Title :
Low divergence, single-lobed, surface emission from THz photonic-crystal quantum cascade lasers
Author :
Chassagneux, Y. ; Colombelli, R. ; Maineult, W. ; Barbieri, S. ; Khanna, S.P. ; Linfield, E.H. ; Davies, A.G.
Author_Institution :
Inst. d´´Electron. Fondamentale, Univ. Paris Sud, Orsay, France
Abstract :
We demonstrate full control of the spectral and spatial emission properties of terahertz quantum cascade lasers using metallic photonic-crystals for lateral confinement. Single-mode, surface-emission is obtained at a frequency of 2.8-2.9 THz using a photonic-crystal design with a square lattice geometry. The resonator quality factor is then optimised, using a graded photonic-crystal architecture, and this leads to an increased maximum operating temperature of 151 K. Furthermore, the introduction of a carefully designed pi-shift yields single-lobed surface emission (~12deg times 8deg), with a peak output power of 5 mW at 78 K.
Keywords :
laser beams; laser cavity resonators; laser modes; photonic crystals; quantum cascade lasers; submillimetre wave lasers; surface emitting lasers; THz laser; frequency 2.8 THz to 2.9 THz; lateral confinement; metallic photonic-crystal; photonic-crystal laser; pi-shift; power 5 mW; quantum cascade laser; resonator quality factor; single-lobed surface emission; spatial emission; spectral emission; square lattice geometry; temperature 78 K; terahertz laser; Design optimization; Frequency; Geometrical optics; Lattices; Optical control; Power generation; Q factor; Quantum cascade lasers; Surface emitting lasers; Temperature; 140.5965 (Semiconductor lasers, quantum cascade); 140.7270 (Vertical emitting lasers); 230.5298 (Photonic crystals);
Conference_Titel :
Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-55752-869-8
Electronic_ISBN :
978-1-55752-869-8
