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Article Dans Une Revue Applied Physics Letters Année : 2008

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

Résumé

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 (0.22THz for a laser operating at 2.1THz). Bandstructure 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.
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Dates et versions

hal-00288345 , version 1 (16-06-2008)

Identifiants

  • HAL Id : hal-00288345 , version 1

Citer

Nathan Jukam, Sukhdeep Dhillon, Dimitri Oustinov, Zhen-Yu Zhao, Sophie Hameau, et al.. Investigation of spectral gain narrowing in quantum cascade lasers using terahertz time domain spectroscopy. Applied Physics Letters, 2008, 93, pp.101115. ⟨hal-00288345⟩
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