Investigation of spectral gain narrowing in quantum cascade lasers using terahertz time domain spectroscopy

被引：44

作者：

Jukam, N. ^{[1
]}

Dhillon, S. S. ^{[1
]}

Oustinov, D. ^{[1
]}

Zhao, Z. -Y. ^{[1
]}

Hameau, S. ^{[1
]}

Tignon, J. ^{[1
]}

Barbieri, S. ^{[2
]}

Vasanelli, A. ^{[2
]}

Filloux, P. ^{[2
]}

Sirtori, C. ^{[2
]}

Marcadet, X. ^{[3
]}

机构：

[1] Ecole Normale Super, Lab Pierre Aigrain, F-75231 Paris 05, France

[2] Univ Paris 07, F-75251 Paris 05, France

[3] Thales Res & Technol, F-91404 Orsay, France

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 10期

关键词：

D O I：

10.1063/1.2979682

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：3

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