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arXiv 2202.13621physics.optics
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非线性和非厄米趋肤效应引起的反常单模激光

Anomalous single-mode lasing induced by nonlinearity and the non-Hermitian skin effect

B. F. Zhu, Q. Wang, D. Leykam, H. R. Xue, Q. J. Wang, Y. D. Chong

摘要:

单模工作对于高泵浦功率下工作的激光器来说是一种理想但难以实现的特性。典型地,单模激射接近阈值是可达到的,但是增加泵浦功率由于模间增益竞争而引起多个激射峰值。我们提出了一种具有相反行为的激光器:多模激射发生在低输出功率下,但泵浦超过一定值会产生单一激射模式,所有其他候选模式都经历负有效增益。这种行为出现在具有非微调非对称耦合的耦合光学谐振器的晶格中,并且是由非线性增益饱和和非厄米趋肤效应之间的相互作用引起的。在频域和时域模拟中观察到单模激射。它对现场无序是鲁棒的,并且可以扩展到大的晶格尺寸。这一发现可能有助于实现高功率激光器阵列。

英文摘要:

Single-mode operation is a desirable but elusive property for lasers operating at high pump powers. Typically, single-mode lasing is attainable close to threshold, but increasing the pump power gives rise to multiple lasing peaks due to inter-modal gain competition. We propose a laser with the opposite behavior: multi-mode lasing occurs at low output powers, but pumping beyond a certain value produces a single lasing mode, with all other candidate modes experiencing negative effective gain. This behavior arises in a lattice of coupled optical resonators with non-fine-tuned asymmetric couplings, and is caused by an interaction between nonlinear gain saturation and the non-Hermitian skin effect. The single-mode lasing is observed in both frequency domain and time domain simulations. It is robust against on-site disorder, and scales up to large lattice sizes. This finding might be useful for implementing high-power laser arrays.

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