Investigation of spectral gain narrowing in quantum cascade lasers using terahertz time domain spectroscopy
Investigation of spectral gain narrowing in quantum cascade lasers using terahertz time domain spectroscopy
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DOI：
10.1063/1.2979682
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发表时间：
2008-09-08
影响因子：
4
通讯作者：
Marcadet, X.
中科院分区：
文献类型：
--
作者：
Jukam, N.;Dhillon, S. S.;Marcadet, X.
The spectral gain of bound-to-continuum terahertz quantum cascade lasers (QCLs) is measured as a function of current density using terahertz time-domain spectroscopy. During lasing action the full width at half maximum (FWHM) of the gain is found to monotonically decrease with increasing current density until lasing action stops at which point the FWHM reaches a minimum (0.22 THz for a laser operating at 2.1 THz). Band structure calculations show that the spectral gain narrowing is due to the alignment and misalignment of the injector with the active region as a function of the applied bias field. (c) 2008 American Institute of Physics.
