Gain dynamics in a heterogeneous terahertz quantum cascade laser

被引：23
|
作者：
Derntl, C. G. [1 ]
Scalari, G. [2 ]
Bachmann, D. [1 ,4 ]
Beck, M. [2 ]
Faist, J. [2 ]
Unterrainer, K. [1 ,3 ]
Darmo, J. [1 ]
机构：
[1] TU Wien, Photon Inst, Campus Gusshaus, A-1040 Vienna, Austria
[2] Swiss Fed Inst Technol, Inst Quantum Elect, Auguste Piccard Hof 1, CH-8093 Zurich, Switzerland
[3] TU Wien, Ctr Micro & Nanostruct, Campus Gusshaus, A-1040 Vienna, Austria
[4] Crystalline Mirror Solut GmbH, Vienna, Austria
来源：
APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 18期
基金：
欧盟地平线“2020”; 奥地利科学基金会;
关键词：
SPECTROSCOPY; DISPERSION;
D O I：
10.1063/1.5049384
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The gain recovery time of a heterogeneous active region terahertz quantum cascade laser is studied by terahertz-pump-terahertz-probe spectroscopy. The investigated active region, which is based on a bound-to-continuum optical transition with an optical phonon assisted extraction, exhibits a gain recovery time in the range of 34-50 ps dependent on the operation condition of the laser. The recovery time gets shorter for stronger pumping of the laser while the recovery dynamics slows down with increasing operation temperature. These results indicate the important role of the intracavity light intensity for the fast gain recovery. (C) 2018 Author(s).
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页数：5
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