期刊
APPLIED PHYSICS LETTERS
卷 113, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5049384
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资金
- Austrian FWF [W1210, W1243]
- SFB project NextLite [F4902]
- Austrian GMe
- SNF [200020-165639]
- H2020 European Research Council Consolidator Grant [CHIC 724344]
- SFB project DIPQCL [P30709]
- Austrian Science Fund (FWF) [W1210, W1243] Funding Source: Austrian Science Fund (FWF)
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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