Open AccessEmission spectra of terahertz quantum-cascade lasers based on the terahertz quantum-well photodetectors
Author(s) -
Zhongxin Tan,
Guo Xu-Guang,
Juncheng Cao,
Hua Li,
Yu Han
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.2391
Subject(s) - terahertz radiation , laser , lasing threshold , optoelectronics , photomixing , terahertz time domain spectroscopy , quantum cascade laser , far infrared laser , photodetector , optics , materials science , terahertz spectroscopy and technology , detector , spectral line , physics , terahertz metamaterials , astronomy
The emission of a 41 THz quantum cascade laser (THz QCL) has been measured by a spectrally-matching terahertz quantum-well photodetector (THz QWP). The measured emission spectra have been analyzed with respect to the spectral shape and peak position. The relative light power of the laser under different drive currents have been estimated from the emission spectra and then the lasing domain and threshold current density of the laser has been determined. The temperature-dependent response of THz QWP to the laser has also been investigated. The analyzed results indicate that the THz QWPs could be a good detector for characterizing the emission properties of the THz QCLs and may be the receivers in the terahertz communications.