ$J in the PDR requires a moderate dispersion scaling from 0.0023 ps$^{2}$ up to 0.011 ps$^{2}$. A chirped picosecond pulse in the PDR has a broader spectrum than that of a chirp-free soliton in the NDR. As a result, a chirped picosecond pulse can be compressed down to a few of hundreds of femtoseconds. A unique property of the PDR has been found to be an extremely reduced timing jitter. The numerical results agree with the analytical theory, when spectral properties of the PDR and the negative feedback induced by spectral filtering are taken into account.

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