DocumentCode :
2737795
Title :
Room Temperature, Low Threshold Distributed Feedback Quantum Cascade Lasers at 7.7 μm
Author :
Xu, Gangyi ; Li, Aizhen ; Li, Yaoyao ; Wei, Lin ; Lin, Chun ; Zhang, Yonggang ; Li, Hua
Author_Institution :
CAS, Shanghai
fYear :
2006
fDate :
18-22 Sept. 2006
Firstpage :
215
Lastpage :
215
Abstract :
In this paper, we present low threshold DFB QCLs (λ ≡ 7.7 μm) with top grating by innovating the waveguide structure and the method of grating fabrication. Highly doped InP cladding layer was taken as the host layer for the grating, and was anisotropically etched along [O-11] direction with the lateral etching being negligible. This method releases the limitation on the grating depth. By careful design and control a deep first-order grating, with a thin highly doped InP layer beneath it, was formed in the plasmon enhanced cladding layers. The deep grating ensures strong feedback effect and the thin highly doped InP layer separates the high loss metals in the groove of the grating from the active region, suppressing the increase of the waveguide loss. It allows the fabrication of DFB QCLs with low threshold current density.
Keywords :
distributed feedback lasers; quantum cascade lasers; grating fabrication; low threshold distributed feedback quantum cascade lasers; plasmon enhanced cladding layers; waveguide structure; wavelength 7.7 micron; Anisotropic magnetoresistance; Distributed feedback devices; Etching; Gratings; Indium phosphide; Optical device fabrication; Plasmons; Quantum cascade lasers; Temperature; Threshold current;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006. IRMMW-THz 2006. Joint 31st International Conference on
Conference_Location :
Shanghai
Print_ISBN :
1-4244-0399-5
Electronic_ISBN :
1-4244-0400-2
Type :
conf
DOI :
10.1109/ICIMW.2006.368423
Filename :
4222157
Link To Document :
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