DocumentCode :
2780288
Title :
Distributed feedback ring resonators for vertically emitting terahertz quantum cascade lasers
Author :
Mahler, Lukas ; Tredicucci, Alessandro ; Beltram, Fabio ; Amanti, Maria I. ; Walther, Christoph ; Faist, Jéròme ; Beere, Harvey E. ; Ritchie, David A.
Author_Institution :
NEST CNR-INFM, Scuola Normale Superiore, Pisa, Italy
fYear :
2009
fDate :
14-19 June 2009
Firstpage :
1
Lastpage :
1
Abstract :
In this paper, we have modeled and fabricated THz QCLs in a circular double-metal DFB resonator of much larger diameter, for which we compute the far-field shown in the inset. Devices are designed using a finite element solver. A second order grating with a double slit configuration was found to offer the best compromise between electrical and optical properties of the top electrode. Even without collection optics employed, the devices show peak power up to 10 mW, with a slope efficiency of ~25mW/A, demonstrating the good radiative efficiency of this resonator and directionality of the emitted power. We observe single-mode emission with a side-mode suppression of more than 20 dB. We believe the current work will further simplify the integration of THz QCLs into possible applications.
Keywords :
diffraction gratings; distributed feedback lasers; laser cavity resonators; quantum cascade lasers; submillimetre wave lasers; DFB resonator; THz QCL fabrication; distributed feedback ring resonators; double slit configuration; finite element solver; optical properties; radiative efficiency; second-order grating; side-mode suppression; vertically emitting terahertz quantum cascade laser; Distributed feedback devices; Electrodes; Finite element methods; Gratings; Optical devices; Optical feedback; Optical resonators; Optical ring resonators; Quantum cascade lasers; Stimulated emission;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-4079-5
Electronic_ISBN :
978-1-4244-4080-1
Type :
conf
DOI :
10.1109/CLEOE-EQEC.2009.5191788
Filename :
5191788
Link To Document :
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