Wen Zengrun, Gao Song, Wang Weiming, Wang Kaile, Cai Yangjian, Gao Yuanmei
Opt Lett. 2022 Jul 15;47(14):3443-3446. doi: 10.1364/OL.464199.
We study the pulse characteristics in a laser mode-locked by active modulators with non-Hermitian driven signals. The signal assembles a parity-time ( ) symmetric and an anti-parity-time ( ) symmetric function with fundamental and harmonic frequencies, respectively, inducing the complex coupling between modes in the frequency domain. A one-dimensional synthetic lattice is used to analyze the spectral mode coupling. By enlarging the weight and harmonic order of the part of the signal, the optical spectrum can be adjusted from redshift to blueshift. Simultaneously, the pulse duration and spectral width are shortened and broadened, respectively. The work explores the role of non-Hermitian modulation in the mode-locked laser area.
我们研究了由具有非厄米驱动信号的有源调制器锁模的激光器中的脉冲特性。该信号分别由具有基频和谐波频率的奇偶时间（ ）对称函数和反奇偶时间（ ）对称函数组成，在频域中诱导模式之间的复耦合。使用一维合成晶格来分析光谱模式耦合。通过增大信号 部分的权重和谐波阶数，可以将光谱从红移调整为蓝移。同时，脉冲持续时间和光谱宽度分别缩短和展宽。这项工作探索了非厄米调制在锁模激光领域中的作用。
