Title :
High-temperature distributed feedback quantum cascade lasers with wide tuning range wavelength
Author :
Wei, Lin ; Li, Yao-yao ; Li, Ai-zhen ; Xu, Gang-Yi ; Zhang, Yong-gang
Author_Institution :
State Key Lab. of Functional Mater. for Inf., Chinese Acad. of Sci., Shanghai, China
fDate :
Oct. 30 2008-Nov. 2 2008
Abstract :
In this paper, high performance of distributed feedback quantum cascade lasers operation at 7.7 ¿m and 8.4 ¿m have been investigated. With a broad gain spectrum, the DFB QCLs employing different grating periods exhibit a wavelength span of 0.17 ¿m at room temperature and total wavelength coverage of 0.33 ¿m at various heatsink temperatures. For the 8.4 ¿m DFB-QCLs with a high side mode suppression ratio of about 30 dB, a low threshold current density of 1.73 kA/cm2 at 300 K and a high operating temperature of 420 K are achieved in pulsed mode. The DFB-QCLs emission at 7.7 ¿m have been successfully used in N2O absorption line detection.
Keywords :
current density; diffraction gratings; distributed feedback lasers; gas sensors; nitrogen compounds; quantum cascade lasers; DFB-QCL; N2O; absorption line detection; gain spectrum; grating periods; heatsink temperatures; high-temperature distributed feedback quantum cascade lasers; operating temperature; pulsed mode; side mode suppression ratio; temperature 293 K to 298 K; threshold current density; total wavelength coverage; wavelength 7.7 mum; wavelength 8.4 mum; Distributed feedback devices; Electromagnetic wave absorption; Gratings; Infrared detectors; Laser modes; Laser tuning; Pulse measurements; Quantum cascade lasers; Temperature; Threshold current;
Conference_Titel :
Optical Fiber Communication & Optoelectronic Exposition & Conference, 2008. AOE 2008. Asia
Conference_Location :
Shanghai
Print_ISBN :
978-1-55752-863-6
Electronic_ISBN :
978-1-55752-863-6
