Self-starting harmonic comb emission in THz quantum cascade lasers
Self-starting harmonic comb emission in THz quantum cascade lasers
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DOI：
10.1063/5.0041339
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发表时间：
2021-03-29
影响因子：
4
通讯作者：
Scalari, Giacomo
中科院分区：
文献类型：
--
作者：
Forrer, Andres;Wang, Yongrui;Scalari, Giacomo
谐波梳状态已被证明在中红外量子级联激光器中普遍存在。本文报道了铜基双金属太赫兹量子级联激光器的稳定、纯、自启动谐波锁模。根据泵浦条件的不同，在同一腔中可以激发出不同的谐波，并在80 K下获得了频率超过600 GHz的稳定谐波梳。这样的设备可以被RF注入，并且通过在50 GHz下执行的自混合技术来评估自由运行的相干性。一个理论模型的基础上麦克斯韦-布洛赫方程，包括在增益分布的不对称性被用来解释的数据。
Harmonic comb states have proven to be ubiquitous in mid-IR quantum cascade lasers. We report here on robust, pure, self-starting harmonic mode locking in Copper-based double-metal THz quantum cascade lasers. Different harmonic orders can be excited in the same laser cavity depending on the pumping condition, and stable harmonic combs spanning more than 600GHz at 80K are reported. Such devices can be RF injected, and the free running coherence is assessed by means of a self-mixing technique performed at 50GHz. A theoretical model based on Maxwell-Bloch equations including an asymmetry in the gain profile is used to interpret the data.