Terahertz ambipolar dual-wavelength quantum cascade laser.
Opt Express
; 17(22): 19926-32, 2009 Oct 26.
Article
em En
| MEDLINE
| ID: mdl-19997216
ABSTRACT
Terahertz frequency quantum cascade lasers (THz QCLs) are compact solid-state sources of terahertz radiation that were first demonstrated in 2002. They have a broad range of potential applications ranging from gas sensing and non-destructive testing, through to security and medical imaging, with many polycrystalline compounds having distinct fingerprint spectra in the terahertz frequency range. In this article, we demonstrate an electrically-switchable dual-wavelength THz QCL which will enable spectroscopic information to be obtained within a THz QCL-based imaging system. The device uses the same active region for both emission wavelengths in forward bias, the laser emits at 2.3 THz; in reverse bias, it emits at 4 THz. The corresponding threshold current densities are 490 A/cm(2) and 330 A/cm(2), respectively, with maximum operating temperatures of 98K and 120 K.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Radiação Terahertz
/
Lasers
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article