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arXiv 1405.7641physics.optics
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可饱和吸收半导体激光器中耦合模的色散诱导动力学

Dispersion-induced dynamics of coupled modes in a semiconductor laser with saturable absorption

Finbarr O'Callaghan, Simon Osborne, Stephen O'Brien

摘要:

本文对一种特殊设计的带有可饱和吸收体的双模半导体法布里-珀罗激光器的模式非线性动力学进行了实验和理论研究。在零偏置施加到吸收体部分,我们已经发现,随着设备电流的增加,单模自脉动演变成一个复杂的动态状态,总强度经历一个恒定的背景上的脉动的定期突发。光谱分辨测量显示,在这种状态下,该设备的各个模式可以遵循高度对称但方向相反的螺旋轨道。使用的速率方程描述的半导体激光器与可饱和吸收的多模情况下,我们表明,这些轨道出现的结果,在激光器的增益和吸收体部分的材料色散之间的相互作用。我们的研究结果提供了深入了解的因素,确定在这些系统中的多模状态的稳定性,他们可以告知定制光谱的半导体锁模激光器的发展。

英文摘要:

We present an experimental and theoretical study of modal nonlinear dynamics in a specially designed dual-mode semiconductor Fabry-Perot laser with a saturable absorber. At zero bias applied to the absorber section, we have found that with increasing device current, single mode self-pulsations evolve into a complex dynamical state where the total intensity experiences regular bursts of pulsations on a constant background. Spectrally resolved measurements reveal that in this state the individual modes of the device can follow highly symmetric but oppositely directed spiralling orbits. Using a generalization of the rate equation description of a semiconductor laser with saturable absorption to the multimode case, we show that these orbits appear as a consequence of the interplay between the material dispersion in the gain and absorber sections of the laser. Our results provide insights into the factors that determine the stability of multimode states in these systems, and they can inform the development of semiconductor mode-locked lasers with tailored spectra.

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