TITLE

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

AUTHOR(S)
Jukam, N.; Dhillon, S. S.; Oustinov, D.; Zhao, Z.-Y.; Hameau, S.; Tignon, J.; Barbieri, S.; Vasanelli, A.; Filloux, P.; Sirtori, C.; Marcadet, X.
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p101115
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
34449545

 

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