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arXiv 2012.05288physics.optics
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强耦合辅助的激光阈值以下相干辐射的形成

Strong-coupling-assisted formation of coherent radiation below the lasing threshold

Ilya V. Doronin, Alexander A. Zyablovsky, Evgeny S. Andrianov

摘要:

创建在相干阈值以上操作的纳米级激光器是一个具有挑战性的问题。我们提出了一种方法来规避这个问题,使用系统,其中实现了强耦合制度之间的光和活性介质。在强耦合区,腔中的电磁场与原子之间发生能量振荡。通过对泵浦施加适当的时间调制,可以控制这些能量振荡,使得激光系统中的相干性出现在激光阈值以下。我们表明,在这种方法中,辐射线宽是两个数量级小于传统的激光器的线宽相同的光子数。此外,在系统达到正的粒子数反转之前,输出辐射的二阶相干函数由二阶相干函数降为一阶相干函数。我们的研究结果为创建可以在激光阈值以下工作的纳米级相干辐射源铺平了道路。

英文摘要:

The creation of nanoscale lasers that operate above a coherent threshold is a challenging problem. We propose a way to circumvent this issue using systems in which a strong coupling regime is achieved between the light and the active medium. In the strong coupling regime, energy oscillations take place between the EM field in the cavity and the atoms. By applying appropriate time modulation to the pumping, it is possible to control these energy oscillations in such a way that coherence in the laser system appears below the lasing threshold. We show that in this approach, the radiation linewidth is two orders of magnitude smaller than the linewidth of a conventional laser for the same photon number. In addition, the second order coherence function of the output radiation is reduced from two to one before the system reaches a positive population inversion. Our results pave the way for the creation of nanoscale sources of coherent radiation that can operate below the lasing threshold.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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