Gain recovery time in a terahertz quantum cascade laser
Gain recovery time in a terahertz quantum cascade laser
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DOI：
10.1063/1.4942452
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发表时间：
2016-02-22
影响因子：
4
通讯作者：
Dean, Paul
中科院分区：
文献类型：
--
作者：
Bacon, David R.;Freeman, Joshua R.;Dean, Paul
用宽带太赫兹泵浦太赫兹探测光谱测量了工作在1.98太赫兹的束缚到连续频率量子级联激光器的增益恢复时间。恢复时间随着电流密度的增加而减小，当激光接近阈值时，恢复时间达到18ps。我们将这种降低归因于随着有源区的排列，提高了注入器态和上激光能级之间的耦合效率。(C)2016年作者(S)。
The gain recovery time of a bound-to-continuum terahertz frequency quantum cascade laser, operating at 1.98 THz, has been measured using broadband terahertz-pump-terahertz-probe spectroscopy. The recovery time is found to reduce as a function of current density, attaining a value of 18 ps as the laser is brought close to threshold. We attribute this reduction to improved coupling efficiency between the injector state and the upper lasing level as the active region aligns. (C) 2016 Author(s).