Dispersion in a broadband terahertz quantum cascade laser
Dispersion in a broadband terahertz quantum cascade laser
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DOI：
10.1063/1.4969065
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发表时间：
2016-12
影响因子：
4
通讯作者：
D. Bachmann;M. Rösch;G. Scalari;M. Beck;J. Faist;K. Unterrainer;J. Darmo
中科院分区：
文献类型：
--
作者：
D. Bachmann;M. Rösch;G. Scalari;M. Beck;J. Faist;K. Unterrainer;J. Darmo
我们展示了具有异质活性区域的宽带太赫兹量子级联激光器的色散数据。提取整个激光腔的群速度色散（包括有源区、半导体材料和波导的贡献）的实验方法依赖于时域光谱系统。获得的群速度色散曲线在 2.0 和 3.0 THz 之间表现出振幅高达 1 × 105 fs2/mm 的振荡，并且强烈依赖于激光器的驱动条件。这表明群速度色散主要由有源区的子带间增益决定。将获得的色散数据与基于多个 Drude-Lorentz 增益介质的色散模型进行比较，产生显着的相关性。
We present dispersion data of a broadband terahertz quantum cascade laser with a heterogeneous active region. The experimental method to extract the group velocity dispersion of the entire laser cavity, including the contributions of the active region, the semiconductor material, and the waveguide relies on a time-domain spectroscopy system. The obtained group velocity dispersion curves exhibit oscillations with amplitudes up to 1 × 105 fs2/mm between 2.0 and 3.0 THz and strongly depend on the driving conditions of the laser. This indicates that the group velocity dispersion is mainly determined by the intersubband gain in the active region. The obtained dispersion data are compared to a dispersion model based on multiple Drude-Lorentz gain media yielding a significant correlation.